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No worries. If 10w30 was suited for your current climate then your new mixture will do just fine. If you needed to use 5w30 because the temps are still below zero in your area, then you may want to change to entirely 5w30. I remember hearing about people with LS1's in their Camaros mixing 4 qts of Mobil 1 10w30 and 2 qts of 15w50 in order to achieve a mix that was similar to a 10w40.

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Q: What if you mix oils 10w-30 motor oil with 5w-30 oil on accident?
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