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10W30 is.

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It really depends what you are asking. Actually at operating engine temp these two oils are identical. The 5W30 flows better in the cold than the 10W30 oil. The benefit of the 5W30 oil is its' ability to build oil pressure and protect the engine under cold operating conditions. Basically a 5W30 oil covers a wider range of temperatures than a 10W30 oil and is better suited for year round use where climates can shift from extreme colds to extreme highs.

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Q: Which oil is thicker 10w30?
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