Lubricating oil composition and method for producing lubricating oil composition

Abstract

Provided is a lubricating oil composition containing a base oil (A); a molybdenum dithiophosphate (B1) in an amount of 400 ppm by mass or more as expressed in terms of a molybdenum atom; an organic metal-based detergent (C1) containing a metal atom selected from an alkali metal atom and an alkaline earth metal atom in an amount of 1,400 ppm by mass or less as expressed in terms of the metal atom; and a hindered amine-based antioxidant (D1) in an amount of 900 ppm by mass or more as expressed in terms of a nitrogen atom, with a sulfated ash content being 0.70% by mass or less. The lubricating oil composition may be one in which the detergency, the wear resistance, and the friction-reducing effect are improved with a well balance while reducing the ash content.

1 . A lubricating oil composition, comprising:
 (A) a base oil (A);   (B1) a molybdenum dithiophosphate (B1) in an amount of 400 ppm by mass or more as expressed in terms of a molybdenum atom;   (C1) an organic metal-based detergent (C1) comprising a metal atom selected from the group consisting of an alkali metal atom and an alkaline earth metal atom in an amount of 1,400 ppm by mass or less as expressed in terms of the metal atom; and   (D1) a hindered amine-based antioxidant (D1) in an amount of 900 ppm by mass or more as expressed in terms of a nitrogen atom,   wherein a sulfated ash content of the lubricating oil composition is 0.70% by mass or less.   
     
     
         2 . The lubricating oil composition according to  claim 1 ,
 wherein a content of a molybdenum dithiocarbamate (B2), as expressed in terms of a molybdenum atom, is 600 ppm by mass or less on the basis of the whole amount of the lubricating oil composition.   
     
     
         3 . The lubricating oil composition according to  claim 1 , further comprising:
 (E1) a zinc dithiophosphate (E1).   
     
     
         4 . The lubricating oil composition according to  claim 3 , wherein a content of the component (E1) as expressed in terms of a zinc atom is from 100 to 700 ppm by mass on the basis of the whole amount of the lubricating oil composition. 
     
     
         5 . The lubricating oil composition according to  claim 1 , further comprising:
 (C2) an alkali metal borate (C2).   
     
     
         6 . The lubricating oil composition according to  claim 1 , wherein the content of a phosphorus atom is from 200 to 1,100 ppm by mass on the basis of the whole amount of the lubricating oil composition. 
     
     
         7 . The lubricating oil composition according to  claim 1 , wherein the content of the component (B1) as expressed in terms of a molybdenum atom is from 400 to 2,000 ppm by mass on the basis of the whole amount of the lubricating oil composition. 
     
     
         8 . The lubricating oil composition according to  claim 1 , wherein the component (C1) comprises a calcium-based detergent. 
     
     
         9 . The lubricating oil composition according to  claim 1 , wherein the content of the component (C1) as expressed in terms of a metal atom is from 100 to 1,100 ppm by mass on the basis of the whole amount of the lubricating oil composition. 
     
     
         10 . The lubricating oil composition according to  claim 1 , wherein the content of the component (D1) as expressed in terms of a nitrogen atom is from 900 to 2,000 ppm by mass on the basis of the whole amount of the lubricating oil composition. 
     
     
         11 . The lubricating oil composition according to  claim 1 , wherein a sulfated ash content is from 0.06 to 0.50% by mass on the basis of the whole amount of the lubricating oil composition. 
     
     
         12 . The lubricating oil composition according to  claim 1 , wherein a content of the component (A) is 60% by mass or more on the basis of the whole amount of the lubricating oil composition. 
     
     
         13 . The lubricating oil composition according to  claim 1 , wherein a total blending amount of the component (A), the component (B1), the component (C1), and the component (D1) is 70% by mass or more on the basis of the whole amount of the lubricating oil composition. 
     
     
         14 . A method, comprising lubricating an internal combustion engine provided with an exhaust gas postprocessing device with the lubricating oil composition of  claim 1 . 
     
     
         15 . A method for producing a lubricating oil composition, the method comprising blending:
 (A) a base oil (A);   (B1) a molybdenum dithiophosphate (B1) in an amount of 400 ppm by mass or more as expressed in terms of a molybdenum atom;   (C1) an organic metal-based detergent (C1) comprising a metal atom selected from the group consisting of an alkali metal atom and an alkaline earth metal atom in an amount of 1,400 ppm by mass or less as expressed in terms of the metal atom; and   (D1) a hindered amine-based antioxidant (D1) in an amount of 900 ppm by mass or more as expressed in terms of a nitrogen atom,   to obtain a lubricating oil composition having a sulfated ash content of 0.70% by mass or less.