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A coker or coker unit is an oil refinery processing unit that converts the residual oil from the vacuum distillation column or the atmospheric distillation column into gasoline or diesel fuel and green coke. View of Shell Oil Refinery in Martinez, California. ... Natural olive oil Synthetic motor oil Oil, in a general sense, is a chemical compound that is not miscible with water, and is in a liquid state at ambient temperatures. ... This article or section does not cite its references or sources. ... Gasoline, also called petrol, is a petroleum-derived liquid mixture consisting primarily of hydrocarbons and enhanced with benzenes to increase octane ratings, used as fuel in internal combustion engines. ... This article is about the fuel. ... Coke is a solid carbonaceous residue derived from low-ash, low-sulfur bituminous coal. ...