| abstract |
Provided are a lubricating oil additive having good antioxidant performance and low corrosiveness, and a lubricating oil composition containing the same. An organophosphorus compound excluding a pentavalent and / or hexavalent inorganic molybdenum compound and an acidic phosphate, particularly the following general formula (1) [Chemical 1] (H, k, m, n is a number of 0 or 1, and when n is 0, it becomes a number of h + k + m = 0-3, and when n is 1, it becomes a number of h + k + m = 0-2, R 1 to R 3 represent a hydrogen atom or a hydrocarbon group, and R 1 to R 3 do not simultaneously become a hydrogen atom.) A lubricating oil additive comprising a phosphomolybdenum compound obtained by reacting with an acidic organic phosphorus compound represented by the formula: [Selection figure] None |