LUBRICATING OIL COMPOSITION

摘要

The invention provides a lubricating oil composition comprising a lubricating base oil with a kinematic viscosity at 100°C of 1-10 mm 2 /s, a %C p of 70 or greater and a %C A of no greater than 2, wherein the proportion of said lubricating base oil is at least 30% by mass based on the total amount of base oil, and a poly(meth)acrylate-based viscosity index improver having a weight-average molecular weight of 100,000 or greater and a ratio of weight-average molecular weight to PSSI of 5.0 × 10 4 or greater, at 0.1-50% by mass based on the total amount of the composition. The lubricating oil composition has a kinematic viscosity at 100°C of 9.0-12.5 mm 2 /s and a HTHS viscosity at 150°C of 2.8 mPa·s or greater.