Patent ID: 7629302

Claim:
A lubricating oil additive consisting of: a lubricant base oil, (A) a salicylate detergent and (B) a metal detergent other than any salicylate detergent, wherein the salicylate detergent (A) is a (per) basic salt of an alkali metal or alkaline earth metal salicylate represented by the general formula (1): wherein one of R 1 and R 2 in the general formula (1) is a hydrocarbon which has 10 to 40 carbon atoms, and the other is a hydrocarbon which has less than 10 carbon atoms, M represents an alkali metal or alkaline earth metal, and n is 1 or 2 in accordance with the valence of the metal, the component (A) has a metal ratio of 2.3 or more and 6 or less, and component (B) is at least one selected from alkali metal or alkaline earth metal sulfonates and (per)basic salts thereof which has a metal ratio of 1 or more and 20 or less.