Patent ID: 9683194
Date: 2017-06-20
CPC Classifications: C10M,C10N

Claim:
1. A lubricant composition comprising a major amount of an oil of lubricating viscosity; (a) 0.3 to 5 percent by weight of a dispersant comprising a quaternary ammonium salt; (b) 0.1 to 1.5 percent by weight of a zinc dialkyldithiophosphate; (c) 0.5 to 1.0 percent by weight of a phosphorus-containing compound that is not a zinc dialkyldithiophosphate, comprising an alkyl phosphite; (d) 0.5 to 1.0 percent by weight of a derivative of a hydroxyl-carboxylic acid and an alcohol; and (e) 1.0 to 5 percent by weight of a non-quaternized dispersant comprising a succinimide dispersant prepared from PIB and a polyether polyamine; wherein said percentages are based on the overall lubricant composition; and wherein the weight ratio of component (c) to component (b) is at least 1.5:1.