Sterling Oil Co, 180 Cook St, Denver, CO 80206, US

Frontier Refining & Marketing is a subsidiary of Frontier Oil Corporation, an independent oil refining and marketing company with refineries located in Wyoming and Kansas. The company s products include various grades of gasoline, diesel fuel, jet fuel, chemicals and petroleum coke. Its primary products of gasoline, diesel and asphalt are marketed in the Rocky Mountain and Plains States. Frontier Oil Corporation sells most of its gasoline and diesel to unbranded jobbers, but also has supply arrangements to retail operations of other oil companies, such as CITGO Petroleum. The company is also one of the major marketers of asphalt in Colorado and Grand Island, Neb. Frontier Refining & Marketing is located in Denver.

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