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The weight of the oil and flow rate. The 5w30 will flow easier when cold than the 20w40. It is 5 weight oil when cold whereas the other is 20 weight when cold. When the oil reaches full operating temperature the 5w30 is 30 weight oil and the 20w40 is 40 weight.

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Q: What is the difference between 5W30 and 20W40 oil?
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