| abstract |
The present invention includes a viscosity index improver (A) containing a comb polymer together with a base oil and having an SSI (shear stability index) of 30 or less, and an HTHS viscosity at 150 ° C. (high temperature high shear viscosity) (T150). Is 1.6 to 2.9 mPa · s, and the ratio (V40 / T150) of the kinematic viscosity (V40) [mm2 / s] at 40 ° C. to the HTHS viscosity (T150) [mPa · s] at 150 ° C. A lubricating oil composition is provided wherein is 12.4 or less. The lubricating oil composition of the present invention is excellent in fuel saving performance under a low temperature region assumed at the time of starting the engine, while improving various properties such as viscosity under a high temperature region assumed at the time of high speed operation of the engine. |