Patent ID: 8207099

Claim:
A crankcase lubricant, comprising: a) a major amount of a base oil; b) an alkali or alkaline earth metal-containing detergent; c) a phosphorus-based wear preventative; d) a surfactant agent having an HLB value ranging from about 4 to about 5 comprising a block or graft co-polymer of the general formula (A-COO) m B, where m in an integer of at least 2 and, A is a polymeric component having a molecular weight of at least 500 and is the residue of an oil-soluble complex mono-carboxylic acid of the general structural formula: in which R is hydrogen or a monovalent hydrocarbon or substituted hydrocarbon group, R 1 is hydrogen or a monovalent C 1 to C 24 hydrocarbon group, R 2 is a divalent C 1 to C 24 hydrocarbon group, n is zero or 1 and p is zero or an integer of up to 200; and B is a polymeric component having a molecular weight of at least 500 and, in the case where m is 2, is the divalent residue of a water-soluble polyalkylene glycol of the general formula: in which R 3 is hydrogen or a C 1 to C 3 alkyl group, q is an integer from 10 to 500, or, in the case where m is greater than 2, is the residue of valency m of a water-soluble polyether polyol of the general formula: in which R 3 and m have their previous significance, r is zero or an integer from 1 to 500, provided that the total number of units in the molecule is at least 10, and R 4 is the residue of an organic compound containing in the molecule m hydrogen atoms reactive with an alkylene oxide: and e) more than about 0.10 weight percent of a monoester of a C 5 to C 30 carboxylic acid as a non-metal friction modifier, wherein the lubricant has a weight ratio of alkali or alkaline earth metal content to phosphorus content, based on a total mass of lubricant, ranging from about 1.6 to about 5.0, and wherein the lubricant passes an E85 emulsion test.