Lubricating oil composition

Abstract

Provided is a lubricating oil composition containing: a base oil (A); and a metal-based detergent (B), wherein a content proportion of heavy fraction (Hf) having 32 or more carbon atoms in the component (A) is 14.0 mass % or more based on the total amount of the component (A), the component (B) contains an overbased calcium salicylate (B1) with a base number of 100 mg KOH/g or more, and a content proportion of the component (B1) in the component (B) is 35.0 mass % or more based on the total amount of the component (B).

1 . A lubricating oil composition comprising: a component (A) which is a base oil; and a component (B) which is a metal-based detergent,
 wherein a content proportion of a heavy fraction (Hf) having 32 or more carbon atoms in the component (A) is 14.0 mass % or more based on a total amount of the component (A),   the component (B) comprises an overbased calcium salicylate (B1) with a base number of 100 mg KOH/g or more, and   a content proportion of the component (B1) in the component (B) is 35.0 mass % or more based on a total amount of the component (B).   
     
     
         2 . The lubricating oil composition according to  claim 1 , wherein a content ratio by mass of a light fraction (Lf) having 21 or less carbon atoms to the heavy fraction (Hf) having 32 or more carbon atoms in the component (A), [(Lf)/(Hf)], is 0.05 or more. 
     
     
         3 . The lubricating oil composition according to  claim 1 , wherein a content proportion of a light fraction (Lf) having 21 or less carbon atoms in the component (A) is 1.0 mass % or more based on the total amount of the component (A). 
     
     
         4 . The lubricating oil composition according to  claim 1 , wherein a content of the component (B1) in terms of calcium atoms is 0.01 to 0.80 mass % based on a total amount of the lubricating oil composition. 
     
     
         5 . The lubricating oil composition according to  claim 1 , wherein a content of the component (B) in terms of metal atoms is 0.01 to 1.00 mass % based on a total amount of the lubricating oil composition. 
     
     
         6 . The lubricating oil composition according to  claim 1 , further comprising a component (C) which is a viscosity index improver. 
     
     
         7 . The lubricating oil composition according to  claim 1 , wherein a kinematic viscosity of the lubricating oil composition at 40° C. is 50.0 mm 2 /s or less. 
     
     
         8 . The lubricating oil composition according to  claim 1 , wherein a viscosity index of the lubricating oil composition is 130 or more. 
     
     
         9 . The lubricating oil composition according to  claim 1 , wherein an HTHS viscosity of the lubricating oil composition at 150° C. is 2.5 mPa·s or more. 
     
     
         10 . The lubricating oil composition according to  claim 1 , wherein a viscosity grade of the lubricating oil composition is 0 W-20 to 0 W-30, as classified according to SAE J300:2015. 
     
     
         11 . The lubricating oil composition according to  claim 1 , which is suitable for a diesel engine. 
     
     
         12 . An internal combustion engine, comprising the lubricating oil composition according to  claim 1 , which fills the internal combustion engine. 
     
     
         13 . The internal combustion engine according to  claim 12 , wherein the internal combustion engine is a diesel engine. 
     
     
         14 . A method for lubricating an internal combustion engine, comprising applying the lubricating oil composition according to  claim 1  to the lubrication of an internal combustion engine. 
     
     
         15 . The method for lubricating an internal combustion engine according to  claim 14 , wherein the internal combustion engine is a diesel engine.