Patent ID: 7772169

Claim:
A low-ash, low-phosphorus lubricant composition suitable for use in a stationary gas engine, comprising: (a) a mineral oil of lubricating viscosity; (b) about 2 to about 6 percent by weight of a succinimide dispersant wherein the amine-derived moiety thereof is a condensed polyamine; (c) 1.0 to about 4.0 percent by weight of a hindered, ester-substituted phenol antioxidant represented by the formula wherein R 3 is a straight chain or branched chain alkyl group containing 2 to 8 carbon atoms; and (d) at least one metal-containing sulfonate detergent or metal-containing phenate detergent, in an amount which provides 1.2 to 2.1 percent by weight of said sulfonate or phenate moieties exclusive of the weight of the metal moieties; said lubricant containing up to about 0.06 percent by weight phosphorus and up to about 1.25 percent sulfated ash, wherein the phenate detergent is other than a salicylate detergent.