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Filed Pursuant to Rule 424(b)(3)
Registration No. 333-176945

PROSPECTUS

$3,000,000,000

MARATHON PETROLEUM CORPORATION

Offer to Exchange

All outstanding 3 ¹/2% Senior Notes Due 2016 originally issued February 1, 2011

For 3 ¹/2% Senior Notes Due 2016,

All outstanding 5 ¹/8% Senior Notes Due 2021 originally issued February 1, 2011

For 5 ¹/8% Senior Notes Due 2021, and

All outstanding 6 ¹/2% Senior Notes Due 2041 originally issued February 1, 2011

For 6 ¹/2% Senior Notes Due 2041

of

Marathon Petroleum Corporation

This Exchange Offer Will Expire at 5:00 P.M.,

New York City Time, on November 14, 2011

The Exchange Notes

Material Terms of the Exchange Offer

After the exchange offer has been completed, you will not have any further rights under the registration rights agreement to require us to register any outstanding notes that you do not exchange.

Each broker-dealer that receives exchange notes for its own account pursuant to the exchange offer must acknowledge that it will deliver a prospectus in connection with any resale of such exchange notes. The letter of transmittal states that by so acknowledging and by delivering a prospectus, a broker-dealer will not be deemed to admit that it is an “underwriter” within the meaning of the Securities Act of 1933. This prospectus, as it may be amended or supplemented from time to time, may be used by a broker-dealer in connection with resales of exchange notes received in exchange for outstanding notes where such outstanding notes were acquired by such broker-dealer as a result of market-making activities or other trading activities. We have agreed that, starting on the expiration date of the exchange offer and ending on the close of business 180 days after the expiration date, we will make this prospectus, as amended or supplemented, available to any broker-dealer for use in connection with any such resale.

Please consider carefully the “Risk Factors” beginning on page 10 of this prospectus.

Neither the Securities and Exchange Commission nor any state securities commission has approved or disapproved of the exchange notes to be distributed in the exchange offer, nor have any of these organizations determined that this prospectus is accurate or complete. Any representation to the contrary is a criminal offense.

The date of this prospectus is October 7, 2011.

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REFERENCES TO ADDITIONAL INFORMATION

This prospectus incorporates important business and financial information about Marathon Petroleum Corporation that is not included in or delivered with this prospectus. You may obtain documents that are filed by Marathon Petroleum Corporation with the Securities and Exchange Commission, or SEC, and incorporated by reference in this prospectus without charge by requesting the documents, in writing or by telephone, from the SEC or:

Marathon Petroleum Corporation

539 South Main Street

Findlay, Ohio 45840

Attention: Investor Relations

Telephone: (419) 422-2121

If you would like to request copies of these documents, to obtain timely delivery, please do so by November 4, 2011, which is five business days before the exchange offer expires. See “Where You Can Find More Information.”

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MARKET AND INDUSTRY DATA

This prospectus includes estimates of industry data and forecasts that we have obtained from industry publications and surveys or internal company sources. Industry publications and surveys and forecasts generally state that the information contained therein has been obtained from sources believed to be reliable, but there can be no assurance as to the accuracy or completeness of included information. We have neither independently verified any of the data from third-party sources nor ascertained the underlying economic assumptions relied upon therein. Our internal research is based on our understanding of industry conditions, and such information has not been verified by any independent sources.

CAUTIONARY STATEMENT CONCERNING FORWARD-LOOKING STATEMENTS

This prospectus and the documents incorporated by reference include forward-looking statements. You can identify forward-looking statements by words such as “anticipate,” “believe,” “estimate,” “expect,” “forecast,” “goal,” “intend,” “plan,” “predict,” “project,” “seek,” “target,” “could,” “may,” “should” or “would” or other similar expressions that convey the uncertainty of future events or outcomes. When considering these forward-looking statements, you should keep in mind the risk factors and other cautionary statements contained in this prospectus and in the documents incorporated by reference.

Forward-looking statements include, but are not limited to, statements that relate to, or statements that are subject to risks, contingencies or uncertainties that relate to:

We have based our forward-looking statements on our current expectations, estimates and projections about our industry and our company. We caution that these statements are not guarantees of future performance and you should not rely unduly on them, as they involve risks, uncertainties, and assumptions that we cannot predict. In addition, we have based many of these forward-looking statements on assumptions about future events that may prove to be inaccurate. While our management considers these assumptions to be reasonable, they are inherently subject to significant business, economic, competitive, regulatory and other risks, contingencies and uncertainties, most of which are difficult to predict and many of which are beyond our control. Accordingly, our actual results may differ materially from the future performance that we have expressed or forecast in our

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forward-looking statements. Differences between actual results and any future performance suggested in our forward-looking statements could result from a variety of factors, including the following:

We undertake no obligation to update the forward-looking statements included in this prospectus to reflect events or circumstances after the date of this prospectus, unless we are required by applicable securities laws to do so.

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RISK FACTORS

In addition to the other information included or incorporated by reference in this prospectus, including the risk factors included in Part I, Item 1A. “Risk Factors” in our registration statement on Form 10 filed with the SEC on January 25, 2011, as amended, which is incorporated by reference into this prospectus, and other documents filed with the SEC by us, you should carefully consider the following risks before exchanging your outstanding notes. See “Incorporation by Reference” and “Cautionary Statement Concerning Forward-Looking Statements.” Some of these risks relate principally to this exchange offer or our spin-off from Marathon Oil, while others relate principally to our business and the industry in which we operate.

We are subject to certain risks and hazards due to the nature of the business activities we conduct. The risks discussed below, any of which could materially and adversely affect our business, financial condition, cash flows, performance and results of operations, are not the only risks we face. We may experience additional risks and uncertainties not currently known to us; or, as a result of developments occurring in the future, conditions that we currently deem to be immaterial may also materially and adversely affect our business, financial condition, cash flows, performance and results of operations. In any such case, you may lose all or a part of your original investment and not realize any return you may have expected thereon.

Risks Related to this Offering

Changes in our credit ratings may adversely affect the value of the notes.

The ratings assigned to the notes could be lowered, suspended or withdrawn entirely by the rating agencies if, in each rating agency’s judgment, circumstances warrant. Actual or anticipated changes or downgrades in our credit ratings, including any announcement that our ratings are under further review for a downgrade, could affect the market value of the notes.

The indenture does not restrict the amount of additional debt that we may incur.

The notes and the indenture governing the notes do not place any limitation on the amount of unsecured debt that we may incur. Our incurrence of additional debt may have important consequences for you as a holder of the notes, including making it more difficult for us to satisfy our obligations with respect to the notes, a loss in the market value of your notes and a risk that the credit rating of the notes is lowered or withdrawn.

We are a holding company and depend on dividends and other distributions from our respective subsidiaries.

MPC is a holding company with limited direct operations. Our principal assets are the equity interests that we hold in our subsidiaries. As a result, we depend on dividends and other distributions from our subsidiaries to generate the funds necessary to meet our financial obligations, including the payment of principal and interest on our outstanding indebtedness. Our subsidiaries are legally distinct from us and have no obligation to pay amounts due on our indebtedness or to make funds available for such payment. In addition, our subsidiaries will be permitted under the terms of the indenture governing the notes to incur additional indebtedness that may restrict or prohibit the making of distributions, the payment of dividends or the making of loans by such subsidiaries to us. We cannot assure you that the agreements governing the current and future indebtedness of our subsidiaries will permit our subsidiaries to provide us with sufficient dividends, distributions or loans to fund payments on the notes when due.

Neither MPC nor any subsidiary of MPC has any property that has been determined to be a principal property under the indenture.

The indenture governing the notes includes covenants that, among other things, limit our ability and the ability of our subsidiaries to create or permit to exist mortgages and other liens and enter into sale and leaseback

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transactions with respect to principal properties. However, as of the date of this prospectus, neither MPC nor any subsidiary of MPC has any property that MPC’s board of directors has determined to be a principal property under the indenture.

The Marathon Oil guarantees terminated upon completion of the spin-off.

The notes were guaranteed on a senior unsecured basis by Marathon Oil prior to the spin-off. However, the Marathon Oil guarantees terminated upon the completion of the spin-off on June 30, 2011. Concurrently with the termination of the Marathon Oil guarantees, Marathon Oil’s obligations under the registration rights agreement also terminated. Accordingly, in making a decision with respect to exchanging your outstanding notes, you should analyze our business, financial condition, cash flows, performance and results of operations separately from and should not place any reliance on the business, financial condition, cash flows, performance and results of operations of Marathon Oil.

We may not be able to purchase the notes upon a Change of Control Repurchase Event.

Holders of the notes may require us to purchase their notes upon a “change of control repurchase event” as defined under “Description of Notes—Repurchase at the Option of Holders on Certain Changes of Control.” We cannot assure you that we will have sufficient financial resources, or will be able to arrange sufficient financing, to pay the purchase price of the notes, particularly if a change of control event triggers a similar repurchase requirement for, or results in the acceleration of, our other then-existing debt. Our failure to purchase the notes as required under the indenture governing the notes would result in a default under the indenture, which could have material adverse consequences for us and the holders of the notes.

The change of control offer covenant is limited to the transactions specified in “Description of Notes—Repurchase at the Option of Holders on Certain Changes of Control.” We could, in the future, enter into certain transactions, including acquisitions, refinancings or other recapitalizations, that would not constitute a change of control under the notes, but that could increase the amount of indebtedness outstanding at such time or otherwise materially adversely affect our capital structure or credit ratings.

There is currently no market for the exchange notes, and an active trading market may not develop for the exchange notes.

Prior to this exchange offer, there has been no public market for the exchange notes. The exchange notes are a new class of securities that have never been traded. We cannot assure you that an active trading market for the exchange notes will develop or, if one does develop, that it will be sustained. Also, it is possible that the market for the exchange notes will be volatile. This volatility in price may affect your ability to resell your exchange notes or the timing of their sale.

If you do not exchange your outstanding notes, you may have difficulty in transferring them at a later time.

We will issue exchange notes in exchange for the outstanding notes after the exchange agent receives your outstanding notes, the letter of transmittal and all related documents. You should allow adequate time for delivery if you choose to tender your outstanding notes for exchange. Outstanding notes that are not exchanged will remain subject to restrictions on transfer and will not have rights to registration.

If you do participate in the exchange offer for the purpose of participating in the distribution of the exchange notes, you must comply with the registration and prospectus delivery requirements of the Securities Act for any resale transaction. Each broker-dealer who holds outstanding notes for its own account due to market-making or other trading activities and who receives exchange notes for its own account must acknowledge that it will deliver a prospectus in connection with any resale of the exchange notes. If any outstanding notes are not tendered in the exchange or are tendered but not accepted, the trading market for such outstanding notes could be negatively affected due to the limited amount expected to remain outstanding following the completion of the exchange offer.

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Risks Relating to the Spin-Off

We may not realize the potential benefits from the spin-off.

We may not realize the potential benefits that we expect from our spin-off from Marathon Oil. We have described those anticipated benefits elsewhere in this prospectus. See “Summary—The Spin-Off.” See also “The Spin-Off—Reasons for the Spin-Off” in our registration statement on Form 10 filed with the SEC on January 25, 2011, as amended, which is incorporated by reference into this prospectus. In addition, we incurred significant costs, including those described below, which may exceed our estimates, and we may incur some negative effects from our separation from Marathon Oil, including loss of access to the financial, managerial and professional resources from which we have benefited in the past.

Our historical combined, consolidated and pro forma financial information are not necessarily indicative of our future financial condition, future results of operations or future cash flows nor do they reflect what our financial condition, results of operations or cash flows would have been as an independent public company during the periods presented.

The historical combined and consolidated financial information we have included and incorporated by reference in this prospectus does not necessarily reflect what our financial condition, results of operations or cash flows would have been as an independent public company during the periods presented and is not necessarily indicative of our future financial condition, future results of operations or future cash flows. This is primarily a result of the following factors:

The pro forma adjustments are based on available information and assumptions that we believe are reasonable; however, our assumptions may prove not to be accurate. In addition, our unaudited pro forma consolidated financial information does not give effect to the sale of the Northern-Tier Assets and may not give effect to various ongoing additional costs that we may incur in connection with being an independent public company. Accordingly, our unaudited pro forma consolidated financial information does not necessarily reflect what our financial condition, results of operations or cash flows would have been as an independent public company and are not necessarily indicative of our future financial condition or future results of operations. Please refer to “Unaudited Pro Forma Condensed Consolidated Financial Data” and the notes to those statements included in this prospectus, and our historical combined and consolidated financial statements and the notes to those statements included in our registration statement on Form 10 filed with the SEC on January 25, 2011, as amended, and in our Quarterly Report on Form 10-Q for the quarterly period ended June 30, 2011, both of which are incorporated by reference into this prospectus.

