Idemitsu Kosan Company, Limited

Tatsuya Hamachi

Shuichi Sakanoue

Provided is a lubricating oil composition for a shock absorber, the lubricating oil composition being capable of emitting fluorescence by ultraviolet irradiation while ensuring thermal stability and abrasion resistance. This lubricating oil composition for a shock absorber contains, as components: (A) a base oil; (B) a hydrocarbon compound having a stilbene structure; and (C) a phosphite ester.

Lubricating oil composition for shock absorber

Provided are a lubricating oil composition containing a mineral oil (1) having a kinematic viscosity at 100&#xb0; C. of 2.5 mm/s or more and 5 mm/s or less, and a polymethacrylate (2) having a functional group containing an oxygen atom in the molecule while having a specific structural unit, which satisfies both high viscosity index and high shear stability, and a lubrication method and a transmission using the lubricating oil composition.

Lubricating oil composition, lubricating method, and transmission

Provided are a lubricating oil composition containing a mineral oil (1) having a kinematic viscosity at 100&#xb0; C. of 2 mm/s or more and less than 2.5 mm/s, and a polymethacrylate (2) having a functional group containing an oxygen atom in the molecule while having a specific structural, unit, which satisfies both high viscosity index and high shear stability, and a lubrication method and a transmission using the lubricating oil composition.

Provided are a lubricating oil composition containing a synthetic oil (1) having a kinematic viscosity at 100&#xb0; C. of 2.5 mm/s or less, and a polymethacrylate (2) having a monovalent functional group containing an oxygen atom in the molecule while having a specific structural unit, which satisfies both high viscosity index and high shear stability, and a lubrication method and a transmission using the lubricating oil composition.

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Chiba, Japan

Tatsuya Hamachi