Lubricant composition

Abstract

A lubricating oil composition used in an internal combustion engine is provided. The internal combusting engine uses a fuel that contains at least one fat and oil selected from a group consisting of natural fat and oil, hydrotreated natural fat and oil, transesterified natural fat, and oil and hydrotreated transesterified natural fat and oil. The lubricating oil composition includes: base oil of lubricating oil; a component (A) containing a boron derivative of an alkyl or alkenyl-substituted succinimide compound having a number average molecular weight of 200 to 5000; and a component (B) containing an alkaline earth metal-based detergent. The component (A) is contained by 0.01 to 0.2 mass % in terms of boron of a total amount of the composition while the component (B) is contained by 0.35 mass % or less in terms of the alkaline earth metal of the total amount of the composition.

1 . A lubricating oil composition for an internal combustion engine, the internal combustion engine using a fuel that comprises at least one fat and oil selected from a group consisting of natural fat and oil, hydrotreated natural fat and oil, transesterified natural fat and oil and hydrotreated transesterified natural fat and oil, wherein the lubricating oil composition comprises:
 a base oil of lubricating oil;   a component (A) comprising a boron derivative of a succinimide compound substituted by an alkyl or alkenyl group having a number average molecular weight of 200 to 5000; and   a component (B) comprising an alkaline earth metal-based detergent, and wherein the lubricating oil composition comprises the component (A) of 0.01 to 0.2 mass % in terms of boron of a total amount of the composition and the component (B) of 0.35 mass % or less in terms of the alkaline earth metal of the total amount of the composition.   
     
     
         2 . The lubricant oil composition according to  claim 1 , wherein a mass ratio (B/N) of boron (B) and nitrogen (N) in the component (A) is 0.5 or more. 
     
     
         3 . The lubricant oil composition according to  claim 1 , wherein the lubricating oil composition comprises at least one of a phenol-based antioxidant and an amine-based antioxidant in an amount of 0.3 mass % or more of the total amount of the composition. 
     
     
         4 . The lubricant oil composition according to  claim 1 , wherein a sulfur content is 0.5 mass % or less of the total amount of the composition. 
     
     
         5 . The lubricant oil composition according to  claim 1 , wherein a phosphorus content is 0.12 mass % or less of the total amount of the composition. 
     
     
         6 . The lubricant oil composition according to  claim 1 , wherein a sulfated ash content is 1.1 mass % or less. 
     
     
         7 . The lubricant oil composition according to  claim 3 , wherein a sulfur content is 0.5 mass % or less of the total amount of the composition. 
     
     
         8 . The lubricant oil composition according to  claim 3 , wherein a phosphorus content is 0.12 mass % or less of the total amount of the composition. 
     
     
         9 . The lubricant oil composition according to  claim 4 , wherein a phosphorus content is 0.12 mass % or less of the total amount of the composition. 
     
     
         10 . The lubricant oil composition according to  claim 7 , wherein a phosphorus content is 0.12 mass % or less of the total amount of the composition. 
     
     
         11 . The lubricant oil composition according to  claim 3 , wherein a sulfated ash content is 1.1 mass % or less. 
     
     
         12 . The lubricant oil composition according to  claim 4 , wherein a sulfated ash content is 1.1 mass % or less. 
     
     
         13 . The lubricant oil composition according to  claim 5 , wherein a sulfated ash content is 1.1 mass % or less. 
     
     
         14 . The lubricant oil composition according to  claim 7 , wherein a sulfated ash content is 1.1 mass % or less. 
     
     
         15 . The lubricant oil composition according to  claim 8 , wherein a sulfated ash content is 1.1 mass % or less. 
     
     
         16 . The lubricant oil composition according to  claim 9 , wherein a sulfated ash content is 1.1 mass % or less. 
     
     
         17 . The lubricant oil composition according to  claim 10 , wherein a sulfated ash content is 1.1 mass % or less.