Patent ID: 8450255

Claim:
A functional fluid comprising: at least one oil of lubricating viscosity; at least one detergent, the detergent contributing an amount of metal to the functional fluid equal to a concentration in the range from about 0.015 to about 1% by weight of the functional fluid, the detergent contributing an amount of basicity to the functional fluid equal to a total base number in the range from about 0.3 to about 2; and about 1 to about 3 percent by weight of at least one friction modifier, the friction modifier comprising at least two hydrocarbyl groups attached to a polar group or atom, the friction modifier being an amide represented by the formula R 1 R 2 N—C(X)R 3 wherein X is O, R 1 and R 2 are each independently hydrocarbyl groups, and R 3 is a hydroxyalkyl group or a group formed by the condensation of the hydroxyalkyl group, through a hydroxyl group thereof, with an acylating agent.