Method of Friction Control

Abstract

This invention relates to a method of lubricating an internal combustion engine comprising at least one of a crankcase, a gear and a wet-clutch, said method comprising supplying to said crankcase, gear, and wet-clutch a lubricating composition containing: (a) an oil of lubricating viscosity; (b) a boron containing compound; and (c) a friction modifier.

1 . A method of lubricating an internal combustion engine comprising a crankcase and at least one of a gear and a wet-clutch, said method comprising supplying to said crankcase and at least one of the gear and wet-clutch a lubricating composition comprising:
 (a) an oil of lubricating viscosity;   (b) 1 wt % to 8 wt % of a boron containing compound; and   (c) 0.05 wt % to 3 wt % of a friction modifier, wherein the friction modifier is selected from the group consisting of a molybdenum dithiocarbamate, a molybdenum thiophosphate, a long chain fatty acid ester and mixtures thereof and   
     wherein the internal combustion engine is a 4-stroke motorcycle engine. 
   
   
       2 . The method of  claim 1 , wherein the lubricating composition is supplied to the crankcase and to the gear (or multiplicity of gears). 
   
   
       3 . The method of  claim 1 , wherein the lubricating composition is supplied to the crankcase and the wet clutch. 
   
   
       4 . The method of  claim 1 , wherein the lubricating composition is supplied to the crankcase and both the gear (or gears) and the wet clutch. 
   
   
       5 . The method of  claim 1 , wherein the boron containing compound comprises a borate ester, a borate alcohol, a borated dispersant or mixtures thereof 
   
   
       6 . The method of  claim 1 , wherein the boron containing compound is a borated dispersant. 
   
   
       7 . The method of  claim 1 , wherein the boron containing compound is an N-substituted long chain alkenyl succinimide. 
   
   
       8 . The method of  claim 7 , wherein the N-substituted long chain alkenyl succinimide comprises a polyisobutyl group with a number average molecular weight of 350 to 5000. 
   
   
       9 . (canceled) 
   
   
       10 . (canceled) 
   
   
       11 . The method of  claim 1 , wherein the long chain fatty acid ester is a mono-ester or a (tri)glyceride. 
   
   
       12 . (canceled) 
   
   
       13 . The method of  claim 1 , wherein the lubricating composition has a SAE viscosity grade from XW-Y, wherein X is an integer from 0 to 20 and Y is an integer from 20 to 50. 
   
   
       14 . (canceled) 
   
   
       15 . (canceled) 
   
   
       16 . The method of  claim 7 , wherein the N-substituted long chain alkenyl succinimide comprises a polyisobutyl group with a number average molecular weight of 550 to 1500.