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We have no history operating as an independent public company. We incurred significant costs to create the corporate infrastructure necessary to operate as an independent public company, and we will continue to experience increased ongoing costs in connection with being an independent public company.

We have historically used Marathon Oil’s corporate infrastructure to support our business functions, including information technology systems. The expenses related to establishing and maintaining this infrastructure were spread among all of the Marathon Oil businesses. With the completion of the spin-off, we no longer have access to Marathon Oil’s infrastructure, and we have established our own infrastructure, which resulted in the incurrence of significant costs.

Marathon Oil performed many important corporate functions for us, including some information technology, treasury, tax administration, accounting, financial reporting, human resources services, incentive compensation, legal and other services. Prior to the completion of the spin-off, we paid Marathon Oil for many of these services on a cost-allocation basis. Marathon Oil will continue to provide some of these services to us on a transitional basis for a period of up to one year following the completion of the spin-off on June 30, 2011, pursuant to a transition services agreement we have entered into with Marathon Oil. For more information regarding the transition services agreement, see “Relationship with Marathon Oil After the Spin-Off—Agreements Between Marathon Oil and Us—Transition Services Agreement” in our registration statement on Form 10 filed with the SEC on January 25, 2011, as amended, which is incorporated by reference into this prospectus. However, we cannot assure you that all these functions will be successfully executed by Marathon Oil during the transition period or that we will not have to expend significant efforts or costs materially in excess of those estimated in the transition services agreement. Any interruption in these services could have a material adverse effect on our financial condition, results of operation and cash flows. In addition, at the end of this transition period, we will need to perform these functions ourselves or hire third parties to perform these functions on our behalf. The costs associated with performing or outsourcing these functions may exceed the amounts reflected in our historical combined and consolidated financial statements or that we have agreed to pay Marathon Oil during the transition period. A significant increase in the costs of performing or outsourcing these functions could materially and adversely affect our business, financial condition, results of operations and cash flows.

We are subject to continuing contingent liabilities of Marathon Oil.

Although the spin-off has occurred, there are several significant areas where the liabilities of Marathon Oil may become our obligations. For example, under the Internal Revenue Code of 1986, as amended, or the Code, and the related rules and regulations, each corporation that was a member of the Marathon Oil consolidated tax reporting group during any taxable period or portion of any taxable period ending on or before the effective time of the spin-off is jointly and severally liable for the federal income tax liability of the entire Marathon Oil consolidated tax reporting group for that taxable period. In connection with the spin-off, we entered into a tax sharing agreement with Marathon Oil that allocates the responsibility for prior period taxes of the Marathon Oil consolidated tax reporting group between us and Marathon Oil. See “Relationship with Marathon Oil After the Spin-Off—Agreements Between Marathon Oil and Us—Tax Sharing Agreement” in our registration statement on Form 10 filed with the SEC on January 25, 2011, as amended, which is incorporated by reference into this prospectus. However, if Marathon Oil is unable to pay any prior period taxes for which it is responsible, we could be required to pay the entire amount of such taxes. Other provisions of federal law establish similar liability for other matters, including laws governing tax-qualified pension plans as well as other contingent liabilities.

If the spin-off does not qualify as a tax-free transaction, Marathon Oil and its stockholders could be subject to material amounts of taxes and, in certain circumstances, our company could be required to indemnify Marathon Oil for material taxes pursuant to indemnification obligations under the tax sharing agreement.

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Marathon Oil, us and Marathon Oil stockholders for U.S. federal income tax purposes under Sections 355 and 368(a) and related provisions of the Code. If the factual assumptions or representations made in the private letter ruling request are inaccurate or incomplete in any material respect, then Marathon Oil will not be able to rely on the ruling. Furthermore, the IRS does not rule on whether a distribution such as the spin-off satisfies certain requirements necessary to obtain tax-free treatment under Section 355 of the Code. Rather, the private letter ruling was based on representations by Marathon Oil that those requirements have been satisfied, and any inaccuracy in those representations could invalidate the ruling.

The spin-off was also conditioned on Marathon Oil’s receipt of an opinion of Bingham McCutchen LLP, special tax counsel to Marathon Oil (or other nationally recognized tax counsel), in form and substance satisfactory to Marathon Oil, that the distribution of shares of MPC common stock in the spin-off will qualify as tax-free to us, Marathon Oil and Marathon Oil stockholders for U.S. federal income tax purposes under Sections 355 and 368(a) and related provisions of the Code, and that certain internal restructuring transactions in connection with the spin-off generally are and will continue to be tax-free to us, Marathon Oil and other members of the Marathon Oil consolidated tax reporting group. The opinion addressed the principal matters upon which the IRS has not ruled and relied on the private letter ruling as to matters covered by the private letter ruling. The opinion relied on, among other things, the continuing validity of the private letter ruling and various assumptions and representations as to factual matters made by Marathon Oil and us which, if inaccurate or incomplete in any material respect, would jeopardize the conclusions reached by such counsel in the opinion. The opinion is not binding on the IRS or the courts, and there can be no assurance that the IRS or the courts will not challenge the qualification of the spin-off as a transaction under Sections 355 and 368(a) of the Code or that any such challenge would not prevail.

Neither we nor Marathon Oil is aware of any facts or circumstances that would cause the assumptions or representations that were relied on in the private letter ruling or in the opinion of counsel to be inaccurate or incomplete in any material respect. If, notwithstanding receipt of the private letter ruling and opinion of counsel, the spin-off were determined not to qualify under Section 355 of the Code, each U.S. holder of Marathon Oil common stock who received shares of our common stock in the spin-off would generally be treated as having received a taxable distribution of property in an amount equal to the fair market value of the shares of our common stock received. That distribution would be taxable to each such stockholder as a dividend to the extent of Marathon Oil’s current and accumulated earnings and profits. For each such stockholder, any amount that exceeded Marathon Oil’s earnings and profits would be treated first as a non-taxable return of capital to the extent of such stockholder’s tax basis in its shares of Marathon Oil stock with any remaining amount being taxed as a capital gain. Marathon Oil would be subject to tax as if it had sold its shares of common stock of our company in a taxable sale for their fair market value and would recognize taxable gain in an amount equal to the excess of the fair market value of such shares over its tax basis in such shares. See “The Spin-Off—Material U.S. Federal Income Tax Consequences of the Spin-Off” in our registration statement on Form 10 filed with the SEC on January 25, 2011, as amended, which is incorporated by reference into this prospectus.

With respect to taxes and other liabilities that could be imposed on Marathon Oil in connection with the spin-off (and certain related transactions) as a result of a final determination that is inconsistent with the anticipated tax consequences, as set forth in the private letter ruling, under the terms of the tax sharing agreement we have entered into with Marathon Oil, we will be liable to Marathon Oil for any such taxes or liabilities attributable to actions taken by or with respect to us, any of our affiliates, or any person that, after the spin-off, is an affiliate thereof. See “Relationship with Marathon Oil After the Spin-Off—Agreements Between Marathon Oil and Us—Tax Sharing Agreement” in our registration statement on Form 10 filed with the SEC on January 25, 2011, as amended, which is incorporated by reference into this prospectus. We may be similarly liable if we breach specified representations or covenants set forth in the tax sharing agreement. If we are required to indemnify Marathon Oil for taxes incurred as a result of the spin-off (or certain related transactions) being taxable to Marathon Oil, it would have a material adverse effect on our business, financial condition, results of operations and cash flows.

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Potential liabilities associated with certain assumed obligations under the tax sharing agreement cannot be precisely quantified at this time.

Under the tax sharing agreement we entered into with Marathon Oil, following the spin-off we are responsible generally for all taxes attributable to us or any of our subsidiaries, whether accruing before, on or after the spin-off. We also agreed to be responsible for, and indemnify Marathon Oil with respect to, all taxes arising as a result of the spin-off (or certain internal restructuring transactions) failing to qualify as transactions under Sections 368(a) and 355 of the Code for U.S. federal income tax purposes (which could result, for example, from a merger or other transaction involving an acquisition of our stock) to the extent such tax liability arises as a result of any breach of any representation, warranty, covenant or other obligation by us or certain affiliates made in connection with the issuance of the tax opinion or the private letter ruling relating to the spin-off or in the tax sharing agreement. As described above, such tax liability would be calculated as though Marathon Oil (or its affiliate) had sold its shares of common stock of our company in a taxable sale for their fair market value, and Marathon Oil (or its affiliate) would recognize taxable gain in an amount equal to the excess of the fair market value of such shares over its tax basis in such shares. That tax liability could have a material adverse effect on our company. In addition, we agreed to indemnify Marathon Oil for specified tax-related liabilities associated with the 2005 transaction in which we acquired the minority interest in our refining joint venture from Ashland. Our indemnification obligations to Marathon Oil and its subsidiaries, officers and directors are not limited in amount or subject to any cap. If we are required to indemnify Marathon Oil and its subsidiaries and their respective officers and directors under the circumstances set forth in the tax sharing agreement, we may be subject to substantial liabilities. At this time, we cannot precisely quantify the amount of these liabilities that have been assumed pursuant to the tax sharing agreement and there can be no assurances as to their final amounts. See “Relationship with Marathon Oil After the Spin-Off—Agreements Between Marathon Oil and Us—Tax Sharing Agreement” in our registration statement on Form 10 filed with the SEC on January 25, 2011, as amended, which is incorporated by reference into this prospectus.

We may not be able to engage in desirable strategic or capital raising transactions for two years following the spin-off. In addition, under some circumstances, we could be liable for any adverse tax consequences resulting from engaging in significant strategic or capital raising transactions.

Even if the spin-off’s status as a tax-free distribution under Section 355 of the Code is never successfully challenged, the spin-off may result in significant U.S. federal income tax liabilities to Marathon Oil under applicable provisions of the Code if 50% or more of Marathon Oil’s stock or our stock (in each case, by vote or value) is treated as having been acquired, directly or indirectly, by one or more persons as part of a plan (or series of related transactions) that includes the spin-off. Under those provisions, any acquisitions of Marathon Oil stock or our stock (or similar acquisitions), or any understanding, arrangement or substantial negotiations regarding an acquisition of Marathon Oil stock or our stock (or similar acquisitions), within two years before or after the spin-off are subject to special scrutiny. The process for determining whether an acquisition triggering those provisions has occurred is complex, inherently factual and subject to interpretation of the facts and circumstances of a particular case. If a direct or indirect acquisition of Marathon Oil stock or our stock resulted in a change in control as contemplated by those provisions, Marathon Oil (but not its stockholders) would recognize taxable gain. Under the tax sharing agreement, there are restrictions on our ability to take actions that could cause the separation to fail to qualify as a tax-free distribution, and we are required to indemnify Marathon Oil against any such tax liabilities attributable to actions taken by or with respect to us or any of our affiliates, or any person that, after the spin-off, is an affiliate thereof. We may be similarly liable if we breach certain other representations or covenants set forth in the tax sharing agreement. See “Relationship with Marathon Oil After the Spin-Off—Agreements Between Marathon Oil and Us—Tax Sharing Agreement” in our registration statement on Form 10 filed with the SEC on January 25, 2011, as amended, which is incorporated by reference into this prospectus. As a result of the foregoing, we may be unable to engage in strategic or capital raising transactions that our stockholders might consider favorable, or to structure potential transactions in the manner most favorable to us, without adverse tax consequences, if at all.

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Indemnification liabilities to Marathon Oil pursuant to the separation and distribution agreement could materially and adversely affect our business, financial condition, results of operations and cash flows.

In connection with the spin-off, we entered into a separation and distribution agreement with Marathon Oil that provides for, among other things, the principal corporate transactions that were required to effect the spin-off, certain conditions to the spin-off and provisions governing the relationship between our company and Marathon Oil with respect to and resulting from the spin-off. For a description of the separation and distribution agreement, see “Relationship with Marathon Oil After the Spin-Off—Agreements Between Marathon Oil and Us—Separation and Distribution Agreement” in our registration statement on Form 10 filed with the SEC on January 25, 2011, as amended, which is incorporated by reference into this prospectus. Among other things, the separation and distribution agreement provides for indemnification obligations designed to make us financially responsible for substantially all liabilities that may exist relating to our downstream business activities, whether incurred prior to or after the spin-off, as well as those obligations of Marathon Oil assumed by us pursuant to the separation and distribution agreement. If we are required to indemnify Marathon Oil under the circumstances set forth in the separation and distribution agreement, we may be subject to substantial liabilities.

In connection with our separation from Marathon Oil, Marathon Oil will indemnify us for certain liabilities. However, there can be no assurance that the indemnity will be sufficient to insure us against the full amount of such liabilities, or that Marathon Oil’s ability to satisfy its indemnification obligation will not be impaired in the future.

