The present invention provides a gear oil composition having fuel saving performance and providing gears or bearings with sufficient durability and comprising a base oil comprising a blend of (A) a mineral lubricating base oil having a 100°C kinematic viscosity of 2 to 6 mm2/s, a %CA of 0.5 or less and a tertiary carbon content of 7% or more blended and (B) a solvent-refined mineral lubricating oil having a 100°C kinematic viscosity of 10 to 70 mm2/s in an amount of 2 to 40 percent by mass on the total base oil composition mass basis; (D) zinc dialkyldithiophosphate in an amount of 0.02 to 0.5 percent by mass on the zinc amount basis; and (E) an alkaline earth metal detergent having a base number of 100 mgKOH/g or greater in an amount of 0.1 to 0.5 percent by mass on the metal amount basis, on the gear oil composition mass basis.
本发明提供了一种齿轮油组合物,该组合物具有节油性能,并使齿轮或轴承具有足够的耐用性,它包括一种基础油,该基础油由以下两种油混合而成:(A) 100°C 运动粘度为 2 至 6 mm2/s、%CA 为 0.5 或更低,三级碳含量为 7% 或更高的矿物润滑基础油和 (B) 100°C 运动粘度为 10 至 70 mm2/s 的溶剂精制矿物润滑油的混合物,其质量分数为基础油组合物总质量分数的 2% 至 40%; (D)
二烷基二硫代磷酸锌,其质量分数为 0.(E) 碱基数为 100 mgKOH/g 或更高的碱土
金属洗涤剂,其用量为齿轮油组合物质量的 0.1%至 0.5%(以
金属用量为基准)。