Oil engine

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