Lubricant formulations and methods

Abstract

The embodiments described herein relate to particular formulations and methods that provide reduced exhaust catalyst deactivation and/or reduced oil consumption.

1 . A lubricant composition comprising:
 (a) a base oil having a NOACK volatility of from about 5 to about 15; and   (b) a zinc dialkyl dithio phosphate having a primary alkoxy moiety,   wherein the lubricant composition is essentially free of zinc dialkyl dithio phosphate having all-secondary alkoxy moieties.   
     
     
         2 . The lubricant composition of  claim 1 , wherein the lubricant composition is an engine oil. 
     
     
         3 . The lubricant composition of  claim 1 , wherein the lubricant composition is a heavy duty engine oil. 
     
     
         4 . The lubricant composition of  claim 1 , wherein the base oil has a NOACK volatility of from about 10 to about 15. 
     
     
         5 . The lubricant composition of  claim 4 , wherein the base oil has a NOACK volatility of from about 9 to about 13. 
     
     
         6 . The lubricant composition of  claim 1 , wherein the base oil comprises a mineral oil, a synthetic oil, or a mixture thereof. 
     
     
         7 . The lubricant composition of  claim 1 , wherein the base oil comprises on or more of a member selected from the group consisting of: a group I base oil, a group II base oil, a group III base oil, a group IV base oil, and a group V base oil. 
     
     
         8 . The lubricant composition of  claim 1 , wherein the total amount of phosphorus in the lubricant composition comprises less than about 20% phosphorus derived from zinc dialkyl dithio phosphate having all-secondary alkoxy moieties. 
     
     
         9 . The lubricant composition of  claim 1 , wherein the total amount of phosphorus in the lubricant composition comprises less than about 15% phosphorus derived from zinc dialkyl dithio phosphate having all-secondary alkoxy moieties. 
     
     
         10 . The lubricant composition of  claim 1 , wherein the total amount of phosphorus in the lubricant composition comprises less than about 10% phosphorus derived from zinc dialkyl dithio phosphate having all-secondary alkoxy moieties. 
     
     
         11 . The lubricant composition of  claim 1 , wherein the zinc dialkyl dithio phosphate having a primary alkoxy moiety is present in an amount sufficient to contribute from about 0.03 wt % to about 0.15 wt % phosphorus in the lubricant composition. 
     
     
         12 . The lubricant composition of  claim 1 , wherein the lubricant composition further comprises a zinc dialkyl dithio phosphate having both primary and secondary alkoxy moieties. 
     
     
         13 . The lubricant composition of  claim 12 , wherein the zinc dialkyl dithio phosphate having both primary and secondary alkoxy moieties is present in an amount sufficient to contribute from about 0.03 wt % to about 0.15 wt % of phosphorus in the lubricant composition. 
     
     
         14 . A lubricant composition comprising
 (a) a base oil having a NOACK volatility of from about 5 to about 15 and   (b) the reaction product of:
 (i) about 50 to about 100 mol % of about C1 to about C18 primary alcohol; 
 (ii) up to about 50 mol % of about C3 to about C18 secondary alcohol; 
 (iii) a phosphorus-containing component; and 
 (iv) a zinc-containing component. 
   
     
     
         15 . The lubricant composition of  claim 14 , wherein the phosphorus component comprises phosphorus pentasulfide. 
     
     
         16 . The lubricant composition of  claim 14 , wherein the zinc component comprises zinc oxide. 
     
     
         17 . A method for providing a decrease in catalyst deactivation in an automotive exhaust catalytic converter, comprising lubricating an engine with a lubricant composition comprising:
 (a) a base oil having a NOACK volatility of from about 5 to about 15; and   (b) a zinc dialkyl dithio phosphate having a primary alkoxy moiety, wherein the lubricant composition is essentially free of zinc dialkyl dithio phosphate having all-secondary alkoxy moieties.   
     
     
         18 . A method for decreasing oil consumption in an engine, comprising lubricating an engine with a lubricant composition comprising:
 (a) a base oil having a NOACK volatility of from about 5 to about 15; and   (b) a zinc dialkyl dithio phosphate having a primary alkoxy moiety, wherein the lubricant composition is essentially free of zinc dialkyl dithio phosphate having all-secondary alkoxy moieties.   
     
     
         19 . The method of  claim 18 , wherein the lubricant composition decreases oil consumption compared to a lubricant composition containing zinc dialkyl dithio phosphate having all-secondary alkoxy moieties. 
     
     
         20 . The method of  claim 18 , wherein the engine includes an internal combustion engine having a crankcase and wherein the lubricant composition comprises a crankcase oil present in the crankcase of the engine. 
     
     
         21 . A method for lubricating an engine, comprising:
 contacting said engine with a lubricant composition wherein said lubricant composition comprises:   (a) a base oil having a NOACK volatility of from about 5 to about 15; and   (b) a zinc dialkyl dithio phosphate having a primary alkoxy moiety, wherein the lubricant composition is essentially free of zinc dialkyl dithio phosphate having all-secondary alkoxy moieties.   
     
     
         22 . The method of  claim 21 , wherein the lubricant composition provides decreased oil consumption compared to a lubricant composition containing zinc dialkyl dithio phosphate having all-secondary alkoxy moieties. 
     
     
         23 . The method of  claim 21 , wherein the lubricant composition provides a decrease in catalyst deactivation in an automotive exhaust catalytic converter compared to a lubricant composition containing zinc dialkyl dithio phosphate having all-secondary alkoxy moieties.