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Discussion Starter · #1 ·
i have a few bottles of 10w30 left from my last oil change..would it be bad if i mixed it w/ 5w30. both are mobile 1 full syntetic btw
 

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Zettai Unmei Mokushiroku
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You should have no problems with mixing the same brand's motor oils. The oil will act more like 10w30, but it doesn't matter since you live in CA.
 
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