Lubricant Composition

Abstract: [Problem] The present invention addresses the problem of providing a lubricant composition which has excellent shear stability and excellent temperature-viscosity characteristics in terms of fuel consumption saving and energy saving of electric vehicles, while exhibiting high heat dissipation performance. [Solution] The present invention provides a lubricant composition which has a kinematic viscosity at 100°C of 4 to 10 mm2/s and contains a lubricant base oil and an ethylene/a-olefin copolymer that has an ethylene molar content of 30% by mole to 70% by mole, a kinematic viscosity at 100°C of 10 to 5,000 mm2/s, a Hazen color number of 30 or less, a molecular weight distribution of 2.5 or less, and a B value of 1.1 or more, wherein: the lubricant base oil is composed of a mineral oil that has a kinematic viscosity at 100°C of 2 to 6 mm2/s, a viscosity index of 105 or more and a pour point of -5°C or less, and/or a synthetic oil that has a kinematic viscosity at 100°C of 1 to 9 mm2/s, a viscosity index of 110 or more and a pour point of -30°C or less. This lubricant composition is used for the purpose of cooling an electric motor and lubricating gears in an electric vehicle.

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