LUBRICATING OIL COMPOSITION

摘要

PROBLEM TO BE SOLVED: To obtain a lubricating oil composition which is obtained by mixing a lubricant base oil with a primary antioxidant and a secondary antioxidant, suppresses abrupt decomposition and evaporation of lubricating oil even in the presence of a bearing metal and is used as a sintered metal bearing oil stably for a long period of time without corroding and degenerating a bearing material or forming a sludge. SOLUTION: The lubricating oil composition is obtained by mixing a lubricant base oil with a diphenylamine-based antioxidant and a phosphite containing at least one phenylester group. The lubricating oil composition not only effectively achieves corrosion prevention of bearing material and formation prevention of sludge but also suppresses abrupt decomposition and evaporation of lubricating oil even in the presence of a bearing metal and is stably usable even under a high-temperature condition for a long period of time when used as a sintered metal bearing oil. COPYRIGHT: (C)2008,JPO&INPIT