Patent ID: 6103673
Filing Date: 2000-08-15
Classification: C10M,C10N

Abstract:
A composition comprising:(a) a major amount of an oil of lubricating viscosity;(b) a viscosity modifying amount of a shear stable viscosity modifier;(c) at least about 0.1 percent by weight of an overbased metal salt, wherein said overbased salt contributes about 0.5 to about 10 Total Base Number to the composition;(d) at least about 0.1 percent by weight of at least one phosphorus compound; and(e) about 0.1 to 0.45 percent by weight of a combination of at least two friction modifiers, at least one of said friction modifiers being selected from the group consisting of zinc salts of fatty acids having at least 10 carbon atoms, hydrocarbyl imidazolines containing at least 12 carbon atoms in the hydrocarbyl group, and borated epoxides; the amount of the friction modifier from said group being at least about 0.03 percent by weight of the composition;provided that the total amount of the friction modifiers is limited to those amounts which provide a metal-to-metal coefficient of friction of at least 0.120 as measured at 110.degree. C. by ASTM-G-77, using the composition as a lubricant.