Cross Oil Refining & Marketing Inc. and Process Oils Inc., an Ergon company, entered into an offtake and marketing agreement effective Aug. 23, through which Process Oils will serve as the exclusive marketer and seller of Cross Oil’s Corsol, L-Series, B-Series, CrossTrans and Ebonite naphthenic base oils produced from Martin Operating Partnership L.P.’s Smackover, Arkansas, refinery.