Patent ID: 9688941
Date: 2017-06-27
CPC Classifications: C10M,C10N

Claim:
1. A lubricating oil composition, comprising: (A) a base oil having a pour point of lower than −40° C., a kinematic viscosity at 80° C. of from 2.0 to 2.7 mm (B-1) from 1 to 7.67% by mass of a polymethacrylate having a weight-average molecular weight of from 10,000 to less than 50,000; and (B-2) from 0.1 to 5% by mass of a polymethacrylate having a weight-average molecular weight of from 140,000 to 200,000, which comprises from 6.0 to 9.8% by mass in a total amount of the component (B-1) and the component (B-2) in the lubricating oil composition, wherein the lubricating oil composition has a NOACK value of 12 wt % or less; a viscosity reduction rate in the ultrasonic shearing stability test of 18% or less; and a BF viscosity at −40° C. of 600 mPa·s or less.