A succinimide compound, additive for lubricating oil and lubricating oil compositions

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PROBLEM TO BE SOLVED : To provide a new succinimide compound useful for applications to an ashless dispersant in a lubricating oil for an internal-combustion engine, etc.SOLUTION : A succinimide compound is represented by general formula (1), wherein Ris an alkyl group or an alkenyl group having a number-average molecular weight of ≥500 and <5, 000; and R-Rare each represented by any of the following formulas (2) to (4) : -O(CH)CH(2) -(CH)CH (3) and -OSi(CH)CH (4) (wherein a to c are each an integer of 0-3).