Different oil weight how bad?
09-06-2011, 08:58 PM
#1
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Different oil weight how bad?
So I just noticed that yesterday I put 4 quarts of 5w-30 and 2 quarts of 15w-40 in my car how bad is that should I change out now or is it alright for 3k miles?
09-06-2011, 09:06 PM
#2
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While that weight is definitely not recommended it is mixed in with mostly the much thinner 5w-30. As long as the outside temps don't drop too much down there I think you should be fine until the next oil change. Just be sure to warm the car up completely before jumping on it at all (which one should do anyway regardless of oil weight). 
09-06-2011, 09:17 PM
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While that weight is definitely not recommended it is mixed in with mostly the much thinner 5w-30. As long as the outside temps don't drop too much down there I think you should be fine until the next oil change. Just be sure to warm the car up completely before jumping on it at all (which one should do anyway regardless of oil weight).
09-07-2011, 01:18 AM
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CI 6,7,8,9,11 Vet
St. Jude Donor '08
Your GOOD! drive it like you stole it!
Seriously,, NO Harm done!
Seriously,, NO Harm done!
09-07-2011, 05:30 PM
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2020 C6 of the Year Finalist - Unmodified
St. Jude Donor '08-'09-'10-'11-'12-'13-'14-'15-'16,'17,'18-'19-'20-'21-'22
Actually NOT a bad idea to put one quart of 15W-40 in at each oil change, same brand synthetic of course, to get a little extra zinc dithiophosphate in the lube.
09-08-2011, 07:28 AM
#11
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While that weight is definitely not recommended it is mixed in with mostly the much thinner 5w-30. As long as the outside temps don't drop too much down there I think you should be fine until the next oil change. Just be sure to warm the car up completely before jumping on it at all (which one should do anyway regardless of oil weight).
I have done it myself on rare occasion. No biggie.
09-08-2011, 03:32 PM
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St. Jude Donor '13
Your oil is probably about a 10W-35 right now, not a big deal. I just would't drive it up north to Wisconsin in winter with that.
09-08-2011, 04:01 PM
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