Patent ID: 8410032

Claim:
A lubricant composition for a transmission fluid comprising: a). a base oil; b). 2,5-dimercapto-1,3,4-thiadiazole (DMTD), a derivative of DMTD, or mixtures thereof; c). a friction modifier made by: i). reacting an olefin, wherein at least 40% by weight of the olefin is a C 10 -C 36 vinylidene olefin that was reacted under acid-catalysis condition then treated with maleic acid, anhydride, or ester to provide a first reaction product; and ii). aminating the reaction product with an effective amount of a compound containing basic nitrogen to provide the friction modifier, wherein C 10 -C 36 vinylidene olefin is represented by the following formula: wherein R c and R d are independently a (C 3 -C 15 ) alkyl, cycloalkyl or cycloalkenyl, wherein the friction modifier (c) provides from about 50 to about 800 ppm by weight of nitrogen to the lubricant composition based on a total weight of the lubricant composition and wherein a weight ratio of nitrogen (ppm) contributed by the friction modifier (c), to the sulfur (ppm) contributed by said DMTD or DMTD derivative, or mixtures thereof (b), ranges from about 0.25:1 to about 1.25:1.