Lubricating composition

Abstract

The present invention provides a lubricating composition comprising: (i) a base oil; (ii) a non-silicone anti-foam agent; and (iii) one or more performance additives; wherein the composition has a kinematic viscosity at 100° C. (according to ASTM D445) of 16.3 mm 2 /s or less, a low temperature cranking viscosity of at most 6600 cP at −30° C. (ASTM D5293) and a NOACK volatility of at most 11% according to CEC-L-40-93.

1 . A lubricating composition comprising:
 (i) a base oil;   (ii) a non-silicone anti-foam agent; and   (iii) one or more performance additives;   wherein the composition has a kinematic viscosity at 100° C. (according to ASTM D445) of 16.3 mm 2 /s or less, a low temperature cranking viscosity of at most 6600 cP at −30° C. (ASTM D5293) and a NOACK volatility of at most 11% according to CEC-L-40-93.   
     
     
         2 . Lubricating composition according to  claim 1 , wherein the composition has a NOACK volatility of at most 10.5% according to CEC-L-40-93. 
     
     
         3 . Lubricating composition according to  claim 1 , wherein the non-silicone anti-foam agent is selected from acrylate, polyacrylate, and polymethacrylate (PMA) polymers. 
     
     
         4 . Lubricating composition according to  claim 1 , wherein the non-silicone anti-foam agent is present at a level of from 10 ppm to 500 pm, by weight of the composition. 
     
     
         5 . Lubricating composition according to  claim 1 , wherein the base oil comprises one or more Fischer-Tropsch derived base oils. 
     
     
         6 . Lubricating composition according to  claim 5 , wherein the base oil comprises 80% or greater of one or more Fischer-Tropsch derived base oils, by weight of the base oil. 
     
     
         7 . Lubricating composition according to  claim 1 , wherein the composition is essentially free of polyalphaolefin base oil. 
     
     
         8 . Lubricating composition according to  claim 1 , wherein the one or more performance additives comprises a silicone-based anti-foam agent. 
     
     
         9 . (canceled) 
     
     
         10 . (canceled) 
     
     
         11 . A method of lubrication comprising applying a lubricating composition to a crankcase of an engine, wherein the lubricating composition comprises:
 (i) a base oil;   (ii) a non-silicone anti-foam agent; and   (iii) one or more performance additives;   wherein the composition has a kinematic viscosity at 100° C. (according to ASTM D445) of 16.3 mm 2 /s or less, a low temperature cranking viscosity of at most 6600 cP at −30° C. (ASTM D5293) and a NOACK volatility of at most 11% according to CEC-L-40-93.   
     
     
         12 . The method according to  claim 11 , wherein the non-silicone anti-foam agent is an alkyl polyacrylate anti-foam agent. 
     
     
         13 . The method according to  claim 11 , wherein the composition has a NOACK volatility of at most 10.5% according to CEC-L-40-93. 
     
     
         14 . The method according to  claim 11 , wherein the non-silicone anti-foam agent is selected from acrylate, polyacrylate, and polymethacrylate (PMA) polymers. 
     
     
         15 . The method according to  claim 11 , wherein the non-silicone anti-foam agent is present at a level of from 10 ppm to 500 pm, by weight of the composition. 
     
     
         16 . The method according to  claim 11 , wherein the base oil comprises one or more Fischer-Tropsch derived base oils. 
     
     
         17 . The method according to  claim 11 , wherein the base oil comprises 80% or greater of one or more Fischer-Tropsch derived base oils, by weight of the base oil. 
     
     
         18 . The method according to  claim 11 , wherein the composition is essentially free of polyalphaolefin base oil. 
     
     
         19 . The method according to  claim 11 , wherein the one or more performance additives comprises a silicone-based anti-foam agent.