Patent ID: 6627583
Filing Date: 2003-09-30
Classification: C10M,C10N,F02B

Abstract:
An engine oil composition comprising a major amount of lubricating base oil and, as essential components, on the basis of the total weight of the composition,(a) 0.01 to 30% by weight of an overbasic oil-soluble metal salt produced by the process consisting essentially of the reaction of an oil-soluble metal salt with an alkaline earth metal oxide or hydroxide in the presence of boric acid or boric acid anhydride, said oil-soluble metal salt being selected from the group consisting of alkaline-earth metal salicylates, alkaline-earth metal phenates, and alkaline-earth-metal phosphonates; (b) 0.01 to 5% by weight of a molybdenum dithiocarbamate, and (c) 0.01 to 5% by weight of an antioxidant selected from the group consisting of phenolic, amine, sulfur, zinc thiophosphate and phenothiazine antioxidants.