In business for more than 70 years, the Supreme Oil Company is one of the leading distributors of refined petroleum products in Western United States. Based in Phoenix, Ariz., the company offers a variety of bulk fueling options, biodiesel supply/distribution and lubricant product lines. It provides fleet fueling options through its cardlock networks. The company offers supply/distribution of biodiesel in California and Arizona with product storage facilities in both locations. The Supreme Oil Company also distributes products from various brands, including Valero, Mobil and Exxon, to name a few.