Patent ID: 7807610

Claim:
An automotive lubricating oil composition comprising or made by admixing: (A) an oil of lubricating viscosity in a major amount; and (B) as an oil-soluble or oil-dispersible additive component in a minor amount, a 4-oxobutanoic acid having the moiety —CO(CH 2 ) 2 COOH bonded to (i) a group OR 1 , wherein R 1 is a hydrocarbyl group having from 10 to 30 carbon atoms, to provide a half-acid half-ester; or (ii) a group X, wherein X is an aromatic group substituted with at least one hydrocarbyl group having from 10 to 30 carbon atoms to provide a keto-acid; or (iii) a group NR 2 R 3 wherein one or both of R 2 and R 3 is a hydrocarbyl group having from 10 to 30 carbon atoms and one but not both of R 2 and R 3 may be a hydrogen atom, to provide a half-acid half-amide, or a salt thereof.