Patent ID: 7563752

Claim:
A lubricating oil composition comprising a lubricating base oil, (A) an alkali metal or alkaline earth metal salicylate containing at least one type of compound selected from those represented by formula (1) below and/or an overbased or basic salt thereof in an amount of 0.005 to 5 percent by mass in terms of metal, (B) a phosphorus-containing anti-wear agent in an amount of 0.005 to 0.2 percent by mass in terms of phosphorus, and (C) an amide compound represented by formula (2) in an amount of 0.01 to 1 percent by mass and containing sulfur in a total amount of 0.3 percent by mass or less, based on the total mass of the composition: wherein R 1 is a hydrocarbon group having 1 to 40 carbon atoms, R 2 is hydrogen or a hydrocarbon group having 1 to 40 carbon atoms, which hydrocarbon groups may contain oxygen or nitrogen, M is an alkali metal or alkaline earth metal, and n is an integer of 1 or 2 depending on the valence of the metal; and wherein R 3 is a hydrocarbon group having 6 to 40 carbon atoms, and R 4 and R 5 may be the same or different and are each independently hydrogen or a hydrocarbon group having 1 to 40 carbon atoms, wherein Component (B) is a zinc salt of a phosphorus compound of formula (4) wherein X 4 , X 5 , and X 6 are each independently oxygen or sulfur, X 7 is oxygen, at least one of X 4 , X 5 , and X 6 is oxygen, and two of R 8 , R 9 , and R 10 are each independently a hydrocarbon group having 1 to 30 carbon atoms and the rest hydrogen, and wherein a sulfated ash content of the lubricating oil composition is 1.0 percent by mass or less.