LUBRICANT COMPOSITION

摘要

The present invention provides a lubricating oil composition that is a lubricating oil composition with a 150° C. HTHS viscosity of less than 2.6 mPa·s and can be reduced sufficiently in the 40° C. kinematic viscosity, 100° C. kinematic viscosity and 100° C. HTHS viscosity and suppress the increase of the friction coefficient in a boundary lubrication region and has excellent fuel saving properties. The lubricating oil composition comprises a lubricating base oil with a 100° C. kinematic viscosity of 1 to 5 mm2/s; (A) a viscosity index improver with a weight average molecular weight of 400,000 or less and a PSSI of 20 or less; (B) an overbasic metallic detergent with a metal ratio of 3.4 or less; and (C) a friction modifier, and having a 150° C. HTHS viscosity of lower than 2.6 mPa·s.