What Do Motor Oil Viscosity Ratings Mean?

The first place to start might be an explanation of viscosity. It simply means the thickness of a fluid. Temperature and your engine’s specifications determine suitable motor oil viscosity.

The exact numbers imprinted on a bottle of multi-grade motor oil tell you cold and hot weather viscosity. When you look at a bottle that is 10W40, for example, the first number represents the thickness of the oil in cold weather. The lower the number, the thinner - or less viscous - the oil is. Thinner oil runs better at low temperatures. The "W" stands for winter. The last number indicates the thickness of the oil in hot weather or when the engine’s warmed up.

Feel free to stop by the Wichita Falls Ford service department when you’re in town. One of our experienced service technicians will be happy to answer your questions. We want to help you keep your car running for a long time.

Categories: Service

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