| abstract |
By containing 30 mass % or more of the mineral oil (A) containing the heavy high-viscosity lubricating oil (A1) based on the total amount of the lubricating oil composition, and further containing the synthetic oil (B) and the phosphate ester (C), the synthetic The content of the oil (B) is less than 70% by mass based on the total amount of the lubricating oil composition, and the content of the phosphoric acid ester (C) in terms of phosphorus atoms is 0.050 to 0.200 based on the total amount of the lubricating oil composition. A lubricating oil composition having a viscosity index of 150 or more by mass % provides a lubricating oil composition having a low temperature dependence and good lubricating properties even when a mineral oil containing a heavy, high-viscosity lubricating oil is used. |