HOUSTON, TX - August 13, 2008 - Marathon Oil Corporation (NYSE: MRO) today announced that it has released its "2007 Living Our Values Corporate Social Responsibility Report." This report provides information on the Company's non-financial performance and its actions to promote sustainable social, environmental and economic benefits.

"At Marathon, we strive to embed our values into every aspect of our business. Our values, in fact, have made it possible for us to conceive, plan, execute and manage a wide range of operations and projects worldwide," said Clarence P. Cazalot, Jr., Marathon president and CEO. "These values - health and safety, environmental stewardship, honesty and integrity, corporate citizenship, and a high performance team culture - align with the execution of our business strategy to deliver energy solutions around the world."

The "2007 Living Our Values Corporate Social Responsibility Report" is based on the Oil & Gas Industry Guidance on Voluntary Sustainability Reporting, published jointly by the International Petroleum Industry Environmental Conservation Association (IPIECA) and the American Petroleum Institute (API). The IPIECA/API Guidance provides a common framework for the petroleum industry to use in reporting non-financial performance. Marathon has included quantitative metrics and descriptions of policies, programs and practices to provide relevant and meaningful information about these non-financial elements of the Company's business.

An electronic copy of the Company's "2007 Living Our Values Corporate Social Responsibility Report" is available on Marathon's Web site at www.marathon.com. To receive a hard copy of the report, please email CSRReport@marathonoil.com.

About Marathon Oil

Marathon is an integrated international energy company engaged in exploration and production; oil sands mining; integrated gas; and refining, marketing and transportation operations. Marathon has principal operations in the United States, Angola, Canada, Equatorial Guinea, Gabon, Indonesia, Ireland, Libya, Norway and the United Kingdom. Marathon is the fourth largest United States-based integrated oil company and the nation's fifth largest refiner.

Marathon Oil Corporation

Marathon Oil Corporation

Marathon is an integrated international energy company engaged in exploration and production; oil sands mining; integrated gas; and refining, marketing and transportation operations. Marathon has principal operations in the United States, Angola, Canada, Equatorial Guinea, Gabon, Indonesia, Ireland, Libya, Norway and the United Kingdom. Marathon is the fourth largest United States-based integrated oil company and the nation's fifth largest refiner. Living Our Values guides the Company's approach to managing its business--what it believes in, how it behaves, what it invests in, and the projects and issues it influences and promotes. Marathon's actions, decision and operations must be consistent with the letter and spirit of its commitment to health and safety, environmental stewardship, honesty and integrity corporate citizenship, and a high performance team culture.

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