Patent ID: 9410106
Filing Date: 2016-08-09
CPC Classification: C10M,C10N

Claim Text:
1. A lubricating oil composition comprising: a base oil having a kinematic viscosity at 40 degrees C. in a range from 10 mm (A) a phosphorus compound represented by a formula (1) in an amount of 0.001 mass % to 0.3 mass % in terms of a phosphorus content, where: R is a hydrogen atom or an alkyl group having 3 or less carbon atoms; and X is an oxygen atom or a sulfur atom; (B) at least one sulfur compound selected from the group consisting of a thiophosphate compound, a dithiophosphate compound and a sulfur compound (B-2) comprising a dithio (—S—S—) bond in a molecule in an amount of 0.01 mass % to 0.5 mass % in terms of a sulfur content, the sulfur compound (B-2), when added to the base oil in an amount of 1 mass %, leading to a rating of 2 or lower in a copper strip corrosion test under JIS K 2513, at 100 degrees C. for three hours, (C) a carboxylic acid amide with an acid number of 10 mg KOH/g or less in an amount of 0.01 mass % to 0.5 mass %; and (D) a succinimide derivative in an amount of 0.01 mass % to 1 mass %, wherein an acid number of the lubricating oil composition is in a range from 0.01 mg KOH/g to 0.05 mg KOH/g.