Thread: mixing engine oil question=-
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Old 12-07-2011, 02:32 PM   #1
jamesmetairie
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mixing engine oil question=-
1998 Lumina with about 165k. Ran 10w30 for many years.
Now I have a 5 quart bottle of castrol 5w30 and I can,t get a refund.
Is it safe to use it in the Lumina and switch back to 10w30 in the future ?
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