Patent ID: 7829511

Claim:
A stabilized lubricant composition for use in an environment where iron-catalyzed oxidation reactions can take place comprising: (A) at least one lubricating base oil; (B) at least one organophosphite compound selected from the group consisting of: (i) triisodecylphosphite, (ii) diisodecyl pentaerythritol diphosphite and (iii) dilauryl phosphite; (C) a mixture of mono-, di-, and tri-nonylated diphenyl amines and (D) octyl 3-[3,5-di(tert-butyl)-4-hydroxyphenyl]propanoate, wherein (B), (C) and (D) are present as a combination of primary antioxidants and phosphite, said combination consisting of about 15 to about 50 weight percent of (B), about 33 to about 55 weight percent of (C) and about 17 to about 30 weight percent of (D), based on total weight of the combination of primary antioxidants and phosphite, and wherein the combination of primary antioxidants and phosphite is present in the lubricant composition from about 0.25 to about 1 weight percent, based on the total weight of the lubricant composition.