Motor Oil 1 : A refined lubricating oil suitable for use as a lubricant in internal combustion engines. May be a distillate oil or a blend of distillate oil with a bright stock. (Inst. Pet. defn)
H. J. Porter (Chairman - Technical Committee), Dictionary of Fire Technology, The Institution of Fire Engineers, The Victory Press (Leicester) Ltd. 1979 UK. (Fr Tech - Brit) {81}