Patent ID: 8030257

Claim:
A lubricating oil exhibiting improved resistance to oxidation by hydroperoxide comprising a base oil selected from the group consisting of natural oils, petroleum derived mineral oils, polyalphaolefins, hydrocarbyl aromatics, alkylene oxide polymers and interpolymers, silicon-based oils, esters of phosphorous-containing acids, polymeric tetrahydrofuron, non-conventional oils and mixtures thereof and an effective amount of a catalytic hydroperoxide decomposing antioxidant comprising one or more oil soluble organo metallic compound and/or organo metallic coordination complexes selected from the group consisting of chromium (acetyl acetonate) 3 , chromium (picolinate) 3 , manganese (acetyl acetonate) 3 , MoO 2 (acetyl acetonate) 3 , manganese (acetyl acetonate) 2 and mixtures thereof, said catalytic hydroxide decomposing antioxidant being present in an amount in the range of about 10 to 1000 ppm based on the metal and wherein said catalytic antioxidant improves the resistance to oxidation by hydroperoxide introduced into the lubricating oil via combustion gas blow-by or exhaust gas recirculation in internal combustion engines.