Filed Pursuant to Rule 433
Issuer Free Writing Prospectus dated March 11, 2009
Registration No. 333-157824
March 11, 2009
||Plan Participants in the Marathon Oil Corporation Dividend Reinvestment
and Direct Stock Purchase Plan
Ladies and Gentlemen:
Thank you for your participation in the Marathon Oil Corporation Dividend Reinvestment and Direct
Stock Purchase Plan (the Plan). In November 2008, we notified you that the Plan had been
temporarily suspended. This letter is to notify you that we have reinstituted the Plan, as amended
and restated, effective March 10, 2009. No action is required from you unless you wish to change
your elections. If you wish to change your participation or have other questions regarding this
notice, please contact the plan administrator, National City Bank, at 1-888-843-5542. Unless you
change your elections or we otherwise notify you, automatic monthly bank withdrawals will begin in
April 2009, and cash investments will be accepted starting April 1, 2009.
dividends payable on March 10, 2009 to holders of record on
February 18, 2009, you will receive a check in lieu of your
dividends being reinvested pursuant to the terms of the Plan. We expect our second quarter 2009 dividend, if
and when declared, will be eligible for reinvestment under the Plan.
The Plan prospectus is enclosed and we encourage you to read it carefully, including the risks
described under Risk Factors.
If you have other comments or suggestions, please contact our Investor Relations Department at
Very truly yours,
/s/ Janet F. Clark
Janet F. Clark
Executive Vice President and Chief Financial Officer
The issuer has filed a registration statement (including a prospectus) with the SEC for the
offering to which this communication relates. Before you invest, you should read the prospectus in
that registration statement and other documents the issuer has filed with the SEC for more complete
information about the issuer and this offering. You may get these documents for free by visiting
EDGAR on the SEC Web site at www.sec.gov. Alternatively, the issuer will arrange to send you the
prospectus if you request it by calling toll-free 1-888-843-5542.