Lubricant composition

Abstract

A lubricating oil composition is used in an internal combustion engine that uses a fuel containing at least one fat and oil of natural fat and oil, hydrotreated natural fat and oil, transesterified natural fat and oil and hydrotreated transesterified natural fat and oil. A sulfur compound containing at least one —C—S—C-bond is added to base oil. A content of sulfur contained in the —C—S—C-bond is 0.3 mass % or less based on a total amount of the compound.

1 . A lubricating oil composition comprising:
 at least one fat and oil selected from the group consisting of natural fat and oil, hydrotreated natural fat and oil, transesterified natural fat and oil and hydrotreated transesterified natural fat and oil; and   a sulfur compound comprising at least one —C—S—C-bond, wherein   a content of sulfur in the sulfur compound with the at least one —C—S—C-bond is 0.3 mass % or less based on a total amount of the composition.   
     
     
         2 . The lubricating oil composition according to  claim 1 , wherein the sulfur compound does not comprise a —C—S x —C-bond, wherein x is an integer of 2 or more. 
     
     
         3 . The lubricating oil composition according to  claim 1 , further comprising an alkaline earth metal-based detergent in an amount of 0.35 mass % or less. 
     
     
         4 . The lubricating oil composition according to  claim 1 , further comprising phosphorus in an amount of 0.12 mass % or less based on a total amount of the composition. 
     
     
         5 . The lubricating oil composition according to  claim 1 , further comprising a sulfate ash in an amount of 1.1 mass % or less. 
     
     
         6 . The lubricating oil composition according to  claim 1 , further comprising at least one selected from the group consisting of a phenol-based antioxidant and an amine-based antioxidant in an amount of 0.3 mass % or more based on a total amount of the composition. 
     
     
         7 . The lubricant oil composition according to  claim 1 , further comprising sulfur in an amount of 0.5 mass % or less based on a total amount of the composition. 
     
     
         8 . The lubricating oil composition according to  claim 2 , further comprising an alkaline earth metal-based detergent in an amount of 0.35 mass % or less. 
     
     
         9 . The lubricating oil composition according to  claim 2 , further comprising phosphorous in an amount of 0.12 mass % or less based on a total amount of the composition. 
     
     
         10 . The lubricating oil composition according to  claim 3 , further comprising phosphorous in an amount of 0.12 mass % or less based on a total amount of the composition. 
     
     
         11 . The lubricating oil composition according to  claim 8 , further comprising phosphorous in an amount of 0.12 mass % or less based on a total amount of the composition. 
     
     
         12 . The lubricating oil composition according to  claim 2 , further comprising a sulfate ash in an amount of 1.1 mass % or less. 
     
     
         13 . The lubricating oil composition according to  claim 3 , further comprising a sulfate ash in an amount of 1.1 mass % or less. 
     
     
         14 . The lubricating oil composition according to  claim 8 , further comprising a sulfate ash in an amount of 1.1 mass % or less. 
     
     
         15 . The lubricating oil composition according to  claim 4 , further comprising a sulfate ash in an amount of 1.1 mass % or less. 
     
     
         16 . The lubricating oil composition according to  claim 9 , further comprising a sulfate ash in an amount of 1.1 mass % or less. 
     
     
         17 . The lubricating oil composition according to  claim 10 , further comprising a sulfate ash in an amount of 1.1 mass % or less. 
     
     
         18 . The lubricating oil composition according to  claim 11 , further comprising a sulfate ash in an amount of 1.1 mass % or less.