Patent ID: 7989407

Claim:
A lubricating oil exhibiting improved resistance to oxidation and deposit/sludge formation comprising a major amount of lubricant base oil and an effective amount of a catalytic antioxidant comprising one or more oil soluble polymetal organometallic compounds containing two or more metals having more than one oxidation state above the ground state, said metals being complexed, bonded or associated with i. two or more anions; ii. one or more polydentate ligands; iii. one or more anions and one or more ligands; or, iv. mixtures thereof wherein the metals are selected from the group consisting of transition metal elements 21 through 30, excluding nickel, elements 39 through 48 excluding molybdenum, elements 72 through 80, and mixtures thereof; and provided the anion and/or ligand does not itself render the metals inactive, decompose or cause polymerization of the polymetal organometallic compound and further provided that when the metals are copper the ligand is not acetyl acetonate.