Patent ID: 8222191
Filing Date: 2012-07-17
Classification: C10M,C10N

Abstract:
1. A method for lubricating a mechanical device, wherein the mechanical device is a hydraulic system or a turbine, the method comprising supplying the mechanical device with a lubricating composition comprising: (a) an oil of lubricating viscosity; (b) about 0.1 to about 1.5 wt % of a metal containing dispersant, wherein the metal is zinc, and wherein the metal containing dispersant is a N-substituted long chain alkenyl succinimide or long chain alkenyl ester, partial ester or salt thereof; (c) about 0.2 to about 1 wt % of a metal di-hydrocarbyl-substituted dithiophosphate, wherein at least one hydrocarbyl group is a 2-ethylhexyl group, and wherein the metal is zinc; and (d) optionally one or more additives comprising a detergent, an antioxidant, a corrosion inhibitor, a carboxylic acid or anhydride, or mixtures thereof.