Sinclair Trucking Company provides distribution and transportation services for gas, diesel, jet fuel, fuel oils, liquefied petroleum gas and asphalt. It maintains a staff of drivers, mechanics and support personnel. Sinclair Trucking Company is a part of Sinclair Oil Corporation, which is one of the largest oil companies in the United States. It owns and operates several refineries in Wyoming and Oklahoma. The company supplies fuel to more than 2,600 companies and distributor-operated stations in over 20 states. Established in 1916, Sinclair Oil Corporation is engaged in oil and gas exploration. It maintains a staff of geologists, geophysicists, engineers and petroleum landmen. The company provides the Fleet Track Program for transportation companies. Sinclair Oil Corporation also offers distributor and carrier services.