| abstract |
A lubricant oil composition according to the present invention comprises: a lubricant base oil whose kinematic viscosity at 100° C. is 1 to 20 mm 2 /s; and a viscosity index improver in which a ratio M1a/M2a of a total area M1a of peaks in a chemical shift between 29-31 ppm to a total area M2a of peaks in a chemical shift between 64-69 ppm based on a total area of all the peaks is not less than 10 in a spectrum obtained by 13 C-NMR. |