| abstract |
Provided is a lubricating oil composition that achieves both fuel economy and extreme pressure, and has shear stability, oxidation stability, and wear resistance. SOLUTION: At least two kinds selected from base oils, viscosity index improvers, molybdenum friction modifiers, boron-containing dispersants, sulfur extreme pressure agents, phosphorus extreme pressure agents, and sulfur-phosphorus extreme pressure agents. The base oil is composed only of synthetic oil, and the base oil has a kinematic viscosity at 100 ° C. of 3 mm 2 / s to 10 mm 2 / s, improving the viscosity index The agent is a resin having a number average molecular weight (Mn) of 1,000 to 10,000, and boron atoms (B) contained in the boron-containing dispersant and molybdenum atoms (Mo) contained in the molybdenum friction modifier, The mass ratio [(B) / (Mo)] is 1 or more and 5 or less, and the mass ratio [(S) / (P) between the sulfur atom (S) and the phosphorus atom (P) contained in the extreme pressure agent. ] Is a lubricating oil composition characterized by being 10 or more and 20 or less. [Selection figure] None |