To provide a lubricating oil composition that achieves both suppression of catalyst poisoning and enhancement of abrasion resistance in an internal combustion engine equipped with an oxidation catalyst or a three-way catalyst.
The lubricating oil composition comprises a lubricating base oil and at least one phosphorous compound selected from among metal salts of phosphorous compounds represented by formulae (1) and (2) with the content thereof of 0.005-0.5 mass% in terms of the phosphorus element based on the whole amount of the lubricating oil composition. In the formulae, R1 and R4 are each a 1-30C hydrocarbon group or a group containing at least one selected from among sulfur, oxygen and nitrogen; R2, R3, R5 and R6 are each a hydrogen atom, a 1-30C hydrocarbon group or a group containing at least one selected from among sulfur, oxygen and nitrogen; and m and n are each 0 or 1.
JP2005002214A | 2005-01-06 | |||
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Shiro Terasaki
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