Method of Lubricating a Manual Transmission

Abstract

The present invention relates to a method of lubricating a driveline device comprising supplying to the driveline device a lubricating composition comprising an oil of lubricating viscosity and an aromatic hydroxy-substituted compound. The invention further provides for the use of the lubricating composition comprising the aromatic hydroxy-substituted compound as at least one of a filterability aid, and a wax crystal growth modifier/gelation inhibitor in the driveline device.

1 .- 7 . (canceled) 
     
     
         8 . A method of lubricating a manual transmission, comprising supplying to the manual transmission a lubricating composition comprising an oil of lubricating viscosity and a compound represented by formula (1): 
       
         
           
           
               
               
           
         
       
       wherein
 each R 1  is independently hydrogen or a linear hydrocarbyl group containing at least 1 carbon atom; 
 each R 2  is independently a linear hydrocarbyl group containing at least 10 carbon atoms; 
 each R 3  and R 4  are independently hydrogen or a linear hydrocarbyl group containing 1 to 5 carbon atoms; 
 each R 5  is independently hydrogen or a linear hydrocarbyl group containing 1 to 10 carbon atoms; and 
 n is 1 to 20, 
 
     
     
         9 . The method of  claim 8 , wherein n is 6 to 8. 
     
     
         10 . The method of  claim 8 , wherein R 3  and R 4  are both hydrogen. 
     
     
         11 . The method of  claim 8 , wherein R 5  is hydrogen. 
     
     
         12 . The method of  claim 8 , wherein R 3 , R 4  and R 5  are hydrogen. 
     
     
         13 . The method of  claim 8 , wherein each R 1  is independently a linear hydrocarbyl group containing at least 6 carbon atoms; and each R 2  is independently a linear hydrocarbyl group containing 10 to 60 carbon atoms; R 3  and R 4  are hydrogen; R 5  is hydrogen; and n is 6 to 8. 
     
     
         14 . The method of  claim 13 , wherein R 2  contains 18 to 24 carbon atoms. 
     
     
         15 . The method of  claim 8 , wherein each R 1  is hydrogen; each R 2  is a linear hydrocarbyl group containing 16 to 40 carbon atoms; R 3  and R 4  are hydrogen; R 5  is hydrogen; and n is 6 to 8. 
     
     
         16 . The method of  claim 8 , wherein the oil of lubricating viscosity comprises bright stock present from 10 wt % to 97 wt % of the lubricating composition. 
     
     
         17 . The method of  claim 8 , wherein the oil of lubricating viscosity comprises bright stock present from 20 wt % to 95 wt % of the lubricating composition 
     
     
         18 . The method of  claim 8 , wherein the oil of lubricating viscosity comprises bright stock present from 80 wt % to 95 wt % of the lubricating composition. 
     
     
         19 . The method of  claim 8 , wherein the lubricating composition has a SAE viscosity grade of XW—Y, wherein X is 70, 75, 80 or 85 and Y is 80, 85, 90, or 140.