The “10W” part of the designation stands for the oil’s viscosity at low temperatures. The “W” stands for “winter.” A lower number here indicates that the oil will flow more easily at cold temperatures, which is important for ensuring proper lubrication during cold starts.The “40” part of the designation refers to the oil’s viscosity at high temperatures. A higher number in this portion indicates that the Motul 3000 10W40 oil will provide adequate viscosity to protect the engine and its components under high operating temperatures.


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