Lubricating oil composition containing a polymethacrylate VI improver

摘要

To provide a fuel-efficient lubricating oil composition, particularly suitable for internal combustion engines, which has a reduced shear viscosity in an intermediate temperature range from 80 to 100°C, an effective temperature range for reducing fuel consumption. The present invention provides a lubricating oil composition comprising a base oil incorporated with a viscosity index improver, wherein the viscosity index improver has a peak area at a chemical shift between 3.4 and 3.7 ppm in a spectral pattern observed by nuclear magnetic resonance analysis ( 1 H-NMR) accounts for 5% or more of the total peak area.