Big West Oil, LLC | 2,855 followers on LinkedIn. Committed to being a top-tier refiner, marketer, and employer in the Rocky Mountain Region. | Located in North Salt Lake City, Utah, is a complex high-conversion refinery operated by Big West Oil LLC, a wholly owned subsidiary of FJ Management Inc. The facility employs about 250 people and supplies fuel products to many select customers in seven western states. This sophisticated facility has a total capacity of 35,000 barrels per day (over one million gallons) and refines a combination of Utah, Wyoming, and Canadian crude oils into high-quality motor fuels and other specialty chemicals.