| abstract |
To provide a lubricating oil composition for an internal combustion engine that reduces noise during traveling, suppresses fatigue damage such as gear pitching, reduces oil consumption, and has good fuel economy even at low viscosity. It is intended to provide. A base oil having a viscosity index of 125 or more and a Noack evaporation (250 ° C. × 1 h) of 15% by mass or less, based on the total amount of the composition, (A) a mass average molecular weight of 500 to 10,000. 0.1 to 10% by mass of the following olefin polymer having 2 to 20 carbon atoms and / or (B) a polymer compound having a mass average molecular weight of 10,000 or more and less than 100,000, (C) A lubricating oil composition for an internal combustion engine, wherein the blending amount of the polymer compound having a mass average molecular weight of 100,000 or more is less than 1.0% by mass. [Selection figure] None |