LUBRICATING OIL COMPOSITION

摘要

PROBLEM TO BE SOLVED: To provide a lubricating oil composition exhibiting a maximum friction reducing effect by optimizing a base oil and an additive other than a friction modifier used for a lubricating oil composition, especially for a lubricating oil for an internal combustion engine.SOLUTION: In a lubricating oil composition, a base oil (A), in which a sulfur content is 0.03 mass% or more and the mass ratio of an aromatic content (%C) to the sulfur content [%C(mass%)/sulfur content (mass%)] is 30 or less, contains 3 mass% or less of a metal salicylate-based cleaning agent (B) as an amount of an alkali metal or an alkaline earth metal on the basis of the total amount of the composition.