FRICTION MODIFIERS FOR ENGINE OIL COMPOSITION

摘要

A lubricating oil composition which exhibits improved fuel economy and fue l economy retention which contains a mono-, di- or triester of a tertiary hydroxyl amine and a fatty acid as a friction modifying fuel economy additive. In particula r, the additive comprises an effective amount of ester formed as the reaction produ ct of (i) a tertiary amine of the formula R1R2R3N wherein R1, R2 and R3 each represent a C2-C4 hydroxyalkyl group with (ii) a saturated or unsaturated fatty acid having 10 to 30 carbon atoms; wherein the ester is a mixture of mono-, di and tri-esters, th e mixture comprising about 30 to 60 wt.% diester, 10 to 40 wt.% monoester and 10 to 40 wt.% triester.