Pursuant to the separation and distribution agreement, Marathon Oil agreed to indemnify us for certain liabilities. However, third parties could seek to hold us responsible for any of the liabilities that Marathon Oil agreed to retain, and there can be no assurance that the indemnity from Marathon Oil will be sufficient to protect us against the full amount of such liabilities, or that Marathon Oil will be able to fully satisfy its indemnification obligations. Moreover, even if we ultimately succeed in recovering from Marathon Oil any amounts for which we are held liable, we may be temporarily required to bear these losses ourselves. If Marathon Oil is unable to satisfy its indemnification obligations, the underlying liabilities could have a material adverse effect on our business, financial condition, results of operations and cash flows.

Additionally, Marathon Oil’s insurers may deny coverage to us for liabilities associated with occurrences prior to the spin-off. Even if we ultimately succeed in recovering from such insurance providers, we may be required to temporarily bear such loss of coverage.

Our accounting and other management systems and resources may not be adequately prepared to meet the financial reporting and other requirements to which we are subject following the spin-off. If we are unable to achieve and maintain effective internal controls, our business, financial condition, results of operations and cash flows could be materially adversely affected.

Our financial results previously were included within the consolidated results of Marathon Oil, and we believe that our reporting and control systems were appropriate for those of subsidiaries of a public company. However, we were not directly subject to the reporting and other requirements of the Exchange Act. As a result of the spin-off, we will be directly subject to reporting and other obligations under the Exchange Act, including the requirements of Section 404 of the Sarbanes-Oxley Act of 2002, which will require, beginning with the filing of our Annual Report on Form 10-K for the year ending December 31, 2011, annual management assessments of the effectiveness of our internal control over financial reporting and a report by our independent registered public accounting firm addressing these assessments. These reporting and other obligations will place significant demands on our management and administrative and operational resources, including accounting resources. To comply with these requirements, we anticipate that we will need to upgrade our systems, including information technology, implement additional financial and management controls, reporting systems and procedures and hire additional accounting and finance staff. We expect to incur additional annual expenses related to these steps, and those expenses may be significant. If we are unable to upgrade our financial and management controls, reporting systems, information technology and procedures in a timely and effective fashion, our ability to comply with our

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financial reporting requirements and other rules that apply to reporting companies under the Exchange Act could be impaired. Any failure to achieve and maintain effective internal controls could have a material adverse effect on our business, financial condition, results of operations and cash flows.

We have substantial debt obligations that could restrict our business, financial condition, results of operations or cash flows and the separation of our business from Marathon’s upstream business may lead to an increase in the overall cost of debt funding and a decrease in the overall debt capacity and commercial credit available to the combined businesses. Also, our business, financial condition, results of operations and cash flows could be harmed by a deterioration of our credit profile or by factors adversely affecting the credit markets generally.

As a result of the completion of the spin-off, we must finance our company’s capital needs on a stand-alone basis. In anticipation of the spin-off, on February 1, 2011, we completed the offering of $3.0 billion in aggregate principal amount of outstanding notes. Immediately following the spin-off, our total combined indebtedness for borrowed money and capital lease obligations was approximately $3.274 billion. We may also incur substantial additional indebtedness in the future.

Our indebtedness may impose various restrictions and covenants on us that could have material adverse consequences, including:

Our board of directors and management do not expect that the spin-off will improve access to debt markets or commercial credit, particularly for us. As integration has enhanced Marathon Oil’s scale and diversity of operations, given the countercyclical nature of upstream and downstream operations, the separation of the two businesses may lead to an increase in the overall cost of debt funding and a decrease in overall debt and commercial credit capacity, including credit extended by third-party suppliers. Nonetheless, our board of directors and management believe that the spin-off should not reduce our financing alternatives in a manner that would outweigh the other benefits of the spin-off.

In addition, a deterioration in our credit profile could increase our costs of borrowing money and limit our access to the capital markets and commercial credit, which could materially adversely affect our business, financial condition, results of operations and cash flows.

During the past three years, the credit markets and the financial services industry experienced a period of unprecedented turmoil and upheaval characterized by the bankruptcy, failure, collapse or sale of various financial institutions and an unprecedented level of intervention from the United States federal government. These circumstances and events led to reduced credit availability, tighter lending standards and higher interest rates on loans. While we cannot predict the future conditions of the credit markets, future turmoil in the credit markets could have a material adverse effect on our business, liquidity, financial condition and cash flows, particularly if our ability to borrow money from lenders or access the capital markets to finance our operations were to be impaired.

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We may have received better terms from unaffiliated third parties than the terms we receive in our agreements with Marathon Oil.

The agreements we entered into with Marathon Oil in connection with the spin-off, including the separation and distribution agreement, tax sharing agreement, employee matters agreement and transition services agreement, were negotiated in the context of the spin-off while we were still a wholly owned subsidiary of Marathon Oil. Accordingly, during the period in which the terms of those agreements were negotiated, we did not have an independent board of directors or a management team that was independent of Marathon Oil. As a result, the terms of those agreements may not reflect terms that would have resulted from arm’s-length negotiations between unaffiliated third parties. The terms of the agreements we negotiated in the context of the spin-off related to, among other things, the allocation of assets, liabilities, rights and other obligations between Marathon Oil and us. Arm’s-length negotiations between Marathon Oil and an unaffiliated third party in another form of transaction, such as a buyer in a sale of a business transaction, may have resulted in more favorable terms to the unaffiliated third party. See “Relationship with Marathon Oil After the Spin-Off—Agreements Between Marathon Oil and Us” in our registration statement on Form 10 filed with the SEC on January 25, 2011, as amended, which is incorporated by reference into this prospectus.

Several members of our board of directors and management may have actual or potential conflicts of interest because of their ownership of shares of common stock of Marathon Oil.

Several members of our board of directors and management own common stock of Marathon Oil and/or options to purchase common stock of Marathon Oil because of their prior relationships with Marathon Oil, which could create, or appear to create, potential conflicts of interest when our directors and executive officers are faced with decisions that could have different implications for our company and Marathon Oil. See “Management” in our registration statement on Form 10 filed with the SEC on January 25, 2011, as amended, which is incorporated by reference into this prospectus.

Risks Relating to Our Industry and Our Business

A substantial or extended decline in refining and marketing gross margins would reduce our operating results and cash flows and could materially adversely impact our future rate of growth and the carrying value of our assets.

Refining and marketing gross margins fluctuate widely. Our revenues, operating results, cash flows and future rate of growth are highly dependent on the margins we realize on our refined products. Our cost of producing refined products is influenced by a number of conditions, including the price of crude oil. We do not produce crude oil and must purchase all the crude oil we refine, and the price of that crude oil fluctuates due to a variety of worldwide market conditions. Generally, an increase or decrease in the price of crude oil affects our cost to produce gasoline and other refined products. However, the prices for crude oil and prices for our refined products can fluctuate in different directions based on global market conditions. In addition, the timing of the relative movement of the prices (both among different classes of refined products and among various global markets for similar refined products) as well as the overall change in refined product prices, can reduce profit margins. Historically, the markets for refined products have been volatile and may continue to be volatile in the future. Many of the factors influencing refining and marketing gross margins are beyond our control. These factors include:

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Some of these factors can vary by region and may change quickly, adding to market volatility, while others may have long-term effects. The long-term effects of these and other factors on refining and marketing gross margins are uncertain.

We purchase our refinery feedstocks weeks before refining and selling the refined products. Price level changes during the period between purchasing feedstocks and selling the refined products from these feedstocks could have a significant effect on our financial results. We also purchase refined products manufactured by others for sale to our customers. Price level changes during the periods between purchasing and selling those refined products also could have a material adverse effect on our business, financial condition, results of operations and cash flows.

Lower refining and marketing gross margins may reduce the amount of refined product that we produce, which may reduce our revenues, operating income and cash flows. Significant reductions in refining and marketing gross margins could require us to reduce our capital expenditures or impair the carrying value of our assets.

The availability of crude oil and increases in crude oil prices may reduce our refining, marketing and transportation profitability and refining and marketing gross margins.

The profitability of our operations depends largely on the difference between the cost of crude oil and other feedstocks that we refine and the selling prices we obtain for refined products. A significant portion of our crude oil is purchased from various foreign national oil companies, producing companies and trading companies, including suppliers from the Middle East. These purchases are subject to political, geographic and economic risks attendant to doing business with suppliers located in that area of the world. Our overall profitability could be materially adversely affected by the availability of supply and rising crude oil and other feedstock prices that we do not recover in the marketplace. Refining and marketing gross margins historically have been volatile and vary with the level of economic activity in the various marketing areas, the regulatory climate, logistical capabilities and the available supply of refined products. Our overall profitability could be materially adversely affected by factors that affect those margins, such as rising refined product prices that we are not able to recover in the retail marketplace.

Changes in environmental or other laws or regulations may reduce our refining and marketing gross margins.

Various environmental, safety, health, security, marketing and pricing laws and regulations have imposed, and are expected to continue to impose, increasingly stringent and costly requirements on our operations, which may reduce our refining and marketing gross margins. Environmental laws and regulations, in particular, are subject to frequent change, and many of them have become and will continue to become more stringent.

We believe it is likely that the scientific and political attention to issues concerning the extent of, causes of, and responsibility for climate change will continue, with the potential for further laws and regulations that could affect our operations. Currently, various legislative and regulatory measures to address greenhouse gas emissions (including carbon dioxide, methane and nitrous oxides) are in various phases of review, discussion or implementation in the United States. These include proposed federal legislation and state actions to develop statewide or regional programs, each of which could impose reductions in greenhouse gas emissions. These

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actions could result in increased (1) costs to operate and maintain our facilities, (2) capital expenditures to install new emission controls on our facilities and (3) costs to administer and manage any potential greenhouse gas emissions regulations or carbon trading or tax programs. Although uncertain, these developments could increase our costs, reduce the demand for the products we sell and create delays in our obtaining air pollution permits for new or modified facilities.

Renewable fuels mandates have reduced and likely will further reduce demand for refined products. Tax incentives and other subsidies have made renewable fuels more competitive with refined products than they otherwise would have been, which may have reduced and may further reduce refined product margins and their ability to compete with renewable fuels. In 2007, the U.S. Congress passed the Energy Independence and Security Act, or EISA, which, among other things, sets a target of 35 miles per gallon for the combined fleet of cars and light trucks in the United States by model year 2020, and contains a multiple-part Renewable Fuel Standard, commonly referred to as RFS2. The RFS2 was 9.0 billion gallons of renewable fuel in 2008, and will increase to 36.0 billion gallons in 2022. In the near term, the RFS2 will be satisfied primarily with fuel ethanol blended into gasoline. The RFS2 presents production and logistics challenges for both the fuel ethanol and petroleum refining industries. The RFS2 has required, and may in the future continue to require, additional capital expenditures or expenses by us to accommodate increased fuel ethanol use. Within the overall 36.0 billion gallon RFS2, EISA establishes an advanced biofuel RFS2 that begins with 0.95 billion gallons in 2010 and increases to 21.0 billion gallons in 2022. Subsets within the advanced biofuel RFS2 include 1.15 billion gallons of biomass-based diesel in 2010 (due to combining the 2009 and 2010 volumes), which is capped at 1.0 billion gallons beginning in 2012, and 0.1 billion gallons of cellulosic biofuel in 2010, increasing to 16.0 billion gallons by 2022. The advanced biofuels programs will present specific challenges in that we may have to enter into arrangements with other parties to meet our obligations to use advanced biofuels, including biomass-based diesel and cellulosic biofuel, with potentially uncertain supplies of these new fuels. There will be compliance costs and uncertainties regarding how we will comply with the various requirements contained in this law and related regulations. We may experience a decrease in demand for refined petroleum products due to an increase in combined fleet mileage or due to refined petroleum products being replaced by renewable fuels.

Our operations and those of our predecessors could expose us to civil claims by third parties for alleged liability resulting from contamination of the environment or personal injuries caused by releases of crude oil, motor fuel and other substances. For example, we have been, and presently are, a defendant in lawsuits involving products liability and other claims related to alleged contamination of groundwater with the gasoline oxygenate methyl tertiary butyl ether, or MTBE. We may become involved in further litigation or other proceedings, or we may be held responsible in existing or future litigation or proceedings, the costs of which could materially and adversely affect our business, financial condition, results of operations and cash flows.

We have in the past operated retail marketing sites with underground storage tanks, or USTs, in various jurisdictions, and are currently operating retail marketing sites that have USTs in numerous states in the United States. Federal and state regulations and legislation govern the USTs, and compliance with those requirements can be costly. The operation of USTs also poses certain other risks, including damages associated with soil and groundwater contamination. Leaks from USTs which may occur at one or more of our retail marketing sites, or which may have occurred at our previously operated retail marketing sites, may impact soil or groundwater and could result in substantial cleanup costs, fines or civil liability for us. The discovery of additional contamination or the imposition of additional cleanup obligations at these or other sites in the future could result in significant additional costs.

