Lubricating oil composition

A lubricating oil composition having a sulfur content of 0.01 to 0.3 wt. %, a phosphorus content of 0.01 to 0.1 wt. %, and giving a sulfated ash in the range of 0.1 to 1 wt. % and an organic acid metal salt content in the range of 0.2 to 7 wt. %, which comprises

• a) a major amount of a mineral base oil having a sulfur content of at most 0.1 wt. %;
• b) an ashless dispersant comprising an alkenyl- or alkyl-succinimide or a derivative thereof in an amount of 0.01 to 0.3 wt. % in terms of a nitrogen atom content;
• c) a metal-containing detergent containing an organic acid metal salt which is selected from the group consisting of a non-sulfurized alkali metal or alkaline earth metal salt of an alkylsalicylic acid having a TBN of 10 to 350 mgKOH/g and a non-sulfurized alkali metal or alkaline earth metal salt of an alkylphenol derivative having a Mannich base structure, in an amount of 0.1 to 1 wt. % in terms of a sulfated ash content;
• d) a zinc dialkyldithiophosphate in an amount of 0.01 to 0.1 wt. % in terms of a phosphorus content;
• and
• e) an oxidation inhibitor selected from the group consisting of a phenol compound and an amine compound in an amount of 0.01 to 5 wt. %.