LUBRICATING OIL COMPOSITIONS

摘要

Provided is a lubricating oil composition which comprises a base oil and a phosphorus compound having a specific structure and which exhibits lubricity, thermal stability, oxidation stability, discoloration resistance and sludge-formation resistance at high levels.  Also provided is a lubricating oil composition for internal combustion engines which realizes excellent wear resistance, high-temperature detergency and base number retention even when the composition has a low phosphorus content, a low sulfur content, and a low sulfated ash content.