We have in the past and will continue to dispose of various wastes at lawful disposal sites. Environmental laws including the Comprehensive Environmental Response, Compensation, and Liability Act, or CERCLA, and similar state laws can impose liability for the entire cost of cleanup on any responsible party, without regard to negligence or fault, and impose liability on us for the conduct of others or conditions others have caused, or for our acts that complied with all applicable requirements when we performed them. See “Business—Environmental Matters” and “—Legal Proceedings” in our registration statement on Form 10 filed with the SEC on January 25, 2011, as amended, which is incorporated by reference into this prospectus.

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If foreign ownership of our stock exceeds certain levels, we could be prohibited from operating inland river vessels, which could materially and adversely affect our business, financial condition, results of operations and cash flows.

We are subject to a variety of U.S. federal statutes and regulations, including the Shipping Act of 1916, as amended, and the Merchant Marine Act of 1920, as amended, that govern the ownership and operation of certain vessels used to carry cargo between U.S. ports, which we refer to collectively as the Maritime Laws. Generally, the Maritime Laws require that vessels engaged in U.S. coastwise trade, and corporations operating such vessels, must be owned by U.S. citizens. Although our certificate of incorporation contains provisions intended to assure compliance with these provisions of the Maritime Laws, if we fail to maintain compliance we would be prohibited from operating vessels in the U.S. inland waters during any period in which we did not comply with these regulations. Such a prohibition could materially and adversely affect our business, financial condition, results of operations and cash flows.

If we are unable to complete capital projects at their expected costs and in a timely manner, or if the market conditions assumed in our project economics deteriorate, our business, financial condition, results of operations and cash flows could be materially and adversely affected.

Delays or cost increases related to capital spending programs involving engineering, procurement and construction of facilities (including the upgrading and expansion of our Detroit refinery and improvements and repairs to our other facilities) could materially adversely affect our ability to achieve forecasted internal rates of return and operating results. Delays in making required changes or upgrades to our facilities could subject us to fines or penalties as well as affect our ability to supply certain products we produce. Such delays or cost increases may arise as a result of unpredictable factors, many of which are beyond our control, including:

Any one or more of these factors could have a significant impact on our ongoing capital projects, including the upgrading and expansion of our Detroit refinery. If we were unable to make up the delays associated with such factors or to recover the related costs, or if market conditions change, it could materially and adversely affect our business, financial condition, results of operations and cash flows.

We will continue to incur substantial capital expenditures and operating costs as a result of compliance with, and changes in, environmental, health, safety and security laws and regulations, and, as a result, our business, financial condition, results of operations and cash flows could be materially and adversely affected.

Our businesses are subject to numerous laws, regulations and other requirements relating to the protection of the environment, including those relating to the discharge of materials into the environment, waste management, pollution prevention, greenhouse gas emissions, and characteristics and composition of gasoline and diesel fuels, as well as laws and regulations relating to public and employee safety and health and to facility security. We have incurred and will continue to incur substantial capital, operating and maintenance, and remediation expenditures as a result of these laws and regulations. To the extent these expenditures, as with all costs, are not ultimately reflected in the prices of our products and services, our operating results will be adversely affected.

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The specific impact of these laws and regulations on us and our competitors may vary depending on a number of factors, including the age and location of operating facilities, marketing areas, crude oil and feedstock sources, and production processes. We may also be required to make expenditures to modify operations, install pollution control equipment, perform site cleanups or curtail operations that could materially and adversely affect our business, financial condition, results of operations and cash flows. We may become subject to liabilities that we currently do not anticipate in connection with new, amended or more stringent requirements, stricter interpretations of existing requirements or the future discovery of contamination. In addition, any failure by us to comply with existing or future laws or regulations could result in civil penalties or criminal fines and other sanctions and enforcement actions against us.

Legislation or regulatory activity that impacts or could impact our operations includes, among others:

Although there may be adverse financial impacts (including compliance costs, potential permitting delays and potential reduced demand for crude oil or certain refined products) associated with any legislation, regulation, EPA action or other action, the extent and magnitude of that impact cannot be reliably or accurately estimated due to the fact that various requirements have only recently been adopted and the present uncertainty regarding additional measures and how they may be implemented. Private-party litigation has also been brought against various emitters of greenhouse gas emissions, but we have not been named in any of those lawsuits.

Worldwide political and economic developments could materially and adversely impact our business, financial condition, results of operations and cash flows.

Local political and economic factors in global markets could have a material adverse effect on us. Continued hostilities in the Middle East and the occurrence or threat of future terrorist attacks could adversely affect the economies of the United States and other developed countries. A lower level of economic activity could result in a decline in energy consumption, which could cause our revenues and margins to decline and limit our future growth prospects. These risks could lead to increased volatility in prices for refined products. Additionally, these risks could increase instability in the financial and insurance markets and make it more difficult or costly for us to access capital and to obtain the insurance coverage that we consider adequate.

In addition, a significant portion of our feedstock requirements is satisfied through supplies originating in Saudi Arabia, Kuwait, Canada, Mexico and various other foreign countries. We are, therefore, subject to the

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political, geographic and economic risks attendant to doing business with suppliers located in, and supplies originating from, those areas. If one or more of our supply sources were eliminated, or if political events disrupt our traditional crude oil supply, we believe that adequate alternative supplies of crude oil would be available, but it is possible that we would be unable to find alternative sources of supply. If we are unable to obtain adequate crude oil volumes or are able to obtain such volumes only at unfavorable prices, our operations could be adversely affected, including reduced sales volumes of refined products or reduced margins as a result of higher crude oil costs, materially and adversely impacting our business, financial condition, results of operations and cash flows.

Actions of governments through tax and other legislation, executive order and commercial restrictions could reduce our operating profitability. The U.S. government can prevent or restrict us from doing business with foreign countries.

Competitors that produce their own supply of feedstocks, have more extensive retail outlets, or have greater financial resources may have a competitive advantage.

The downstream petroleum business is highly competitive, particularly with regard to accessing crude oil and feedstock supply and marketing refined products. We compete with many companies for available supplies of crude oil and other feedstocks and for outlets for our refined products. In addition, we compete with producers and marketers in other industries that supply alternative forms of energy and fuels to satisfy the requirements of our industrial, commercial and individual consumers. We do not produce any of our crude oil supply. Many of our competitors, however, obtain a significant portion of their crude oil from their own exploration and production activities and some have more extensive retail outlets than we have. Competitors that have their own exploration and production activities are at times able to offset losses from downstream operations with profits from upstream operations, and may be better positioned to withstand periods of depressed refined product margins or feedstock shortages.

Some of our competitors also have significantly greater financial and other resources than we have. Those competitors may have a greater ability to respond to volatile industry or market conditions, such as shortages of crude oil or other feedstocks or intense price fluctuations.

We also face strong competition in the market for the sale of retail gasoline, diesel and merchandise. Our competitors include service stations and convenience stores owned or operated by fully integrated major oil companies or their dealers or jobbers and other well-recognized national or regional retail outlets, often selling gasoline or merchandise at very competitive prices. In recent years, several non-traditional retailers, such as supermarkets, club stores and mass merchants, have entered the retail fuel business. These non-traditional gasoline retailers have obtained a significant share of the transportation fuels market, and we expect their market share to grow. Because of their diversity, integration of operations, experienced management and greater resources, these companies may be better able to withstand volatile market conditions or levels of low or no profitability in the retail segment of the market. In addition, these retailers may use promotional pricing or discounts, both at the pump and in the store, to encourage in-store merchandise sales. These activities by our competitors could pressure us to offer similar discounts, adversely affecting our profit margins. Additionally, the loss of market share by our retail fuel and convenience stores to these and other retailers relating to either gasoline or merchandise could have a material adverse effect on our business, financial condition, results of operations and cash flows.

Our operations are subject to business interruptions and casualty losses. We do not insure against all potential losses and, therefore, our business, financial condition, results of operations and cash flows could be seriously harmed by unexpected liabilities and increased costs.

Our operations are subject to business interruptions due to scheduled refinery turnarounds and unplanned events such as explosions, fires, pipeline ruptures or other interruptions, crude oil or refined product spills, severe weather and labor disputes. For example, some of our pipelines provide the almost exclusive form of

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transportation of crude oil to, or refined products from, some of our refineries, and a prolonged interruption in service of any of these pipelines as a result of a pipeline rupture or due to any other reason could materially and adversely affect the operations, profitability and cash flows of the connected refinery. Similar risks may apply to third parties who transport crude oil and refined products to, from and among our facilities. Any prolonged, unplanned interruption in our operations could have a material adverse effect on our business, financial condition, results of operations and cash flows. Our operations are also subject to the additional hazards of pollution, releases of toxic gas and other environmental hazards and risks. These hazards could result in serious personal injury or loss of human life, significant damage to property and equipment, environmental pollution, impairment of operations and substantial losses to us. Various hazards have adversely affected us in the past, and damages resulting from a catastrophic occurrence in the future involving us or any of our assets or operations may result in our being named as a defendant in one or more lawsuits asserting potentially substantial claims or in our being assessed potentially substantial fines by governmental authorities.

We maintain insurance against many, but not all, potential losses or liabilities arising from operating hazards in amounts that we believe to be prudent. Uninsured losses and liabilities arising from operating hazards could reduce the funds available to us for capital and investment spending and could have a material adverse effect on our business, financial condition, results of operations and cash flows. Historically, we have maintained insurance coverage for physical damage and resulting business interruption to our major facilities, with significant self-insured retentions. In the future, we may not be able to maintain or obtain insurance of the type and amount we desire at reasonable rates. As a result of market conditions, premiums and deductibles for certain of our insurance policies have increased substantially and could escalate further. In some instances, certain insurance could become unavailable or available only for reduced amounts of coverage. For example, due to hurricane activity in recent years, the availability of insurance coverage for our facilities for windstorms in the Gulf of Mexico region has been reduced.

We are subject to interruptions of supply and increased costs as a result of our reliance on third-party transportation of crude oil and refined products.

We utilize the services of third parties to transport crude oil and refined products to and from our refineries. In addition to our own operational risks discussed above, we could experience interruptions of supply or increases in costs to deliver refined products to market if the ability of the pipelines or vessels to transport crude oil or refined products is disrupted because of weather events, accidents, governmental regulations or third-party actions. A prolonged disruption of the ability of a pipeline or vessels to transport crude oil or refined product to or from one or more of our refineries could have a material adverse effect on our business, financial condition, results of operation and cash flows.

Our operating results are seasonal and generally are lower in the first and fourth quarters of the year.

Demand for gasoline and diesel is higher during the spring and summer months than during the winter months in most of our markets due to seasonal increases in highway traffic. As a result, our operating results for the first and fourth quarters are generally lower than for those in the second and third quarters of each year.

We may incur losses as a result of our forward-contract activities and derivative transactions.

We currently use commodity derivative instruments, and we expect to enter into these types of transactions in the future, as well as derivative financial instruments such as interest rate swaps and interest rate cap agreements. If the instruments we utilize to manage our exposure to various types of risk are not effective, we may incur losses.

Compliance with and changes in tax laws could materially and adversely affect our performance.

We are subject to extensive tax liabilities, including federal and state income taxes and transactional taxes such as excise, sales/use, payroll, franchise, withholding and property taxes. New tax laws and regulations and changes in existing tax laws and regulations could result in increased expenditures by us for tax liabilities in the future. Many of these liabilities are subject to periodic audits by taxing authorities. Subsequent changes to our tax liabilities as a result of these audits could subject us to interest and penalties.

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Litigation by private plaintiffs or government officials could materially and adversely affect our business, financial condition, results of operations and cash flows.

We currently are defending litigation and anticipate that we will be required to defend new litigation in the future. The subject matter of such litigation may include releases of hazardous substances from our facilities, products liability, consumer credit or privacy laws, product pricing or antitrust laws or any other laws or regulations that apply to our operations. While an adverse outcome in most litigation matters would not be expected to be material to us, in some litigation the plaintiff or plaintiffs seek alleged damages involving large classes of potential litigants, and may allege damages relating to extended periods of time or other alleged facts and circumstances that could increase the amount of potential damages. Attorneys general and other government officials may pursue litigation in which they seek to recover civil damages from companies on behalf of a state or its citizens for a variety of claims, including violation of consumer protection and product pricing laws or natural resources damages. We are defending litigation of that type and anticipate that we will be required to defend new litigation of that type in the future. If we are not able to successfully defend such litigation, it may result in liability to our company that could materially and adversely affect our business, financial condition, results of operations and cash flows. We do not have insurance covering all of these potential liabilities. In addition to substantial liability, plaintiffs in litigation may also seek injunctive relief which, if imposed, could have a material adverse effect on our future business, financial condition, results of operations and cash flows.

