When we start our car on a cold winter day, we want the oil to be very thin so it can instantly lubricate the internal parts. That means their viscosity is designed to change depending on the temperature. Today most oils available at your local auto parts store are multigrade formulas. When comparing various grades of motor oil, it is helpful to know what each of the numbers on the bottle means. Or you could think of viscosity as the thickness of the oil. Motor oil is classified by its viscosity. In this article we will break down what the numbers on the bottle of oil mean, whether your oil will improve your gas mileage and which one is best for your car. There are a number of automotive forums that have started rumors about the quality of 5w20 motor oil. As an Amazon Associate I earn from qualifying purchases.
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