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Old 09-12-2016, 08:17 PM
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Accidentally added 5W20 engine oil

Engine oil was a bit low so I added a quart of synthetic oil then realized I bought the wrong one(5W20). I've only had synthetic 5W30 all these years. Would this be a problem or is it ok to wait until the next OC and fill it back up with 5W30?
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Old 09-12-2016, 08:35 PM
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It'll be fine. I used a combination of weights when I first bought my X5. No problems.
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Old 09-13-2016, 12:20 PM
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Don't loose your sleep over this. It's fine.
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Old 09-16-2016, 09:51 AM
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Actually, the 20 weight refers to temp and cool down. SO, a lighter oil will not adhere to your valves and parts like a 30 weight during full temp operation and during cool down. It's OK, but I wouldn't drive 15K miles on it either.
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Old 09-16-2016, 11:31 AM
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Quote:
Originally Posted by Bmwtvboy View Post
Actually, the 20 weight refers to temp and cool down. SO, a lighter oil will not adhere to your valves and parts like a 30 weight during full temp operation and during cool down. It's OK, but I wouldn't drive 15K miles on it either.
I wouldn't drive 15k miles on any oil, under any circumstance.

OP, you'll be fine to go your regular service interval. Mine are ~5000-7500 miles depending on the oil I used. 1 quart of mis-matched oil won't hurt anything. Maybe if you were tracking it and frequently seeing extended periods of red lining and the like I'd be more concerned. But as a daily driver... "don't worry, be happy."
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Old 09-16-2016, 11:39 AM
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Geez, worse case the one quart will create new blend of roughly 5 25 or so weight with the rest of the 5 30 that was already in there. People make there own blends all the time on BITOG. No big deal.
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