Distributions from our subsidiaries may be inadequate to fund our capital needs, payments on our indebtedness and dividends on our common stock.

As a holding company, we derive substantially all our income from, and hold substantially all of our assets through, our subsidiaries. As a result, we depend on distributions of funds from our subsidiaries to meet our capital needs and our payment obligations with respect to our indebtedness. Our operating subsidiaries are separate and distinct legal entities and have no obligation to pay any amounts due with respect to our indebtedness or to provide us with funds for our capital needs or our debt payment obligations, whether by dividends, distributions, loans or otherwise. In addition, provisions of applicable law, such as those restricting the legal sources of dividends, could limit our subsidiaries’ abilities to make payments or other distributions to us, or our subsidiaries could agree to contractual restrictions on their ability to make distributions.

Our rights with respect to the assets of any subsidiary and, therefore, the rights of our creditors with respect to those assets are effectively subordinated to the claims of that subsidiary’s creditors. In addition, if we were a creditor of any subsidiary, our rights as a creditor would be subordinate to any security interest in the assets of that subsidiary and any indebtedness of that subsidiary senior to that held by us.

If we cannot obtain funds from our subsidiaries as a result of restrictions under debt instruments, applicable laws and regulations or otherwise, we may not be able to meet our capital needs, pay interest or principal with respect to our indebtedness when due or pay dividends on our common stock, and we cannot assure you that we would be able to obtain the necessary funds from other sources on terms that will be acceptable to us.

The loss of the services of one or more of our key personnel, or our failure to attract, assimilate and retain trained personnel in the future, could disrupt our operations and result in loss of revenues.

Our success depends on the continued active participation of our executive officers and key operating personnel. The unexpected loss of the services of any one of these persons could adversely affect our operations.

Our operations require the services of employees having the technical training and experience necessary to obtain the proper operational results. As such, our operations depend, to a considerable extent, on the continuing availability of such personnel. If we should suffer any material loss of personnel to competitors or be unable to employ additional or replacement personnel with the requisite level of training and experience to adequately operate our business, our operations could be adversely affected. A significant increase in the wages paid by

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other employers could result in a reduction in our workforce, increases in wage rates, or both. If either of these events occurred for a significant period of time, our financial condition, results of operations and cash flows could be adversely impacted.

A portion of our workforce is unionized, and we may face labor disruptions that could materially and adversely affect our business, financial condition, results of operations and cash flows.

Approximately 47 percent of our refining hourly employees are covered by collective bargaining agreements. The contracts for the hourly workers at our Catlettsburg and Canton refineries are scheduled to expire in January 2012, and the contracts for the hourly workers at our Texas City and Detroit refineries are scheduled to expire in March 2012 and January 2014, respectively. We cannot assure you that these contracts will not be renewed at an increased cost to us or that we will not experience work stoppages in the future as a result of labor disagreements.

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USE OF PROCEEDS

We will not receive any cash proceeds from the issuance of the exchange notes. Because we are exchanging the exchange notes for the outstanding notes, which have substantially identical terms, the issuance of the exchange notes will not result in any increase in our indebtedness.

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RATIO OF EARNINGS TO FIXED CHARGES

Our ratios of earnings to fixed charges for each of the periods indicated are as follows:

The term “earnings” is the amount resulting from adding the following items to the extent applicable:

and subtracting from the total the following:

For this purpose, “fixed charges” consists of:

The ratios presented above are based on our historical combined and consolidated financial statements. As described in Note 1 to our audited combined financial statements included in our registration statement on Form 10 filed with the SEC on January 25, 2011, as amended, which is incorporated by reference into this prospectus, and in Note 1 to our unaudited consolidated financial statements included in our Quarterly Report on Form 10-Q for the quarterly period ended June 30, 2011, which is incorporated by reference into this prospectus, the combined and consolidated financial statements were prepared in connection with the spin-off, and for periods prior to the completion of the spin-off on June 30, 2011, reflect the combined historical results of operations, financial position and cash flows of the Marathon Oil subsidiaries that operated the Refining, Marketing & Transportation Business of Marathon Oil, which we refer to in this prospectus as the “RM&T Business,” as if such businesses had been combined for all periods presented. Our capital structure changed significantly as a result of the spin-off. Accordingly, the ratios for periods prior to the spin-off may not be indicative of the ratios after giving effect to the spin-off.

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SELECTED HISTORICAL CONSOLIDATED FINANCIAL DATA

The following table presents our selected historical consolidated financial information. For periods prior to the June 30, 2011 spin-off, our selected historical consolidated financial data reflect the combined historical results of operations, financial position and cash flows of the Marathon Oil subsidiaries that operated the RM&T Business, as if such businesses had been combined for all periods presented. The historical consolidated financial information as of and for the years ended December 31, 2010, 2009 and 2008 is derived from our audited combined financial statements included in our registration statement on Form 10 filed with the SEC on January 25, 2011, as amended, which is incorporated by reference into this prospectus. The historical consolidated financial information as of June 30, 2011 and for the six-month periods ended June 30, 2011 and 2010 is derived from our unaudited consolidated financial statements included in our Quarterly Report on Form 10-Q for the quarterly period ended June 30, 2011, which is incorporated by reference into this prospectus. The historical consolidated financial information as of and for the years ended December 31, 2007 and 2006 is derived from our unaudited combined financial statements not included in or incorporated by reference into this prospectus.

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UNAUDITED PRO FORMA CONDENSED CONSOLIDATED FINANCIAL DATA

Unaudited pro forma condensed consolidated financial data of MPC presented below have been derived from our historical combined and consolidated financial statements incorporated by reference in this prospectus. Prior to the spin-off on June 30, 2011, our financial position, results of operations and cash flows reflect the combined historical results of the RM&T Business. The RM&T Business represented a combined reporting entity. Our consolidated statements of income as reported for the six months ended June 30, 2011 and for the year ended December 31, 2010 consist entirely of the combined results of the RM&T Business.

The pro forma adjustments give effect to the separation of Marathon Oil’s refining, marketing and transportation businesses into an independent publicly traded company. The unaudited pro forma condensed consolidated financial data should be read in conjunction with “Management’s Discussion and Analysis of Financial Condition and Results of Operations” and our historical combined and consolidated financial statements and the notes to those statements, which are included in our registration statement on Form 10 filed with the SEC on January 25, 2011, as amended, and our Quarterly Report on Form 10-Q for the quarterly period ended June 30, 2011, which are incorporated by reference into this prospectus.

The unaudited pro forma condensed consolidated statements of income for the six months ended June 30, 2011 and the year ended December 31, 2010 have been prepared as though the spin-off occurred as of January 1, 2010. The pro forma adjustments are based on available information and assumptions that our management believes are reasonable; however, such adjustments are estimates and may not prove to be accurate, as MPC does not have a history of operating as a stand-alone company.

The pro forma adjustments include, among other things, the income statement impact related to the following items:

Our unaudited pro forma condensed consolidated statements of income do not include adjustments for all of the costs of operating as a stand-alone company. Only costs that management has currently determined to be factually supportable and recurring are included as adjustments in the unaudited pro forma condensed consolidated financial data. Incremental costs and expenses associated with being a stand-alone company, which are not reflected in the unaudited pro forma condensed consolidated statements of income, are estimated to be approximately $25 million annually.

The unaudited pro forma condensed consolidated statements of income include the financial results of the Northern-Tier Assets until December 1, 2010.

The unaudited pro forma condensed consolidated financial data are for illustrative purposes only and do not reflect what our financial position and results of operations would have been had the spin-off occurred on the date indicated and are not necessarily indicative of our future financial position and future results of operations.

The unaudited pro forma condensed consolidated financial data constitute forward-looking information and are subject to certain risks and uncertainties that could cause actual results to differ materially from those anticipated. See “Cautionary Statement Concerning Forward-Looking Statements” in this prospectus.

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MARATHON PETROLEUM CORPORATION

Unaudited Pro Forma Condensed Consolidated Statement of Income

Six Months Ended June 30, 2011

See Notes to Unaudited Pro Forma Condensed Consolidated Financial Data

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MARATHON PETROLEUM CORPORATION

Unaudited Pro Forma Condensed Consolidated Statement of Income

Year Ended December 31, 2010

See Notes to Unaudited Pro Forma Condensed Consolidated Financial Data

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MARATHON PETROLEUM CORPORATION

Notes to Unaudited Pro Forma Condensed Consolidated Financial Data

Pro forma interest expense was calculated based on a blended interest rate of 5.31%, which includes amortization of an $11 million original issue discount on the indebtedness. Interest expense also includes amortization on approximately $60 million of debt issuance costs related to the $3.0 billion debt incurrence, our new $2.0 billion revolving credit facility and our new $1.0 billion trade receivables securitization facility. Such costs are amortized over the terms of the associated debt. Interest expense also includes a commitment fee on the new revolving credit facility. The calculation of interest expense assumes constant debt levels throughout the periods presented.

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DESCRIPTION OF OTHER DEBT

Revolving Credit Facility

In March 2011, to provide us with additional liquidity following the spin-off, we entered into a four-year revolving credit agreement with a syndicate of lenders, including JPMorgan Chase Bank, National Association, as administrative agent. The revolving credit facility provides us with an initial borrowing capacity of up to $2.0 billion and the ability to increase borrowing capacity to $2.5 billion, subject to certain conditions. We may obtain up to $1.5 billion of letters of credit and up to $100 million of swingline loans under the revolving credit facility. We may, subject to certain conditions, request that the term of the revolving credit facility be extended for up to two additional one-year periods. Each such extension would be subject to the approval of lenders holding greater than 50 percent of the commitments then outstanding, and the commitment of any lender that does not consent to an extension of the maturity date will be terminated on the then-effective maturity date. As of the date of this prospectus, we had no borrowings under the revolving credit facility.

Interest Rates

Borrowings of revolving loans under the revolving credit facility bear interest, at our option, at either LIBOR plus a margin ranging between 1.75 percent to 3.00 percent, depending on our credit ratings, or an alternate base rate plus a margin ranging between 0.75 percent to 2.00 percent, depending on our credit ratings. The revolving credit facility also provides for customary fees, including administrative agent fees, commitment fees, fees in respect of letters of credit and other fees.

Covenants

The revolving credit facility contains covenants that we consider usual and customary for an agreement of this type, including a maximum ratio of consolidated indebtedness at the end of each fiscal quarter to consolidated EBITDA for the immediately preceding four fiscal quarter period of 3.0 to 1.0 and a minimum ratio of consolidated EBITDA to consolidated interest expense for each consecutive four fiscal quarter period of 3.5 to 1.0. In addition, the revolving credit facility includes limitations on indebtedness of our subsidiaries, other than subsidiaries that guarantee our obligations under the revolving credit facility or indebtedness owed to MPC or one of our majority-owned subsidiaries.

Defaults

Borrowings under the revolving credit facility are subject to acceleration upon the occurrence of events of default that we consider usual and customary for an agreement of this type, including but not limited to:

Account Receivables Securitization Facility

On July 1, 2011, certain subsidiaries of MPC entered into a $1.0 billion accounts receivable securitization facility, which was subsequently amended on October 1, 2011, to provide additional liquidity and funding for the ongoing business needs of MPC and its subsidiaries.

The receivables securitization facility is governed by (i) an Amended and Restated Receivables Purchase Agreement between Marathon Petroleum Company LP, a Delaware limited partnership and a wholly owned subsidiary of MPC, MPC Trade Receivables Company LLC, a Delaware limited liability company and a bankruptcy-remote special purpose entity that is a wholly owned subsidiary of MPC, which we refer to as Trade Receivables SPE, JPMorgan Chase Bank, N.A., as administrative agent, J.P. Morgan Securities LLC, as sole lead arranger, certain committed purchasers and conduit purchasers that are parties thereto from time to time and the other parties thereto from time to time and (ii) an Amended and Restated Receivables Sale Agreement between Marathon Petroleum Company LP and Trade Receivables SPE.

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Pursuant to the Receivables Sale Agreement, Marathon Petroleum Company LP, sells or contributes, on an ongoing basis, all of its trade receivables (other than receivables arising in connection with the extension of credit under its proprietary credit card services) and all of the trade receivables of Marathon Petroleum Trading Canada LLC, together with all related security and interests in the proceeds thereof, without recourse, to Trade Receivables SPE in exchange for a combination of cash, equity or a subordinated note issued by Trade Receivables SPE in favor of Marathon Petroleum Company LP.

