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Both have similar cold flow abilities but the 5w20 is thinner than 5w30 at operating temperatures. Typically 5w20 will be thinner across the whole temperature range than 5w30, but the cold flow ability is close to the same, thus the 5w rating on both.

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15y ago
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Q: What is the difference between 5w 20 and 5w 30 oil?
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