Lubricants for use in boosted engines

Abstract

A lubricating oil composition including greater than 50 wt. % of a base oil, from 100 ppm to less than 1800 ppm by weight of total metal from metal-containing detergent(s) including an overbased calcium detergent and a magnesium containing detergent. The composition has a total nitrogen of 900 ppm to less than 1600 ppm by weight, and a ratio of total metal from the detergent(s) in ppm to the total nitrogen in ppm of less than 1.9. The composition also includes a borated compound to provide greater than 50 ppm by weight to 1000 ppm by weight of boron, and a ppm ratio of metal from the detergent(s) in ppm to the total boron is less than 7.5 and a molybdenum compound to provide greater than 80 ppm to 1200 ppm by weight molybdenum and a ppm ratio of total metal from the detergent(s) to the molybdenum is less than 23.8.

1 . A lubricating oil composition comprising:
 greater than 50 wt. % of a base oil of lubricating viscosity and one or more metal-containing detergent(s) including at least one overbased calcium detergent and at least one magnesium containing detergent, each said overbased metal-containing detergent has a total base number greater than 225 mg KOH/g, measured by the method of ASTM D-2896, wherein said lubricating oil composition has from 100 ppm by weight to less than 1800 ppm by weight of total metal from the one or more metal-containing detergent(s);   wherein the lubricating oil composition has a total nitrogen amount of 900 ppm by weight to less than 1600 ppm by weight, and a ratio of total metal from the one or more metal-containing detergent(s) in ppm in the lubricating oil composition to the total nitrogen in ppm in the lubricating oil composition is less than 1.9;   a borated compound in an amount sufficient to provide greater than 50 ppm by weight to 1000 ppm by weight of boron to the lubricating oil composition, and a ratio of total metal from the one or more metal-containing detergent(s) in ppm in the lubricating oil composition to the total boron in ppm in the lubricating oil composition is less than 7.5; and   an oil soluble molybdenum compound in an amount sufficient to provide greater than 80 ppm by weight to 1200 ppm by weight molybdenum to the lubricating oil composition, and a ratio of total metal from the one or more metal-containing detergent(s) in ppm in the lubricating oil composition to the total molybdenum in ppm in the lubricating oil composition is less than 23.8;   the lubricating oil composition has a NOACK volatility as measured by the method of ASTM D-5800 at 250° C. of less than 11.0 wt. %, and the lubricating oil composition is effective to ensure a TCO Temperature Increase of less than 9.0% as measured using the 2015 version of the General Motors Dexos1® Turbocharger Coking Test.   
     
     
         2 . The lubricating oil composition according to  claim 1 , wherein the ratio of total metal from the one or more metal-containing detergent(s) in ppm in the lubricating oil composition to the total nitrogen in ppm in the lubricating oil composition is less than 1.8. 
     
     
         3 . The lubricating oil composition according to  claim 1 , wherein the ratio of total metal from the one or more metal-containing detergent(s) in ppm in the lubricating oil composition to the total boron in ppm in the lubricating oil composition is less than 7.3. 
     
     
         4 . The lubricating oil composition according to  claim 1 , wherein the ratio of total metal from the one or more metal-containing detergent(s) in ppm in the lubricating oil composition to the total molybdenum in ppm in the lubricating oil composition is less than 20.0. 
     
     
         5 . The lubricating oil composition according to  claim 1 , wherein the lubricating oil composition has a NOACK volatility as measured by the method of ASTM D-5800 at 250° C. of 2.0 wt. % to less than 11.0 wt. %. 
     
     
         6 . The lubricating oil composition according to  claim 1 , wherein the lubricating oil composition is effective to ensure a TCO Temperature Increase of less than 8.0% as measured using the 2015 version of the General Motors Dexos1® Turbocharger Coking Test. 
     
     
         7 . The lubricating oil composition according to  claim 1 , wherein the lubricating oil composition has an 0 W-20 rating. 
     
     
         8 . The lubricating oil composition according to  claim 1 , wherein the ratio of total metal from the one or more metal-containing detergent(s) in ppm in the lubricating oil composition to the total nitrogen in ppm in the lubricating oil composition is from 0.1 to 1.7. 
     
     
         9 . The lubricating oil composition according to  claim 1 , wherein the ratio of total metal from the one or more metal-containing detergent(s) in ppm in the lubricating oil composition to the total boron in ppm in the lubricating oil composition is from 0.1 to 7.0. 
     
     
         10 . The lubricating oil composition according to  claim 1 , wherein the ratio of total metal from the one or more metal-containing detergent(s) in ppm in the lubricating oil composition to the total molybdenum in ppm in the lubricating oil composition is from 1.0 to 13.0. 
     
     
         11 . The lubricating oil composition according to  claim 1 , wherein the lubricating oil composition is effective to ensure a TCO Temperature Increase of from 1.0% to less than 6.0% as measured using the 2015 version of the General Motors Dexos1® Turbocharger Coking Test. 
     
     
         12 . The lubricating oil composition according to  claim 1 , wherein the lubricating oil composition has a NOACK volatility as measured by the method of ASTM D-5800 at 250° C. of 5.0 wt. % to less than 10.9 wt. %. 
     
     
         13 . A method for reducing or preventing formation of deposits in a boosted internal combustion engine comprising steps of:
 lubricating a boosted internal combustion engine with the lubricating oil composition of  claim 1 , and   operating the engine lubricated with the lubricating oil composition.   
     
     
         14 . The method of  claim 12 , wherein the lubricating oil composition is effective to ensure a TCO Temperature Increase of less than 8.0% as measured using the 2015 version of the General Motors Dexos1® Turbocharger Coking Test. 
     
     
         15 . The method of  claim 12 , wherein the ratio of total metal from the one or more metal-containing detergent(s) in ppm in the lubricating oil composition to the total nitrogen in ppm in the lubricating oil composition is from 0.1 to 1.7. 
     
     
         16 . The method of  claim 12 , wherein the ratio of total metal from the one or more metal-containing detergent(s) in ppm in the lubricating oil composition to the total boron in ppm in the lubricating oil composition is from 0.1 to 7.0. 
     
     
         17 . The method of  claim 12 , wherein the ratio of total metal from the one or more metal-containing detergent(s) in ppm in the lubricating oil composition to the total molybdenum in ppm in the lubricating oil composition is from 1.0 to 13.0. 
     
     
         18 . The method of  claim 12 , wherein the lubricating oil composition is effective to ensure a TCO Temperature Increase of from 1.0% to less than 6.0% as measured using the 2015 version of the General Motors Dexos1® Turbocharger Coking Test. 
     
     
         19 . The method of  claim 12 , wherein the lubricating oil composition has a NOACK volatility as measured by the method of ASTM D-5800 at 250° C. of 5.0 wt. % to less than 10.9 wt. %.