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US 2001/0044387 A1Published application
Engine oil composition
AssigneeNippon Mitsubishi Oil Corporation
InventorsKiyoshi Inoue, Jinichi Igarashi, Mituaki Ishimaru, Mineo Kagaya, Masakuni Hirata
Life of this patent
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Abstract
An engine oil composition characterized by containing a major amount of lubricating base oil and (a) 0.01 to 30% by weight of an overbasic oil-soluble metal salt prepared by use of an alkaline-earth metal borate, (b) 0.01 to 5% by weight of a molybdenum dithiocarbamate, and (c) 0.01 to 5% by weight of an antioxidant as essential components, on the basis of the total amount of the composition.
Claims4
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 which is the reaction product 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 with an alkaline-earth metal oxide or hydroxide in the presence of boric acid or boric acid anhydride.
- (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.
Dependencies are inferred from the claim text.