Patent ID: 7598211

Claim:
A lubricating composition comprising: (a) a major portion of an oil of lubricating viscosity; and (b) about 0.1 to 10 percent by mass of an antiwear additive comprising: (1) an organo borate ester composition formed by reacting about 1 mole fatty oil and about 1.8 moles diethanolamine followed by subsequent reaction with boric acid, wherein the boron content of the organo borate ester composition is between 0.8 and 1.2 wt. % and, wherein the amount of organo borate ester in the lubricating composition is less than about 1.0 percent by mass; and (2) one or more components selected from the group consisting of: (i) a 1,3,4-thiadiazole, (ii) a bisdithiocarbamate compound comprising methylene bis (dibutyldithiocarbamate),wherein the ratio of organo borate ester: bisdithiocarbamate is 1:6 to 15:1; (iii) dithiocarbamates compound comprising molybdenum dialkyldithiocarbamate or zinc dialkyldithiocarbamate, wherein the ratio of organo borate ester: dithiocarbamate is 1:15 to 15:1 (iv) a phosphorodithioate compound comprising primary alkyl zincdithiophosphate, wherein the ratio of organo borate ester: phosphorodithioate is 1:15 to 15:1; and (v) phosphorodithioate esters compound comprising dialkyl dithiophosphate, wherein the ratio of organo borte ester: phosphorodithioate ester is 1:15 to 15:1; and (vi) a non-sulfur molybdenum additive prepared by reacting (a) about 1.0 mole of fatty oil having 12 or more carbon atoms, (b) about 1.0 to 2.5 moles diethanolamine and (c) a molybdenum source, wherein the ratio of organo borate ester; non sulfur molybdenum additive is 1:15 to 15:1.