Patent ID: 8841242

Claim:
A lubricating oil composition comprising an anti-wear agent, said anti-wear agent comprising: a reaction product of a heterocyclic compound and a compound selected from the group consisting of a boron compound and a molybdenum compound; wherein the heterocyclic compound is represented by formula (I) and optionally contains a double bond in a ring part: wherein X 1 , X 2 , X 3 , and X 4 each independently represent N, NH, O, or S; p represents 0 or 1; x and y each independently represent an integer of 0 to 2; u and r each independently represent an integer of 0 to 3; t and w each independently represent an integer of 0 to 3; n and m each independently represent 0 or 1; and k represents an integer of 0 to 3; provided that X 1 , X 2 , X 3 , X 4 , x, y, u, r, t and w are selected such that a base skeleton of the heterocycle of formula (I) is a benzoimidazole, indazole, triazine, or triazole; R 1 to R 4 each independently represent a hydrogen atom bound to a carbon atom, or a hydrocarbon group which may have at least one kind of substituent selected from the group consisting of an amino group, an amide group, an ether group, and a carboxyl group, each substituent being bound to a carbon atom; provided that if p represents 0, R 1 and R 2 do not represent a hydrogen atom simultaneously, and if p represents 1, R 1 to R 4 do not represent a hydrogen atom simultaneously; Y 1 and Y 2 each independently represent a hydrogen atom, a halogen atom, a functional group selected from the group consisting of an amino group, an amide group, a hydroxy group, a carbonyl group, an aldehyde group, a carboxyl group, an ester group, and an ether group, or a hydrocarbon group which may have at least one kind of functional group selected from the functional groups and has a total in carbon atoms of 1 to 150; the reaction product is a reaction product of the heterocyclic compound having a base skeleton of a benzoimidazole, triazole, triazine, or indazole and the boron compound, or the reaction product is a reaction product of the heterocyclic compound having a base skeleton of a triazine or indazole and the molybdenum compound; and a blending amount of the anti-wear agent is 0.1 to 10 mass % based on the total amount of the lubricating oil composition.