Patent ID: 8778858

Claim:
A method for lubricating a transmission, comprising supplying thereto a lubricant comprising: an oil of lubricating viscosity; and a hydrocarbyl amine, the hydrocarbyl group thereof having about 12 to about 22 carbon atoms, said amine having one or two groups in addition to said hydrocarbyl group, on one or more amine nitrogen atoms thereof, such additional group or groups independently being of the structure —R 3 —C(═O)X(R 4 ) c , wherein each R 3 is independently an alkylene group containing 1 to 4 carbon atoms or a group comprising a chain of 2 to 9 carbon atoms interrupted by one or two nitrogen or oxygen atoms within the chain; X is nitrogen or oxygen; c is 2 when X is nitrogen and 1 when X is oxygen; and each R 4 is independently a hydrocarbyl group of 1 to about 20 carbon atoms or a group represented by the formula —R 3 —NHR 5 wherein R 5 is a hydrocarbyl group of about 12 to about 22 carbon atoms, or, if X is nitrogen, R 4 may be H; wherein the amine comprises two groups of the structure —R 3 —C(═O)X(R 4 ) c on an amine nitrogen atom.