Patent ID: 7648949
Filing Date: 2010-01-19
Classification: C10M,C10N

Abstract:
1. A low phosphorus internal combustion engine lubricant composition comprising: (a) an oil of lubricating viscosity; (b) an oil soluble cobalt complex or salt; and (c) a succinimide dispersant; and (d) a high TBN calcium sulfonate detergent; wherein (b) the oil soluble cobalt complex or salt is selected from the group consisting of hydrocarbyl substituted cobalt sulfanyl alkanoates, hydrocarbyl substituted cobalt sulfonates, hydrocarbyl substituted cobalt salicylaldimines, cobalt di-hydrocarbyldithiocarbamates, and hydrocarbyl substituted cobaltdithiophosphates; and wherein the amount of (b) the cobalt complex or salt is present in an amount to deliver about 25 to about 400 ppm by weight cobalt; wherein the composition further comprises a zinc dihydrocarbyldithiophosphate of which at least about 50 percent of the alkyl groups thereof are secondary alkyl groups; wherein the composition has a sulfated ash content of from 0.4 to 1.2 percent by weight.