Tesoro Crude Supply Not Impacted Over Near Term; Company's Alaska Refinery Unaffected by BP Pipeline Shutdown.

SAN ANTONIO -- Tesoro (NYSE:TSO) today stated that its current operations are not impacted by the BP pipeline shutdown since only 10 percent of its total crude supply comes from Alaska's Prudhoe Bay. In addition to other Alaskan crude sources such as Cook Inlet and Alpine field, Tesoro has multiple foreign sources to meet its crude supply requirements.

For the next 30 to 45 days, Tesoro has a secure crude supply for its two refineries, Golden Eagle in Martinez, Calif., and Anacortes in Anacortes, Wash., that run crude from the affected field. Tesoro's Kenai refinery in Alaska and Kapolei refinery in Hawaii do not currently source crude from Prudhoe Bay.

The Company has been focused on its crude flexibility and lessening its dependence on any single type of crude. "We have introduced more than 50 different crude grades into our system over the past two years, so we are in a position to source crudes from all over the world," said Bill Finnerty, Executive Vice President and COO. "We believe our crude flexibility is a strategic advantage for our refinery system, especially in a situation like we are seeing today."

The Company will continue to assess the Alaska North Slope crude supply and adjust supply patterns as necessary.

About Tesoro

Tesoro Corporation, a Fortune 200 company headquartered in San Antonio, Texas, is an independent refiner and marketer of petroleum products. Tesoro operates six refineries in the western United States with a combined crude oil capacity of more than 560,000 barrels per day. Tesoro's retail marketing system includes over 460 branded retail stations, of which over 200 are company operated under the Tesoro(R) and Mirastar(R) brands. Tesoro's commercial marketing system includes sales of jet fuel and marine fuels.

This news release contains certain statements that are "forward-looking" statements within the meaning of Section 27A of the Securities Act of 1933 and Section 21E of the Securities Exchange Act of 1934. These forward-looking statements contain expectations concerning our crude supply. Factors which can cause actual results to differ from these forward-looking statements include changes in the cost of crude oil and, other feedstocks or refined product and other factors beyond our control. For more information concerning these factors and other factors that could cause such a difference, see our annual report on Form 10-K and quarterly reports on Form 10-Q, filed with the Securities and Exchange Commission. We undertake no obligation to publicly release the result of any revisions to any such forward-looking statements that may be made to reflect events or circumstances that occur, or which we become aware of, after the date hereof.