Tesoro and its subsidiaries are dedicated to refining and marketing petroleum products in the United States. The company operates two major businesses: refining and retail. The refining business mainly manufactures and sells gasoline and gasoline blends, jet fuel, diesel fuel and heavy oil for commercial users in the central and western United States. The business also involves natural gas liquefaction, petroleum coke and asphalt manufacturing. The retail business involves the distribution of engine fuel to wholesalers and retail customers, as well as sales to commercial end-users through a network of gas stations, mainly named "Tesoro" and "mirastar". In addition, the company sells gasoline and diesel fuel to retail customers in the central and western United States through its retail outlets and franchise stores. As of December 31, 2006, Tesoro operates 460 retail outlets, including 194 direct retail outlets and 266 franchise stores. Tesoro oil was founded in 1939. In 2004, the company name was changed from Tesoro Petroleum Corporation to Tesoro Corporation.
Tesoro Petroleum Corp., headquartered in San Antonio, Texas, is an independent oil processing and marketing company.
Tesoro oil company is a seller of petroleum products, with independent refineries. Its business is divided into three categories: refineries manufacture all kinds of products, such as gasoline, diesel, aircraft fuel, etc.; retail business sells gasoline through the gas station network; ocean service business sells all kinds of petroleum products and chemical products, and drilling for oil in the Gulf of Mexico and on land Provide related services.