Crude oil engine

The crude oil engine is a type of internal combustion engine similar to the hot bulb engine. A crude oil engine could be driven by all sorts of oils such as engine waste oil and vegetable oils. Anything could be used as fuel, even peanut oil and butter if it was necessary. Like hot bulb engines, crude oil engines were mostly used as stationary engines or in boats. They can run for a very long time, for instance at the world fair in Milano in 1907, a FRAM engine was started and it wasn't stopped until the exhibition was over one month later. A crude oil engine is a low RPM engine dimensioned for constant running and can last for a very long time if maintained properly.

It was later replaced by the diesel engine.