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15w20 is slightly thicker thand 10w40, .... but neither oil is used that often any more due to 5w30 and 10W30 motor oils. Unless you have a product purchased in the past five years and the manufacturer specifically calls for it .... use the other two weights I have recommended

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14y ago
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Q: What is the difference between 15w20 and10w40 motor oil?
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