Patent ID: 8071515

Claim:
A lubricating oil composition comprising a base oil for a lubricating oil, (A) a fatty acid partial ester compound, (B) at least one compound selected from the group consisting of (b1) an aliphatic amine compound and (b2) an acid amide compound, (C) a benzotriazole derivative represented by Formula (I): wherein in Formula (I), R 1 and R 2 each are independently a hydrocarbyl group having 1 to 20 carbon atoms which may comprise an oxygen atom, a sulfur atom or a nitrogen atom, and (D) a succinimide compound which is represented by Formula (II) or Formula (III): wherein R 3 , R 5 and R 6 are an alkenyl group or an alkyl group each having a number average molecular weight of 500 to 3,000, and R 5 and R 6 may be the same or different; R 4 , R 7 and R 8 each are an alkylene group having 2 to 5 carbon atoms, and R 7 and R 8 may be the same or different; r represents an integer of 1 to 10; and s represents 0 or an integer of 1 to 10; and in which (d1) a polybutenylsuccinbisimide compound comprising a polybutenyl group having a number average molecular weight of 1,500 or more accounts for 70% by mass or more based on the whole amount of (D), the lubricating oil composition comprising 0.01 to 0.1% by mass of the component (C) and 0.5 to 15% by mass of the component (D), wherein the blending amount of the component (A) is 0.05% by mass or more, and the blending amount of the component (B) is 0.05% by mass or more, and the total amount of component (A) and component (B) is from 0.5 to 1.5% by mass, based on the lubricating oil composition; wherein the component (A) is a partial ester obtained by reacting aliphatic polyhydric alcohol with fatty acid having a linear or branched hydrocarbon group having 6 to 30 carbon atoms; wherein the component (b1) is an amine compound having a linear or branched hydrocarbon group having 6 to 30 carbon atoms; wherein the component (b2) is oleic acid monoethanolamide, oleic acid diethanolamide, oleic acid monopropanolamide, oleic acid dipropanolamide, or mixture thereof.