Patent ID: 8202829

Claim:
A lubricating composition comprising a major amount of non-synthetic lubricating oil comprising monocycloparaffins in an amount less than about 30% by weight and tetracycloparaffins in an amount of at least 0.8% and less than about 2.0% by weight, relative to the total weight of the composition; and at least about 0.40% by weight of at least one diarylamine, relative to the total weight of the composition, wherein the lubricating composition does not comprise synthetic oils, wherein the at least one diarylamine is selected from the group consisting of diphenylamine, 3-hydroxydiphenylamine, N-phenyl-1,2-phenylenediamine, N-phenyl-1,4-phenylenediamine, monobutyldiphenylamine, butyldiphenylamine, dibutyldiphenylamine, octyldiphenylamine, dioctyldiphenylamine, nonyldiphenylamine, dinonyldiphenylamine, heptyldiphenylamine, diheptyldiphenylamine, methylstyryldiphenylamine, phenyl-beta-naphthylamine, diheptyldiphenylamine, p-oriented styrenated diphenylamine, monotetradecyldiphenylamine, ditetradecyldiphenylamine, monooctyl phenyl-alpha-naphthylamine, monoheptyldiphenylamine, p-oriented styrenated diphenylamine, mixed butyl/octyl alkylated diphenylamines, mixed butyl/styryl alkylated diphenylamines, mixed nonyl/ethyl alkylated diphenylamines, mixed octyl/styryl alkylated diphenylamines, mixed ethyl/methylstyryl alkylated diphenylamines, octyl alkylated phenyl-alpha-naphthylamine, mixed alkylated phenyl-alpha-naphthylamines, and combinations thereof.