Understanding Oil Viscosity Numbers

When it's time to change the oil in your vehicle, you may have no idea what the different numbers on the oil bottle mean. What's the difference between 10W-40 and 5W-30 you might be asking yourself? These are oil viscosity numbers, and they refer to how oil flows at different temperatures.

Viscosity is a measurement of flow resistance. The number that you see on an oil bottle before the "W" is the viscosity at low temperatures while the second number is the oil's viscosity at high temperature. Because oil gets thicker at low temperatures, you want a low first number. Since oil thins at high temperatures, you want a higher second number.

If you have questions about what oil is right for your vehicle, come into Todd Hunzeker Ford Inc located in Soda Springs when it is time to service your vehicle. The service technicians will assist you in choosing the right oil for your particular vehicle.

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