Ultra Low Phosphorus Lubricant Composition Incorporating Amine Tungstate

Abstract

A low-phosphorus lubricating composition having less than 600 ppm phosphorus, comprising at least 85 weight % of a lubricating base blend, and an additive comprising the following, as a weight % of the total composition: (1) an amine tungstate compound at an amount which provides about 0.1 to 1400 ppm W; (2) an alkylated diphenylamine at about 0.1-2%; and (3) a zinc dithiocarbamate at about 0.1-2%.

1 . A low-phosphorus lubricating composition having less than 600 ppm phosphorus, comprising at least 85 weight % of a lubricating base blend, and an additive comprising the following, as a weight % of the total composition:
 (1) a tungsten source at an amount which provides about 0.1 to 1400 ppm W;   (2) an alkylated diphenylamine at about 0.1-2%; and   (3) a zinc dithiocarbamate at about 0.1-2%.   
     
     
         2 . The composition of  claim 1 , wherein the tungsten source is an amine tungstate. 
     
     
         3 . The composition of  claim 2 , wherein the amine tungstate compound is an alkylammonium tungstate. 
     
     
         4 . The composition of  claim 1 , wherein the amine tungstate compound is a di-(C 11-14 -branched and linear alkyl) amine tungstate. 
     
     
         5 . The composition of  claim 1 , wherein the tungsten source is at an amount which provides about 200 to 1200 ppm tungsten. 
     
     
         6 . The composition of  claim 1 , wherein the tungsten source is at an amount which provides about 200 to 1200 ppm tungsten. 
     
     
         7 . The composition of  claim 1 , which is substantially free of molybdenum. 
     
     
         8 . The composition of  claim 1 , wherein the additive comprises:
 (1) di-(C 11-14 -branched and linear alkyl) amine tungstate which provides about 0.1 to 1400 ppm W;   (2) an alkylated diphenylamine at about 0.1-2%; and   (3) a zinc dithiocarbamate at about 0.1-2%;   wherein the composition is substantially free of molybdenum.   
     
     
         9 . A method of lubricating an engine with improved inhibition of lead and/or copper corrosion, comprising using the lubricating composition of  claim 1  in an engine.