Lubricant composition

Abstract

A lubricating oil composition, including: a base oil including an ester base oil and a hindered amine compound, where a content of the hindered amine compound is from 0.60 mass % to 10.0 mass % based on a total amount of the lubricating oil composition. An internal combustion engine installed in a hybrid system, the internal combustion engine filled with the lubricating oil composition. A method of lubricating an internal combustion engine installed a hybrid system, including: applying the lubricating oil composition to the internal combustion engine.

1 . A lubricating oil composition, comprising:
 a base oil comprising an ester base oil; and   a hindered amine compound,   wherein a content of the hindered amine compound is from 0.60 mass % to 10.0 mass % based on a total amount of the lubricating oil composition.   
     
     
         2 . The lubricating oil composition according to  claim 1 , wherein a content ratio of the ester base oil is 10 mass % to 100 mass % based on a total amount of the base oil. 
     
     
         3 . The lubricating oil composition according to  claim 1 , wherein the ester base oil comprises one or more of a polyol ester and a diester. 
     
     
         4 . The lubricating oil composition according to  claim 1 , wherein the base oil comprises the ester base oil and optionally a mineral oil,
 wherein a content ratio of the mineral oil is 90 mass % or less based on a total amount of the base oil.   
     
     
         5 . The lubricating oil composition according to  claim 1 , wherein the base oil comprises the ester base oil and optionally a mineral oil,
 wherein a content ratio of the mineral oil is 40 mass % or less based on a total amount of the base oil.   
     
     
         6 . The lubricating oil composition according to  claim 4 , wherein the base oil comprises the ester base oil and a mineral oil. 
     
     
         7 . The lubricating oil composition according to  claim 1 , wherein a content of the hindered amine compound based on a total 100 parts by mass of the base oil is 2.5 parts by mass or more and 50.0 parts by mass or less. 
     
     
         8 . The lubricating oil composition according to  claim 1 , wherein a content of the hindered amine compound is from 2.50 mass % to 10.0 mass % based on the total amount of the lubricating oil composition. 
     
     
         9 . The lubricating oil composition according to  claim 1 , further comprising an antioxidant that does not correspond to the hindered amine compound. 
     
     
         10 . The lubricating oil composition according to  claim 9 , wherein the antioxidant comprises one or more of an amine antioxidant other than a hindered amine compound and a phenolic antioxidant. 
     
     
         11 . The lubricating oil composition according to  claim 9 , wherein a content of the antioxidant based on a total 100 parts by mass of the hindered amine compound is 1.0 part by mass or more and 100 parts by mass or less. 
     
     
         12 . The lubricating oil composition according to  claim 1 , wherein a content of a metal-based detergent in terms of metal atoms is less than 50 ppm by mass based on the total amount of the lubricating oil composition. 
     
     
         13 . The lubricating oil composition according to  claim 1 , being used wherein the lubricating oil composition is suitable for lubrication of an internal combustion engine of a hybrid system. 
     
     
         14 . An internal combustion engine installed in a hybrid system, is wherein the internal combustion engine is filled with the lubricating oil composition according to  claim 1 . 
     
     
         15 . A method of lubricating an internal combustion engine, comprising:
 applying the lubricating oil composition according to  claim 1  to the internal combustion engine installed in a hybrid system.   
     
     
         16 . The lubricating oil composition according to  claim 2 , wherein the ester base oil comprises one or more of a polyol ester and a diester. 
     
     
         17 . The lubricating oil composition according to  claim 2 , wherein the base oil comprises the ester base oil and optionally a mineral oil,
 wherein a content ratio of the mineral oil is 90 mass % or less based on a total amount of the base oil.   
     
     
         18 . The lubricating oil composition according to  claim 3 , wherein the base oil comprises the ester base oil and optionally a mineral oil,
 wherein a content ratio of the mineral oil is 90 mass % or less based on a total amount of the base oil.   
     
     
         19 . The lubricating oil composition according to  claim 2 , wherein a content of the hindered amine compound based on a total 100 parts by mass of the base oil is 2.5 parts by mass or more and 50.0 parts by mass or less. 
     
     
         20 . The lubricating oil composition according to  claim 3 , wherein a content of the hindered amine compound based on a total 100 parts by mass of the base oil is 2.5 parts by mass or more and 50.0 parts by mass or less.