| 主权项 |
1. A lubricating oil composition comprising:
as constituent (a), 0.5 to 1.5 mass % of a mono or diester of glycerin and a straight-chain or branched fatty acid of carbon number 6 to 20 having a saturated hydrocarbyl group; as constituent (b), 0.1 to 0.5 mass % of a triazole derivative represented by general formula (1):wherein R1 is hydrogen or a hydrocarbyl group of carbon number 1 to 3, R2 and R3 are respectively independently hydrogen or a hydrocarbyl group of carbon number 1 to 20, which may contain an oxygen atom, sulphur atom or nitrogen atom; and,
as constituent (c), 0.01 to 0.2 mass %, calculated as phosphorus, of a mixture of primary zinc dialkyl dithiophosphate whose alkyl group is a primary hydrocarbyl group and a secondary zinc dialkyl dithiophosphate whose alkyl group is a secondary hydrocarbyl group;wherein the ratio of constituent (a)/constituent (b) is 1.5 to 8. |
