Oil engine may refer to:

Hornsby-Akroyd oil engine, the first internal combustion engine using heavy oil as fuel Crude oil engine, an internal combustion engine which can use many kinds of oil as fuel Oil burner (engine), a steam engine that uses oil as its fuel Hot bulb engine Hesselman engine Some forms of internal combustion engine, so called during an early period in their development

See also Diesel engine

nn:Råoljemotor