Pursuant to the Receivables Purchase Agreement, Trade Receivables SPE may, from time to time, sell undivided interests in the trade receivables, to the extent that they are qualifying trade receivables under the Receivables Purchase Agreement, together with all related security and interests in the proceeds thereof, to the purchasers in exchange for cash proceeds. Collections on the trade receivables for which an undivided interest is sold to the purchasers will be set aside and held in trust to satisfy the obligations of Trade Receivables SPE under the Receivables Purchase Agreement. In addition, the receivables securitization facility provides for the issuance of letters of credit subject to the same limitations and qualifications applicable to sales of trade receivables under the facility. Receivables in the receivables securitization facility are subject to customary criteria, limits and reserves and in no event may the amount of outstanding qualified receivables sold to the purchasers under the Receivables Purchase Agreement and letters of credit outstanding under the facility exceed $1.0 billion.

As of the date of this prospectus, there were no trade receivable purchases or letters of credit outstanding under the receivables securitization facility.

The receivables securitization facility is for an initial three-year term as may be extended in accordance with the terms of the Receivables Purchase Agreement.

Marathon Petroleum Company LP services the trade receivables under the receivables securitization facility. Neither Marathon Petroleum Company LP nor Trade Receivables SPE guarantees collectability of the trade receivables or the creditworthiness of obligors thereunder. However, MPC has provided a guaranty of performance in respect of the obligations of Marathon Petroleum Company LP as originator under the Receivables Sale Agreement and as servicer under the Receivables Purchase Agreement.

Yield and Fees

Trade Receivables SPE pays yields and certain other costs with respect to amounts advanced under the receivables securitization facility. The calculation of yields and costs will vary based on the funding alternatives and our credit ratings and will be calculated at the applicable rates described in the Receivables Purchase Agreement.

Covenants

The Receivables Purchase Agreement contains affirmative and negative covenants that we believe to be customary for financing arrangements of a similar type and nature, including, but not limited to, financial reporting covenants and covenants limiting our ability to:

Amortization Events

Our receivables securitization facility contains certain amortization events that we believe to be customary for financing arrangements of a similar type and nature, including, but not limited to:

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Upon the occurrence of an amortization event set forth in the Receivables Purchase Agreement, the purchasers may terminate further purchases of undivided interests in the trade receivables or issuances of letters of credit under the facility, appoint a new servicer for the receivables, impose default fees and exercise certain other remedies available to the purchasers under the Receivables Purchase Agreement.

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THE EXCHANGE OFFER

Purpose and Effect of the Exchange Offer

On February 1, 2011, we sold $3.0 billion in principal amount of the outstanding notes in a private placement through initial purchasers. In connection with the sale of the outstanding notes, we and the initial purchasers entered into a registration rights agreement, dated as of February 1, 2011. Under that agreement, we must, among other things, use our commercially reasonable efforts to file with the SEC a registration statement under the Securities Act covering the exchange offer and to cause that registration statement to become effective under the Securities Act. Upon the effectiveness of that registration statement, we must also offer each holder of the outstanding notes the opportunity to exchange its outstanding notes for an equal principal amount at maturity of exchange notes. You are a holder with respect to the exchange offer if you are a person in whose name any outstanding notes are registered on our books or any other person who has obtained a properly completed assignment of outstanding notes from the registered holder. We are making the exchange offer to comply with our obligations under the registration rights agreement. A copy of the registration rights agreement has been filed as an exhibit to the registration statement of which this prospectus is a part.

In order to participate in the exchange offer, you must represent to us, among other things, that:

Resale of the Exchange Notes

Based on a previous interpretation by the Staff of the SEC set forth in no-action letters issued to third parties, including Exxon Capital Holdings Corporation (available May 13, 1988), Morgan Stanley & Co. Incorporated (available June 5, 1991), Mary Kay Cosmetics, Inc. (available June 5, 1991), Warnaco, Inc. (available October 11, 1991), and K-III Communications Corp. (available May 14, 1993), we believe that the exchange notes issued in the exchange offer may be offered for resale, resold, and otherwise transferred by you, except if you are an affiliate of us, without compliance with the registration and prospectus delivery provisions of the Securities Act, provided that the representations set forth in “—Purpose and Effect of the Exchange Offer” apply to you.

If you tender in the exchange offer with the intention of participating in a distribution of the exchange notes, you cannot rely on the interpretation by the Staff of the SEC as set forth in the Morgan Stanley & Co. Incorporated no-action letter and other similar letters and you must comply with the registration and prospectus delivery requirements of the Securities Act in connection with a secondary resale transaction. If our belief regarding resale is inaccurate, those who transfer exchange notes in violation of the prospectus delivery provisions of the Securities Act and without an exemption from registration under the federal securities laws may incur liability under these laws. We do not assume or indemnify you against this liability.

The exchange offer is not being made to, nor will we accept surrenders for exchange from, holders of outstanding notes in any jurisdiction in which the exchange offer or the acceptance thereof would not be in compliance with the securities or blue sky laws of the particular jurisdiction. Each broker-dealer that receives exchange notes for its own account in exchange for outstanding notes, where the outstanding notes were acquired by that broker-dealer as a result of market-making activities or other trading activities, must acknowledge that it

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will deliver a prospectus in connection with any resale of the exchange notes. See “Plan of Distribution.” In order to facilitate the disposition of exchange notes by broker-dealers participating in the exchange offer, we have agreed, subject to specific conditions, to make this prospectus, as it may be amended or supplemented from time to time, available for delivery by those broker-dealers to satisfy their prospectus delivery obligations under the Securities Act. Any holder that is a broker-dealer participating in the exchange offer must notify the exchange agent at the telephone number set forth in the enclosed letter of transmittal and must comply with the procedures for broker-dealers participating in the exchange offer. We have not entered into any arrangement or understanding with any person to distribute the exchange notes to be received in the exchange offer.

Terms of the Exchange Offer

Upon the terms and subject to the conditions set forth in this prospectus and in the letter of transmittal, we will accept any and all outstanding notes validly tendered and not withdrawn prior to 5:00 p.m., New York City time, on the day the exchange offer expires.

As of the date of this prospectus, $3.0 billion in principal amount of the outstanding notes are outstanding. This prospectus, together with the letter of transmittal, is being sent to all registered holders of the outstanding notes on this date. There will be no fixed record date for determining registered holders of the outstanding notes entitled to participate in the exchange offer; however, holders of the outstanding notes must tender their certificates therefor or cause their outstanding notes to be tendered by book-entry transfer before the expiration date of the exchange offer to participate.

The form and terms of the exchange notes will be the same as the form and terms of the outstanding notes of the corresponding series except that:

Following completion of the exchange offer, all rights under the registration rights agreement accorded to holders of outstanding notes, including the right to receive additional incremental interest on the outstanding notes, to the extent and in the circumstances specified in the registration rights agreement, will terminate.

We intend to conduct the exchange offer in accordance with the provisions of the registration rights agreement and applicable federal securities laws. Outstanding notes that are not tendered for exchange under the exchange offer will remain outstanding and will be entitled to the rights under the related indenture. Any outstanding notes not tendered for exchange will not retain any rights under the registration rights agreement and will remain subject to transfer restrictions. See “—Consequences of Failure to Exchange.”

We will be deemed to have accepted validly tendered outstanding notes when, as and if we will have given oral or written notice of its acceptance to the exchange agent. The exchange agent will act as agent for the tendering holders for the purposes of receiving the exchange notes from us. If any tendered outstanding notes are not accepted for exchange because of an invalid tender, the occurrence of other events set forth in this prospectus, or otherwise, certificates for any unaccepted outstanding notes will be returned, or, in the case of outstanding notes tendered by book-entry transfer, those unaccepted outstanding notes will be credited to an account maintained with The Depository Trust Company, or DTC, without expense to the tendering holder of those outstanding notes promptly after the expiration date of the exchange offer. See “—Procedure for Tendering Notes.”

Those who tender outstanding notes in the exchange offer will not be required to pay brokerage commissions or fees or, subject to the instructions in the letter of transmittal, transfer taxes with respect to the

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exchange under the exchange offer. We will pay all charges and expenses, other than applicable taxes described below, in connection with the exchange offer. See “—Fees and Expenses.”

Expiration Date; Extensions; Amendments

The expiration date is 5:00 p.m., New York City time on November 14, 2011, unless we, in our sole discretion, extend the exchange offer, in which case, the expiration date will be the latest date and time to which the exchange offer is extended. We may, in our sole discretion, extend the expiration date of the exchange offer or, upon the occurrence of particular events, terminate the exchange offer. The events that would cause us to terminate the exchange offer are set forth under “—Conditions.”

To extend the exchange offer, we must notify the exchange agent by oral or written notice before 9:00 a.m., New York City time, on the next business day after the previously scheduled expiration date and make a public announcement of the extension no later than 9:00 a.m., New York City time, on the next business day after the scheduled expiration date.

We reserve the right:

Any extension, termination or amendment will be followed as promptly as practicable by oral or written notice to the registered holders of the outstanding notes. If we amend the exchange offer in a manner that constitutes a material change, we will promptly disclose the amendment by means of a prospectus supplement that will be distributed to the registered holders of the outstanding notes, and we will extend the exchange offer for a period of at least five business days and up to ten business days, depending on the significance of the amendment and the manner of disclosure to the registered holders of the outstanding notes, if the exchange offer would otherwise expire during that extension period.

Without limiting the manner in which we may choose to make a public announcement of any extension, amendment or termination of the exchange offer, we will have no obligation to publish, advertise or otherwise communicate that public announcement, other than by making a timely release to an appropriate news agency.

When all the conditions to the exchange offer have been satisfied or waived, we will accept, promptly after the expiration date of the exchange offer, all outstanding notes properly tendered and will issue the exchange notes promptly after the expiration date of the exchange offer. See “—Conditions to the Exchange Offer” below. For purposes of the exchange offer, we will be deemed to have accepted properly tendered outstanding notes for exchange when, as and if we will have given oral or written notice of our acceptance to the exchange agent.

In all cases, issuance of the exchange notes for outstanding notes that are accepted for exchange under the exchange offer will be made only after timely receipt by the exchange agent of certificates for those outstanding notes or a timely confirmation of book-entry transfer of the outstanding notes into the exchange agent’s account at DTC, a properly completed and duly executed letter of transmittal, and all other required documents; provided, however, that we reserve the absolute right to waive any defects or irregularities in the tender of outstanding notes or in the satisfaction of conditions of the exchange offer by holders of the outstanding notes. If any tendered outstanding notes are not accepted for any reason set forth in the terms and conditions of the exchange offer, if the holder withdraws any previously tendered outstanding notes, or if outstanding notes are submitted for a greater principal amount of outstanding notes than the holder desires to exchange, then the unaccepted, withdrawn or portion of non-exchanged outstanding notes, as appropriate, will be returned promptly after the expiration or termination of the exchange offer, or, in the case of the outstanding notes tendered by book-entry

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transfer, those unaccepted, withdrawn or portion of non-exchanged outstanding notes, as appropriate, will be credited to an account maintained with DTC, without expense to the tendering holder.

Conditions to the Exchange Offer

Without regard to other terms of the exchange offer, we will not be required to exchange any exchange notes for any outstanding notes and may terminate the exchange offer before the acceptance of any outstanding notes for exchange and before the expiration of the exchange offer, if:

If, in our reasonable judgment, we determine that any of these conditions are not satisfied, we may:

Procedure for Tendering Notes

To tender in the exchange offer, you must complete, sign and date an original or facsimile letter of transmittal, have the signatures guaranteed if required by the letter of transmittal, and mail or otherwise deliver the letter of transmittal to the exchange agent before the expiration date of the exchange offer. You may also tender your outstanding notes by means of DTC’s Automatic Tenders Over the Participant Terminal System, or ATOP, subject to the terms and procedures of that system. If delivery is made through ATOP, you must transmit any agent’s message to the exchange agent account at DTC. The term “agent’s message” means a message, transmitted to DTC and received by the exchange agent and forming a part of a book-entry transfer, that states that DTC has received an express acknowledgement that you agree to be bound by the letter of transmittal and that we may enforce the letter of transmittal against you. In addition:

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To be tendered effectively, the exchange agent must receive the letter of transmittal and other required documents at the address set forth below under “—Exchange Agent” before the expiration of the exchange offer.

If you tender your outstanding notes and do not withdraw them before the expiration date of the exchange offer, you will be deemed to have an agreement with us in accordance with the terms and subject to the conditions set forth in this prospectus and in the letter of transmittal.

The method of delivery of outstanding notes and the letter of transmittal and all other required documents to the exchange agent is at your risk. Instead of delivery by mail, we recommend that you use an overnight or hand delivery service, properly insured. In all cases, you should allow sufficient time to assure delivery to the exchange agent before the expiration date of the exchange offer. You should not send your letter of transmittal or outstanding notes to us. You may request your respective broker, dealers, commercial banks, trust companies or nominees to effect the above transactions for you.

