| abstract |
Provided is a fuel-efficient engine oil composition that has excellent fuel efficiency and good abrasion resistance. Said fuel-efficient engine oil composition is characterized by containing, in a lubricant base oil: a diol compound represented by general formula (1), in the amount of 0.1-2.0% by mass; and phosphorus in the form of zinc dithiophosphate (ZnDTP), in the amount of 0.03-0.12% by mass. The fuel-efficient engine oil composition is further characterized in that the phosphorus content of ZnDTP that has secondary alkyl groups constitutes at least 50% by mass of the ZnDTP-derived phosphorus content. (1) (In the formula, R represents hydrogen, an alkyl group, or an alkenyl group.) |