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The viscosity of multi-weight motor oil is specified using two numbers. The first number is the viscosity when the oil is cold. This is followed by the letter W (which stands for winter, not weight), which is followed by the number that indicates the viscosity when the oil is at operating temperature. The higher the number the thicker the oil. So 5w30 is thicker once the engine reaches full operating temperature than 5w20. Use exactly what your owner's manual states, no matter what any so-called expert tells you.

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Q: What is the difference between 5w-20 and 5w-30 motor oil?
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