Lubricating Oil Compositions

Abstract

A crankcase lubricating oil composition for the crankcase of a spark-ignited or compression-ignited internal combustion engine, comprising a magnesium-containing detergent, in an amount sufficient to provide from 200-4000 ppm magnesium to the lubricating oil composition, in combination with an oil-soluble or oil-dispersible molybdenum compound in an amount sufficient to provide from 600-1500 ppm molybdenum atoms to the lubricating oil composition, and with an oil-soluble or oil-dispersible boron-containing compound in an amount sufficient to provide from 200-600 ppm boron atoms to the lubricating oil composition to improve the friction and fuel economy performance.

1 . A crankcase lubricating oil composition comprising or made by admixing:
 (A) an oil of lubricating viscosity, in a major amount;   (B) an oil-soluble or oil-dispersible molybdenum-containing additive, providing from 600-1500 ppm of molybdenum atoms to the lubricating oil composition;   (C) a detergent composition comprising one or more magnesium sulfonate detergents in an amount providing from 200 to 4000 ppm magnesium atoms to the lubricating oil composition, measured according to ASTM D5185; and   (D) an oil-soluble or oil-dispersible boron-containing compound present in the lubricating oil composition in an amount sufficient to provide from 200-600 ppm boron atoms to the lubricating oil composition, measured according to ASTM D5185.   
     
     
         2 . A lubricating oil composition according to  claim 1 , wherein the detergent composition comprises one or more additional detergent additive selected from magnesium salicylate, calcium salicylate, calcium sulfonate, magnesium phenate, calcium phenate, and hybrid detergents comprising two or more of these additional detergent additives selected from magnesium salicylate, calcium salicylate, calcium sulfonate, magnesium phenate, and calcium phenate. 
     
     
         3 . A lubricating oil composition according to  claim 2 , wherein the detergent composition further comprises a calcium salicylate detergent, a calcium sulfonate detergent, or a calcium salicylate detergent and a calcium sulfonate detergent. 
     
     
         4 . A lubricating oil composition according to  claim 3 , wherein the detergent composition consists of one or more magnesium sulfonate detergents and one or more calcium salicylate detergents. 
     
     
         5 . A lubricating oil composition according to  claim 3 , wherein the calcium-containing detergent is present in an amount sufficient to provide from 500-4000 ppm atomic calcium to the lubricating oil composition, measured according to ASTM D5185. 
     
     
         6 . A lubricating oil composition according to  claim 5 , wherein the calcium-containing detergent is present in an amount sufficient to provide from 750-3000 ppm atomic calcium to the lubricating oil composition, measured according to ASTM D5185. 
     
     
         7 . A lubricating oil composition according to  claim 6 , wherein the calcium-containing detergent is present in an amount sufficient to provide from 900-2000 ppm atomic calcium to the lubricating oil composition, measured according to ASTM D5185. 
     
     
         8 . A lubricating oil composition according to  claim 4 , wherein the calcium-containing detergent is present in an amount sufficient to provide from 500-4000 ppm atomic calcium to the lubricating oil composition, measured according to ASTM D5185. 
     
     
         9 . A lubricating oil composition according to  claim 8 , wherein the calcium-containing detergent is present in an amount sufficient to provide from 750-3000 ppm atomic calcium to the lubricating oil composition, measured according to ASTM D5185. 
     
     
         10 . A lubricating oil composition according to  claim 9 , wherein the calcium-containing detergent is present in an amount sufficient to provide from 900-2000 ppm atomic calcium to the lubricating oil composition, measured according to ASTM D5185. 
     
     
         11 . A method of lubricating a spark-ignited or compression-ignited internal combustion engine comprising lubricating the engine with a lubricating oil composition as defined in accordance with  claim 1 . 
     
     
         12 . A lubricating oil composition according to  claim 1 , wherein the molybdenum-containing additive, provides from 700-1000 ppm of molybdenum atoms to the lubricating oil composition. 
     
     
         13 . A lubricating oil composition according to  claim 1 , wherein the detergent composition comprises one or more overbased magnesium sulfonate detergents having a total base number of 150 to 500 mgKOH/g. 
     
     
         14 . A lubricating oil composition according to  claim 1 , wherein the detergent composition comprises one or more overbased magnesium sulfonate detergents and is present in an amount providing from 450 to 1200 ppm magnesium atoms to the lubricating oil composition, measured according to ASTM D5185. 
     
     
         15 . A lubricating oil composition according to  claim 1 , wherein the boron-containing compound is present in the lubricating oil composition in an amount sufficient to provide from 200-400 ppm boron atoms to the lubricating oil composition, measured according to ASTM D5185. 
     
     
         16 . A lubricating oil composition according to  claim 9 , wherein the:
 (B) molybdenum-containing additive provides from 700-1000 ppm of molybdenum atoms to the lubricating oil composition;   (C) detergent composition comprises one or more overbased magnesium sulfonate detergents having a total base number of 150 mgKOH/g or more and is present in an amount providing from 450 to 1200 ppm magnesium atoms to the lubricating oil composition, measured according to ASTM D5185; and   (D) boron-containing compound is present in the lubricating oil composition in an amount sufficient to provide from 200-400 ppm boron atoms to the lubricating oil composition, measured according to ASTM D5185.   
     
     
         17 . A lubricating oil composition according to  claim 16 , wherein the detergent composition comprises one or more overbased magnesium sulfonate detergents having a total base number of 150 to 500 mgKOH/g. 
     
     
         18 . A method of lubricating a spark-ignited or compression-ignited internal combustion engine comprising lubricating the engine with a lubricating oil composition as defined in accordance with  claim 4 . 
     
     
         19 . A method of lubricating a spark-ignited or compression-ignited internal combustion engine comprising lubricating the engine with a lubricating oil composition as defined in accordance with  claim 10 . 
     
     
         20 . A method of lubricating a spark-ignited or compression-ignited internal combustion engine comprising lubricating the engine with a lubricating oil composition as defined in accordance with  claim 16 . 
     
     
         21 . A method of lubricating a spark-ignited or compression-ignited internal combustion engine comprising lubricating the engine with a lubricating oil composition as defined in accordance with  claim 17 .