Amine tungstates and lubricant compositions

Abstract

This invention relates to lubricating oil additives, and to lubricating oil compositions, their method of preparation, and use. More specifically, this invention relates to several novel lubricating oil additives and compositions which contain a tungsten compound and an antioxidant, namely aminic antioxidants such as a secondary diarylamine or an alkylated phenothiazine. The use of the tungsten compound with the secondary diarylamine and/or the alkylated phenothiazine provides improved oxidation and deposit control to lubricating oil compositions. The lubricating oil compositions of this invention are particularly useful as crankcase and transmission lubricants, gear oils and other high performance lubricant applications.

1 . A lubricating oil composition providing improved performance properties, comprising:
 1) a lubricating oil;   2) at least one oil-soluble or oil-dispersible organo amine tungstate; and   3) an oil-soluble secondary diaryl amine and/or an oil-soluble alkylated phenothiazine;   4) an ashless friction modifier, a metal-containing antiwear additive, an ashless antiwear additive, an extreme pressure agent, a corrosion inhibitor/detergent, a yellow metal deactivator/copper passivating agent, a pour point depressant or mixtures thereof,   and optionally one or more antioxidant, dispersant, detergent, friction modifier, antiwear additive, corrosion inhibitor, metal deactivator, fuel economy agent, viscosity index improver, or mixtures thereof.   
   
   
       2 . The lubricating oil composition of  claim 1 , wherein said composition has a performance property that is better than the same performance property of both a) an analogous composition without 2); and b) an analogous composition without 4). 
   
   
       3 . The lubricating oil composition of  claim 2 , wherein said performance property is oxidative stability. 
   
   
       4 . The lubricating oil composition of  claim 2 , wherein said performance property is anti-friction performance.