A method for stabilizing a lubricating oil.

摘要

Lubricating oils are stabilized against oxidative degradation by the use of a stabilizer system comprising (A) an amine wherein the amine is a substituted benzylamine, or a substituted 1-amino-1,2,3,4-tetrahydronaphthalene, (B) a metal deactivator and (C) a metal or metal salt. Optionally a metal deactivator can be incorporated into the system. The preferred substitute benzylamine is N-(alphamethylbenzyl)aniline, the preferred naphthalamine is phenyl-alphanaphthalamine.