Ultra Low Phosphorus Lubricant Composition Incorporating Amine Tungstate
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.