Patent ID: 8110532

Claim:
A lubricant composition, comprising: (a) a Group II and/or Group III base stock of lubricating viscosity; and (b) from 0.5 to 1.5% by weight based on the weight of the lubricant composition of an antioxidant composition consisting of a first antioxidant which is a reaction product of p-cresol with dicyclopentadiene and isobutylene and having a molecular weight [g/mol] of 600-700, and a second antioxidant having the formula: (R 3 ) a —Ar 1 —NH—Ar 2 —(R 4 ) b wherein Ar 1 and Ar 2 are independently aromatic hydrocarbon groups and R 3 and R 4 are independently hydrogen or hydrocarbyl groups having from 6 to about 100 carbon atoms and a and b are independently 0 to 3 but (a+b) is not greater than 4 wherein the weight ratio of the second antioxidant to the first antioxidant is from 1:1 to 19:1, wherein at least 80% by weight of the lubricant composition is base stock a).