Any beneficial owner whose outstanding notes are registered in the name of a broker, dealer, commercial bank, trust company or other nominee and who wishes to tender its outstanding notes should contact the registered holder promptly and instruct that registered holder to tender the outstanding notes on the beneficial owner’s behalf. If the beneficial owner wishes to tender its outstanding notes on the owner’s own behalf, that owner must, before completing and executing the letter of transmittal and delivering its outstanding notes, either make appropriate arrangements to register ownership of the outstanding notes in that owner’s name or obtain a properly completed assignment from the registered holder. The transfer of registered ownership of outstanding notes may take considerable time.

Signatures on a letter of transmittal or a notice of withdrawal must be guaranteed by an eligible institution unless the related outstanding notes tendered are tendered:

If signatures on a letter of transmittal or a notice of withdrawal are required to be guaranteed, each of the following is deemed an eligible institution:

If the letter of transmittal is signed by a person other than the registered holder of any outstanding notes, the outstanding notes must be endorsed or accompanied by a properly completed bond power, signed by the registered holder as his, her or its name appears on the outstanding notes.

If trustees, executors, administrators, guardians, attorneys-in-fact, officers of corporations or others acting in a fiduciary or representative capacity sign the letter of transmittal or any outstanding notes or bond power, those persons should so indicate when signing, and evidence satisfactory to us of their authority to so act must be submitted with the letter of transmittal unless we waive such requirement.

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We will determine all questions as to the validity, form, eligibility, including time of receipt, acceptance of tendered outstanding notes, and withdrawal of tendered outstanding notes, in our sole discretion. All of these determinations by us will be final and binding. We reserve the absolute right to reject any and all outstanding notes not properly tendered or any outstanding notes our acceptance of which would, in the opinion of our counsel, be unlawful. We also reserve the right to waive any defects, irregularities or conditions of tender as to particular outstanding notes. Our interpretation of the terms and conditions of the exchange offer, including the instructions in the letter of transmittal will be final and binding on all parties. Unless waived, any defects or irregularities in connection with tenders of outstanding notes must be cured within the time we determine. Although we intend to notify holders of outstanding notes of defects or irregularities with respect to tenders of outstanding notes, neither we, nor the exchange agent, nor any other person will incur any liability for failure to give this notification. Tenders of outstanding notes will not be deemed to have been made until defects or irregularities have been cured or waived. Any outstanding notes received by the exchange agent that are not properly tendered and as to which the defects or irregularities have not been cured or waived will be returned by the exchange agent to the tendering holders of outstanding notes, unless otherwise provided in the letter of transmittal, promptly following the expiration date of the exchange offer.

In addition, we reserve the right, in our sole discretion, to purchase or make offers for any outstanding notes that remain outstanding subsequent to the expiration date of the exchange offer or, as set forth above under “—Conditions to the Exchange Offer” to terminate the exchange offer and, to the extent permitted by applicable law and the terms of our agreements relating to our outstanding indebtedness, purchase outstanding notes in the open market, in privately negotiated transactions or otherwise. The terms of any purchases or offers could differ from the terms of the exchange offer.

If the holder of outstanding notes is a broker-dealer participating in the exchange offer that will receive exchange notes for its own account in exchange for outstanding notes that were acquired as a result of market-making activities or other trading activities, that broker-dealer will be required to acknowledge in the letter of transmittal that it will deliver a prospectus in connection with any resale of the exchange notes and otherwise agree to comply with the procedures described above under “—Resale of the Exchange Notes”; however, by so acknowledging and delivering a prospectus, that broker-dealer will not be deemed to admit that it is an “underwriter” within the meaning of the Securities Act.

In all cases, issuance of exchange notes under the exchange offer will be made only after timely receipt by the exchange agent of certificates for the outstanding notes or a timely confirmation of book-entry transfer of outstanding notes into the exchange agent’s account at DTC, a properly completed and duly executed letter of transmittal, and all other required documents. If any tendered outstanding notes are not accepted for any reason set forth in the terms and conditions of the exchange offer or if outstanding notes are submitted for a greater principal amount of outstanding notes that the holder of the outstanding notes desires to exchange, the unaccepted or portion of non-exchanged outstanding notes will be returned as promptly as practicable after the expiration or termination of the exchange offer, or, in the case of outstanding notes tendered by book-entry transfer into the exchange agent’s account at DTC pursuant to the book-entry transfer procedures described below, the unaccepted or portion of non-exchanged outstanding notes will be credited to an account maintained with DTC, without expense to the tendering holder of outstanding notes.

Book-Entry Transfer

The exchange agent will make a request to establish an account with respect to the outstanding notes at DTC for the purposes of the exchange offer within two business days after the date of this prospectus, and any financial institution that is a participant in DTC’s system may make book-entry delivery of outstanding notes by causing DTC to transfer the outstanding notes into the exchange agent’s account at DTC in accordance with DTC’s procedures for transfer. However, although delivery of outstanding notes may be effected through book-entry transfer at DTC, the letter of transmittal or facsimile thereof, with any required signature guarantees and any other required documents, must, in any case, be transmitted to and received by the exchange agent at the address set forth below under “—Exchange Agent” on or before the expiration date of the exchange offer, unless

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the holder either (1) complies with the guaranteed delivery procedures described below or (2) sends an agent’s message through ATOP.

Guaranteed Delivery Procedures

Holders who wish to tender their outstanding notes and (1) whose outstanding notes are not immediately available or (2) who cannot deliver their outstanding notes, the letter of transmittal or any other required documents to the exchange agent prior to the expiration date, may effect a tender if:

Upon request to the exchange agent, a notice of guaranteed delivery will be sent to holders who wish to tender their outstanding notes according to the guaranteed delivery procedures set forth above.

Withdrawal of Tenders

Except as otherwise provided, tenders of outstanding notes may be withdrawn at any time before 5:00 p.m., New York City time, on the expiration date of the exchange offer.

To withdraw a tender of outstanding notes in the exchange offer, a written or facsimile transmission notice of withdrawal must be received by the exchange agent at its address set forth herein prior to 5:00 p.m., New York City time, on the expiration date of the exchange offer. Any notice of withdrawal must:

We will determine all questions as to the validity, form and eligibility of the notices, which determinations will be final and binding on all parties. Any outstanding notes withdrawn will be deemed not to have been validly tendered for purposes of the exchange offer, and no exchange notes will be issued with respect to those outstanding notes unless the outstanding notes withdrawn are validly retendered.

Any outstanding notes that have been tendered but that are not accepted for payment will be returned to the holder of those outstanding notes, or in the case of outstanding notes tendered by book-entry transfer, will be

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credited to an account maintained with DTC, without cost to the holder promptly after withdrawal, rejection of tender or termination of the exchange offer. Properly withdrawn outstanding notes may be retendered by following one of the procedures described above under “—Procedure for Tendering Notes” at any time prior to the expiration date of the exchange offer.

Termination of Certain Rights

All rights given to holders of outstanding notes under the registration rights agreement will terminate upon the consummation of the exchange offer except with respect to our duty:

Exchange Agent

The Bank of New York Mellon Trust Company, N.A. has been appointed exchange agent for the exchange offer. Questions and requests for assistance, requests for additional copies of this prospectus or the letter of transmittal, and requests for copies of the notice of guaranteed delivery with respect to the outstanding notes should be addressed to the exchange agent as follows:

OR

By Facsimile (for Eligible Institutions only): (212) 298-1915

By Telephone (to confirm receipt of facsimile): (212) 815-5920

Fees and Expenses

We will pay the expenses of soliciting tenders in connection with the exchange offer. The principal solicitation is being made by mail; however, additional solicitation may be made by telecopier, telephone or in person by our officers and regular employees and by officers and regular employees of our affiliates.

We have not retained any dealer-manager in connection with the exchange offer and will not make any payments to broker-dealers or others soliciting acceptances of the exchange offer. We, will however, pay the exchange agent reasonable and customary fees for its services and will reimburse the exchange agent for its reasonable out-of-pocket expenses in connection with the exchange offer.

We estimate that our cash expenses in connection with the exchange offer will be approximately $450,000. These expenses include registration fees, fees and expenses of the exchange agent, accounting and legal fees, and printing costs, among others.

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We will pay all transfer taxes, if any, applicable to the exchange of the outstanding notes for exchange notes. The tendering holder of outstanding notes, however, will pay applicable taxes if certificates representing outstanding notes not tendered or accepted for exchange are to be delivered to, or are to be issued in the name of, any person other than the registered holder of outstanding notes tendered, or:

If satisfactory evidence of payment of the transfer taxes or exemption from payment of transfer taxes is not submitted with the letter of transmittal, the amount of the transfer taxes will be billed directly to the tendering holder and the exchange notes need not be delivered until the transfer taxes are paid.

Consequences of Failure to Exchange

Participation in the exchange offer is voluntary. Holders of the outstanding notes are urged to consult their financial and tax advisors in making their own decisions on what action to take.

Outstanding notes that are not exchanged for the exchange notes in the exchange offer will not retain any rights under the registration rights agreement and will remain restricted securities for purposes of the federal securities laws. Accordingly, such outstanding notes may not be offered, sold, pledged or otherwise transferred except:

and in each case, in accordance with all other applicable securities laws and the terms of the indenture governing the outstanding notes.

Accounting Treatment

For accounting purposes, we will recognize no gain or loss as a result of the exchange offer. The exchange notes will be recorded at the same carrying value as the outstanding notes, as reflected in our accounting records on the date of the exchange.

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DESCRIPTION OF NOTES

The outstanding notes were, and the exchange notes will be, issued under an indenture dated as of February 1, 2011 between us and The Bank of New York Mellon Trust Company, N.A., as trustee (the “Trustee”). References to “the notes” include the outstanding notes and the exchange notes. The following description is a summary of the material terms of the indenture and the notes. You should read the indenture and the notes for more details regarding our obligations and your rights with respect to the notes. In this description of the notes, references to “MPC,” “the Company,” “we” or “us” refer only to Marathon Petroleum Corporation and not to any of its subsidiaries.

General

We are offering three series of exchange notes:

Interest on each series of notes will be payable semi-annually on March 1 and September 1 of each year, beginning on March 1, 2012, to the persons in whose names the notes are registered at the close of business on February 15 and August 15, respectively, preceding the interest payment date. Interest on each series of notes will be paid on the basis of a 360-day year consisting of twelve 30-day months.

The exchange notes will be issued in fully registered form only in denominations of $2,000 and integral multiples of $1,000.

We may, without the consent of the holders, increase the principal amounts of any series of notes in the future, on the same terms and conditions and with the same CUSIP numbers as the applicable series of notes being offered by this prospectus. We will not issue any such additional notes unless the additional notes are fungible with the applicable series of notes being offered hereby for U.S. federal income tax purposes. The notes of each series and any additional notes subsequently issued under the indenture, together with any exchange notes issued in accordance with the registration rights agreement, will be treated as a single series or class for all purposes under the indenture, including, without limitation, waivers, amendments, redemptions and offers to purchase.

The indenture does not limit the amount of debt that we may issue under the indenture, nor the amount of other unsecured debt or securities that we or any of our respective subsidiaries may issue. We may issue debt securities under the indenture from time to time in one or more series, each in an amount authorized prior to issuance. Other than the restrictions contained in the indenture on liens and sale/leaseback transactions described below under “—Certain Covenants,” the indenture does not contain any covenants or other provisions designed to protect holders of the debt securities in the event we participate in a highly leveraged transaction. In addition, the indenture does not limit our ability to guarantee any indebtedness of our subsidiaries or any other person.

No Guarantees of Exchange Notes

The exchange notes are not guaranteed. Prior to completion of the spin-off, each series of outstanding notes was guaranteed on a senior unsecured basis by Marathon Oil. Upon completion of the spin-off as of June 30, 2011, each Marathon Oil guarantee was automatically and unconditionally released and discharged in accordance

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with its terms, and the Trustee and the holders of the outstanding notes were deemed to have consented to such release without any action on the part of the trustee or any holder of the notes. Neither Marathon Oil nor any current or previous affiliate or subsidiary of Marathon Oil or MPC is providing a guaranty of any series of the exchange notes.

Optional Redemption

Except as otherwise described below, the notes of each series will be redeemable in whole at any time or in part from time to time, at our option, prior to the maturity date, in the case of the 2016 notes and the 2021 notes, and prior to September 1, 2040 (six months prior to their maturity date), in the case of the 2041 notes, at a redemption price equal to the greater of:

If the 2041 notes are redeemed on or after September 1, 2040 (six months prior to their maturity date), we will pay a redemption price equal to 100% of the principal amount of the notes redeemed.

In each case, we will pay accrued and unpaid interest on the principal amount being redeemed to the date of redemption.

