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Furthermore, you can mix them with common brands and similar api. The second set of numbers in the sequence (20 and 30 here) denotes the viscosity of the oil when it heats up to 212°f (100°c). Here, both 5w 20 and 5w 30 engine oils might have the same viscosity ratings, but their behavior at 104°f varies, and that makes all the difference. Thus, when the engine reaches its operating temperature 5w, 30.