Patent ID: 8865633
Filing Date: 2014-10-21
Classification: C10M,C10N

Abstract:
1. A gear oil composition comprising: a) a major amount of a base oil having a lubricating viscosity comprising from about 55 wt. % to less than 100 wt. % bright stock base oil; b) a polysulfide extreme pressure agent; and c) a reaction product of an acylated olefin copolymer and 4-anilino-4′-nitroazobenzene in an amount ranging from greater than about 1.0 wt. % to less than about 3.0 wt. % based on a total weight of the gear oil composition, wherein the acylated olefin copolymer has grafted thereon from 0.3 to 0.75 carboxylic groups per 1000 number average molecular weight units of olefin copolymer and wherein the olefin copolymer has a number average molecular weight of between about 40,000 and 150,000, wherein the amounts of components (b) and (c) are sufficient to provide a carbon/varnish rating of at least 7.5 and a sludge rating of at least 9.4 according to ASTM D5704 (L60-1) using a SAJ2360 procedure.