Lubricating oil composition for internal combustion engine

Abstract

A lubricating oil composition for an internal combustion engine, having (A) a lubricating base oil, (B) magnesium salicylate, (C) calcium salicylate, and (D) a viscosity index improver, wherein the lubricating oil composition has an HTHS viscosity at 150° C. of 1.7 mPa·s or more and 2.3 mPa·s or less, and an HTHS viscosity at 100° C. of 4.8 mPa·s or less, can provide a lubricating oil composition for an internal combustion engine provided with high fuel-saving performance.

1 . A lubricating oil composition for an internal combustion engine, comprising:
 (A) a lubricating base oil;   (B) magnesium salicylate;   (C) calcium salicylate; and   (D) a viscosity index improver, wherein   the lubricating oil composition has an HTHS viscosity at 150° C. of 1.7 mPa·s or more and 2.3 mPa·s or less, and an HTHS viscosity at 100° C. of 4.8 mPa·s or less.   
     
     
         2 . The lubricating oil composition for an internal combustion engine according to  claim 1 , wherein
 the lubricating base oil (A) has a kinematic viscosity at 100° C. of less than 4.2 mm 2 /s, and   the lubricating oil composition has a viscosity index of 140 or more.   
     
     
         3 . The lubricating oil composition for an internal combustion engine according to  claim 1 , wherein
 a total content of the magnesium salicylate (B) and the calcium salicylate (C) is 1400 mass ppm or more and 2000 mass ppm or less in terms of metal amount, based on a total amount of the lubricating oil composition, and   [the content of (B)/(the content of (B)+the content of (C))] is 0.05 to 0.95 in terms of mass ppm.   
     
     
         4 . The lubricating oil composition for an internal combustion engine according to  claim 1 , wherein
 the lubricating oil composition has an HTHS viscosity at 150° C. of 1.7 mPa·s or more and 2.0 mPa-s or less, and an HTHS viscosity at 100° C. of 4.2 mPa-s or less.   
     
     
         5 . The lubricating oil composition for an internal combustion engine according to  claim 2 , wherein
 a total content of the magnesium salicylate (B) and the calcium salicylate (C) is 1400 mass ppm or more and 2000 mass ppm or less in terms of metal amount, based on a total amount of the lubricating oil composition, and   [the content of (B)/(the content of (B)+the content of (C))] is 0.05 to 0.95 in terms of mass ppm.   
     
     
         6 . The lubricating oil composition for an internal combustion engine according to  claim 2 , wherein
 the lubricating oil composition has an HTHS viscosity at 150° C. of 1.7 mPa·s or more and 2.0 mPa·s or less, and an HTHS viscosity at 100° C. of 4.2 mPa·s or less.   
     
     
         7 . The lubricating oil composition for an internal combustion engine according to  claim 3 , wherein
 the lubricating oil composition has an HTHS viscosity at 150° C. of 1.7 mPa·s or more and 2.0 mPa·s or less, and an HTHS viscosity at 100° C. of 4.2 mPa·s or less.   
     
     
         8 . The lubricating oil composition for an internal combustion engine according to  claim 5 , wherein
 the lubricating oil composition has an HTHS viscosity at 150° C. of 1.7 mPa·s or more and 2.0 mPa·s or less, and an HTHS viscosity at 100° C. of 4.2 mPa·s or less.