| 摘要 |
PROBLEM TO BE SOLVED: To provide: a lubricating oil composition for an engine made of an aluminum alloy in which abrasion resistance to a sliding part is excellent in the engine in which the sliding part is the aluminum alloy, and that can decrease ZnDTP and a metal based detergent containing phosphorus voluminously while maintaining the abrasion resistance to the aluminum alloy; and a lubrication method using the same.SOLUTION: A lubricating oil composition comprises a base oil, a succinimide compound and a sulfur-containing heterocyclic compound represented by general formula (I), and has a sulfur content of 0.10 to 1.00 mass% relative to the composition and a phosphorus content of less than 0.03 mass% and a sulfated ash content of less than 0.3 mass% relative to the composition. In the formula, As is a sulfur-containing heterocycle; R1 and R2 are each independently a hydrogen atom, an amino group, a 1-50C hydrocarbon group which is selected from alkyl, cycloalkyl, alkenyl, cycloalkenyl and aryl, or a 1-50C hetero atom-containing group that includes an atom selected from oxygen, nitrogen and sulfur when they are the hydrocarbon group; and k, l, m and n are each independently an integer of 0 to 5. |
