Lubricating oil composition for internal combustion engine

Abstract

The invention provides a lubricating oil composition for internal combustion engines, containing a base oil composition containing a GTL base oil as a main component, and having % Cn of 14 to 25% and an aniline point of 120 to 126° C., and a comb-like polymethacrylate based viscosity index improver having a weight average molecular weight (Mw) of 400,000 or more, wherein a N sulfur content is 0.3 mass % or less based on a total weight of the lubricating oil composition.

1 . A lubricating oil composition for internal combustion engines, comprising:
 a base oil composition containing a GTL base oil as a main component, and   having % Cn of 14 to 25% and aniline point of 120 to 126° C.; and   a comb-like polymethacrylate based viscosity index improver having a weight average molecular weight (Mw) of 400,000 or more,   
       wherein, a sulfur content is 0.3 mass % or less based on the total weight of the lubricating oil composition. 
     
     
         2 . The lubricating oil composition for internal combustion engines according to  claim 1 , wherein a kinematic viscosity at 100° C. of the base oil composition is 3.5 to 8 mm2/s. 
     
     
         3 . The lubricating oil composition for internal combustion engines according to  claim 1 , wherein an SAE viscosity grade is 0W-20 or 5W-20 and a viscosity index is 180 or more, or the SAE viscosity grade is 5W-30 and the viscosity index is 220 or more. 
     
     
         4 . The lubricating oil composition for internal combustion engines according to  claim 1 , wherein a viscosity index of the base oil composition is 120 or more. 
     
     
         5 . The lubricating oil composition for internal combustion engines according to  claim 1 , wherein the base oil composition contains a GTL base oil and a base oil belonging to Group II of API classification.