Patent ID: 6294506
Filing Date: 2001-09-25
Classification: C10L,C10M,C10N

Abstract:
A lubricating oil composition comprising:(a) a major amount of an oil of lubricating viscosity;(b) a minor amount of a carbonated sulfurized metal alkyl phenate and;(c) a minor amount of a carbonated metal alkyl aryl sulfonate, wherein the total base equivalents donated by the phenate is more than 85% of the total base equivalents donated by the phenate and sulfonate;(d) a minor amount of a polyamino alkenyl or alkyl succinimide wherein the succinimide comprises the reaction product of:(a) an alkenyl- or alkyl-substituted succinic anhydride derived from a polyolefin having a Mn of from 2000 to 2700 and a Mw/Mn ratio of from 1 to 5; and(b) a polyalkylene polyamine having an average nitrogen atom to molecule ratio of greater than 4.0;wherein the reaction product is post-treated with a cyclic carbonate.