For purposes of the foregoing discussion of optional redemption, the following definitions are applicable:

“Business Day” means any calendar day that is not a Saturday, Sunday or legal holiday in New York, New York or Findlay, Ohio and on which commercial banks are open for business in New York, New York and Findlay, Ohio.

“Comparable Treasury Issue” means the United States Treasury security selected by an Independent Investment Banker as having a maturity comparable to the remaining term (“Remaining Life”) of the notes to be redeemed that would be utilized, at the time of selection and in accordance with customary financial practice, in pricing new issues of corporate debt securities of comparable maturity to the remaining term of such notes.

“Comparable Treasury Price” means, with respect to any redemption date, (1) the average of the Reference Treasury Dealer Quotations for such redemption date, after excluding the highest and lowest Reference Treasury Dealer Quotations, or (2) if the Trustee obtains fewer than four such Reference Treasury Dealer Quotations, the average of all such quotations.

“Independent Investment Banker” means one of the Reference Treasury Dealers that we appoint to act as the Independent Investment Banker from time to time.

“Reference Treasury Dealer” means each of Morgan Stanley & Co. Incorporated, J.P. Morgan Securities LLC, and two additional dealers in U.S. Government securities selected by us (each a “Primary Treasury Dealer”) and their respective successors which we specify from time to time; provided, however, that if any of them ceases to be a Primary Treasury Dealer, we will substitute therefor another Primary Treasury Dealer.

“Reference Treasury Dealer Quotations” means, with respect to each Reference Treasury Dealer and any redemption date, the average, as determined by the Trustee, of the bid and asked prices for the Comparable Treasury Issue (expressed in each case as a percentage of its principal amount) quoted in writing to the Trustee by such Reference Treasury Dealer at 5:00 p.m., New York City time, on the third Business Day preceding such redemption date.

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“Treasury Rate” means, with respect to any redemption date, the rate per year equal to: (1) the yield, under the heading which represents the average for the immediately preceding week, appearing in the most recently published statistical release designated “H.15(519)” or any successor publication which is published weekly by the Board of Governors of the Federal Reserve System and which establishes yields on actively traded United States Treasury securities adjusted to constant maturity under the caption “Treasury Constant Maturities,” for the maturity corresponding to the Comparable Treasury Issue; provided that, if no maturity is within three months before or after the Remaining Life of the notes to be redeemed, yields for the two published maturities most closely corresponding to the Comparable Treasury Issue shall be determined and the Treasury Rate shall be interpolated or extrapolated from those yields on a straight-line basis, rounding to the nearest month; or (2) if such release (or any successor release) is not published during the week preceding the calculation date or does not contain such yields, the rate per year equal to the semiannual equivalent yield to maturity of the Comparable Treasury Issue, calculated using a price for the Comparable Treasury Issue (expressed as a percentage of its principal amount) equal to the Comparable Treasury Price for such redemption date. The Treasury Rate shall be calculated on the third Business Day preceding the redemption date.

Notice of redemption will be mailed at least 30 but not more than 60 days before the redemption date to each holder of record of the notes to be redeemed at its registered address. The notice of redemption for the notes will state, among other things, the series and amount of notes to be redeemed, the redemption date, the redemption price and the place or places that payment will be made upon presentation and surrender of notes to be redeemed. Unless we default in the payment of the redemption price, interest will cease to accrue on any notes that have been called for redemption at the redemption date. If fewer than all of the notes of a series are to be redeemed at any time, the Trustee will select, not more than 45 days prior to the redemption date, the particular notes or portions thereof for redemption from the outstanding notes not previously called by such method as the Trustee deems fair and appropriate.

Repurchase at the Option of Holders on Certain Changes of Control

If a Change of Control Repurchase Event (as defined below) with respect to a series of notes occurs after the spin-off, unless we have exercised our right to redeem the notes of such series as described above, we will make an offer to each holder of notes of such series to repurchase all or any part (equal to $1,000 or an integral multiple of $1,000 in excess thereof) of that holder’s notes of such series at a repurchase price in cash equal to 101% of the aggregate principal amount of notes repurchased plus any accrued and unpaid interest on the notes repurchased to the date of purchase. Within 30 days following any Change of Control Repurchase Event or, at our option, prior to any Change of Control (as defined below), but after the public announcement of the transaction or event that constitutes or may constitute the Change of Control, we will mail a notice to each holder to which we are required to make a repurchase offer as described above, with a copy to the Trustee, describing the transaction or event that constitutes or may constitute the Change of Control Repurchase Event and offering to repurchase the notes of the applicable series on the payment date specified in the notice, which date will be no earlier than 30 days and no later than 60 days from the date such notice is mailed. The notice may, if mailed prior to the date of consummation of the Change of Control, state that the offer to purchase is conditioned on the Change of Control Repurchase Event occurring on or prior to the payment date specified in the notice.

We will be required to comply with the requirements of Rule 14e-1 under the Exchange Act and any other securities laws and regulations thereunder, to the extent those laws and regulations are applicable in connection with the repurchase of the notes as a result of a Change of Control Repurchase Event. To the extent that the provisions of any securities laws or regulations conflict with the Change of Control Repurchase Event provisions of the notes, we will be required to comply with the applicable securities laws and regulations and will not be deemed to have breached our obligations under the Change of Control Repurchase Event provisions of the notes by virtue of any such conflict.

On the Change of Control Repurchase Event payment date, we will be required, to the extent lawful, to:

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The paying agent will promptly mail to each holder of notes properly tendered and not withdrawn the purchase price for such notes, and the Trustee will promptly authenticate and mail (or cause to be transferred by book-entry) to each holder a new note equal in principal amount to any unpurchased portion of any such notes surrendered; provided, that each new note will be in a minimum principal amount of $2,000 or an integral multiple of $1,000 in excess thereof.

We will not be required to make an offer to repurchase the notes upon a Change of Control Repurchase Event if a third party makes such an offer in the manner, at the times and otherwise in compliance with the requirements for an offer made by us and such third party purchases all notes properly tendered and not withdrawn under its offer.

We could, in the future, enter into certain transactions, including acquisitions, refinancings or other recapitalizations, that would not constitute a Change of Control, but that could increase the amount of indebtedness outstanding at such time or otherwise materially adversely affect our capital structure or credit ratings.

The Change of Control purchase feature of the notes may, in certain circumstances, make more difficult or discourage a takeover of us and, thus, the removal of incumbent management. The Change of Control purchase feature, however, is not the result of management’s knowledge of any specific effort to accumulate shares of our common stock or to obtain control of us by means of a merger, tender offer, solicitation or otherwise, or part of a plan by management to adopt a series of anti-takeover provisions.

Definitions

“Below Investment Grade Rating Event” means, with respect to each series of the notes, the rating on the notes is lowered by each of the Rating Agencies, and the notes are rated below Investment Grade by each of the Rating Agencies, within 60 days from the earlier of (1) the date of the public notice of an arrangement that could result in a Change of Control or (2) the occurrence of a Change of Control (which period shall be extended so long as the rating of the notes is under publicly announced consideration for possible downgrade by any of the Rating Agencies).

“Change of Control” means the occurrence of any of the following after consummation of the spin-off:

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Notwithstanding the foregoing, a transaction will not be considered to be a Change of Control under clause (2) above if (a) we become a direct or indirect wholly owned subsidiary of a holding company and (b) (y) immediately following that transaction, the direct or indirect holders of the Voting Stock of the holding company are substantially the same as the holders of our Voting Stock immediately prior to that transaction or (z) immediately following that transaction, no person (as that term is used in Section 13(d)(3) of the Exchange Act), other than a holding company satisfying the requirements of this sentence, is the beneficial owner, directly or indirectly, of more than 50% of the Voting Stock of the holding company.

The indenture defines “substantially all of our assets” as a portion of the non-current assets reflected in MPC’s consolidated balance sheet as of the end of the most recent quarterly period that represents at least 66 ²/3% of the total reported value of such assets.

“Change of Control Repurchase Event” means the occurrence of both a Change of Control and a Below Investment Grade Rating Event.

“Continuing Directors” means, as of any date of determination, any member of our Board of Directors who (1) was a member of such Board of Directors on the date of the consummation of the spin-off; or (2) was nominated for election, elected or appointed to such Board of Directors with the approval of a majority of the Continuing Directors who were members of such Board of Directors at the time of such nomination, election or appointment (either by a specific vote or by approval of our proxy statement in which such member was named as a nominee for election as a director).

Under a recent Delaware Chancery Court interpretation of the foregoing definition of “Continuing Directors,” our Board of Directors could approve, for purposes of such definition, a slate of stockholder-nominated directors without endorsing them, or while simultaneously recommending and endorsing its own slate instead. Accordingly, under such interpretation, our Board of Directors could approve a slate of directors that includes a majority of dissident directors nominated pursuant to a proxy contest, and the ultimate election of such dissident slate would not constitute a “Change of Control Repurchase Event” that would trigger a holder’s right to require us to repurchase the holder’s notes as described above.

“Fitch” means Fitch Ratings Ltd. and its successors.

“Investment Grade” means a rating of BBB- or better by Fitch (or its equivalent under any successor rating categories of Fitch), Baa3 or better by Moody’s (or its equivalent under any successor rating categories of Moody’s) and a rating of BBB- or better by S&P (or its equivalent under any successor rating categories of S&P) or the equivalent investment grade credit rating from any additional Rating Agency or Rating Agencies selected by us.

“Moody’s” means Moody’s Investors Services Inc. and its successors.

“Rating Agency” means (1) each of Fitch, Moody’s and S&P; and (2) if any of Fitch, Moody’s or S&P ceases to rate the notes or fails to make a rating of the notes publicly available for reasons outside of our control, a “nationally recognized statistical rating organization” within the meaning of Section 3(a)(62) of the Exchange Act, selected by us as a replacement agency for Fitch, Moody’s or S&P, or all of them, as the case may be.

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“S&P” means Standard & Poor’s Ratings Services, a division of McGraw-Hill, Inc., and its successors.

“Voting Stock” means, with respect to any person as of any date, capital stock of any class or kind the holders of which are ordinarily, in the absence of contingencies, entitled to vote for the election of directors (or persons performing similar functions) of such person, even if the right so to vote has been suspended by the happening of such a contingency.

Open Market Purchases

MPC or any of its affiliates may at any time and from time to time purchase notes in the open market or otherwise.

Sinking Fund

There is no provision for a sinking fund for any of the notes.

Ranking

The notes will be unsecured and unsubordinated obligations of MPC and will rank equally with all its other existing and future unsecured and unsubordinated indebtedness, including under the revolving credit facility we entered into in connection with the spin-off.

MPC is a recently formed corporation. We derive substantially all of our operating income from, and hold substantially all of our assets through, our subsidiaries. We depend on distributions of cash flow and earnings from our subsidiaries in order to meet our payment obligations under the notes and our other debt obligations. These subsidiaries are separate and distinct legal entities and will have no obligation to pay any amounts due on our debt securities, including the notes, or to provide us with funds for our payment obligations, whether by dividends, distributions, loans or otherwise. As a result, the notes will be structurally subordinated to the liabilities of our subsidiaries, including trade payables. In addition, provisions of applicable law, such as those limiting the legal sources of dividends, could limit the ability of our subsidiaries to make payments or other distributions to us and our subsidiaries could agree to contractual restrictions on their ability to make distributions. As of June 30, 2011, our consolidated subsidiaries had approximately $283 million of indebtedness. Our consolidated indebtedness, as of June 30, 2011 was $3.274 billion. In addition, effective upon the consummation of the spin-off on June 30, 2011, we entered into a revolving credit facility with a borrowing capacity of up to $2.0 billion.

Certain Covenants

Creation of Certain Liens

If MPC or any subsidiary of MPC mortgages or encumbers as security for money borrowed any crude oil refinery which (1) is located in the United States and (2) is determined to be a principal property by MPC’s board of directors in its discretion, MPC will, or will cause such subsidiary to, secure each series of notes and all other debt securities issued under the indenture equally and ratably with all obligations secured by the mortgage then being given. This covenant will not apply in the case of any mortgage:

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In addition, MPC may, and may permit its subsidiaries to, grant mortgages or incur liens on property covered by the restriction described above as long as the net book value of the property so encumbered, together with all property subject to the restriction on sale and leaseback transactions described below, does not, at the time such mortgage or lien is granted, exceed 15% of our “Consolidated Net Tangible Assets,” which the indenture defines to mean the aggregate value of all assets of MPC and its subsidiaries after deducting:

all determined in conformity with generally accepted accounting principles and calculated on a basis consistent with our most recent audited consolidated financial statements.

Limitations on Certain Sale and Leaseback Transactions

MPC and its subsidiaries are generally prohibited from selling and leasing back the principal properties described above under “—Creation of Certain Liens.” However, this covenant will not apply if: