Amerada Hess
The Leading Independent Energy Company, The Natural Choice for Natural Gas

Ashland, Inc.
Ashland, Marathon, Valvoline

BP Amoco Company
BP Amoco Plc is one of the world's leading energy and petrochemical groups. We provide energy from oil, gas and solar power and produce petrochemicals for plastics, fibers and fabrics

Conoco
A major energy producer with revenues of $27 billion and operations in more than 40 countries.

Exxon Mobil Corporation
Exxon Corporation and Mobil Corporation formally merged to form Exxon Mobil Corporation. Headquartered in Irving, Texas, ExxonMobil is a worldwide leader in the petroleum and petrochemicals business.

Premcor
Premcor is the fifth largest independent oil refiner and the eleventh largest U.S. refiner with over 540,000 barrels per day of throughput capacity through four refineries--Blue Island, Hartford, Lima, and Port Arthur

Sinclair Oil
Sinclair operates three of the most up-to-date refineries in western America, supplying customers the highest quality
Sinclair gasolines, diesel fuel, and jet fuel