"Fuel oil or heavy oil is a fraction obtained from petroleum distillation, either as a distillate or a residue. Broadly speaking, fuel oil is any liquid fuel that is burned in a furnace or boiler for the generation of heat or used in an engine for the generation of power, except oils having a flash point of approximately 40 \u00B0C (104 \u00B0F) and oils burned in cotton or wool-wick burners. In this sense, diesel is a type of fuel oil."@en . . .