Diesel Fuel 4
Diesel Fuel 4 : A general term covering oils used as fuel in diesel and other compression ignition engines. This term usually applies to fuels suitable for those engines of the industrial and marine type which have a low or medium rotational speed, and which are not so critical of fuel quality as are high-speed engines. Fuels for the latter need special descriptions, e. g. High-Speed Diesel Fuel, Automotive Gas Oil, or DERV Fuel. (Inst. of Petroleum definition)