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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > Mechanical Maintenance: Break-in / Oil & Fluids / Servicing / Warranty > N51: second, more severe cylinder misfire right after oil change. Time to worry?



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      09-28-2015, 10:28 AM   #1
StabPreflop
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N51: second, more severe cylinder misfire right after oil change. Time to worry?

So.. I have an '08 328xi SULEV sedan at 90k. Car has run great for years, except that this year, I'm on my second misfiring cylinder. The first time was in February and I was 200+ miles from home. I was able to drive home on the other 5 cylinders without issue, then have the ignition coil replaced. The second time was today; this time, in addition to the error code, the car was making such a rough clunking noise and shaking at idle, that I was debating whether to limp the ~1mi to the shop or have it towed. (I ended up limping...)

What worries me is that both incidents happened about a week or two after an oil change. Those two most recent oil changes are the only times anything but the BMW-branded oil has gone in the car. I used to order it online and bring it to the shop. In February, I decided to just let them use their own oil, after they assured me it was the correct LL01 synthetic for the car. This time (Sept 16th), I asked specifically for Mobil-1 to be used, which they said was no problem.

Anyway, is it plausible that using the wrong oil could cause these issues? What if they did use Mobil-1, but not the right variety (just guessing here), like 5W instead of 0W? And if so, should I be worried about much worse issues to come?
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      09-28-2015, 10:37 AM   #2
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Oil would have nothing to do with a misfire, it just so happened to fail after the oil change. Instead of replacing one at a time, replace all 6 of them and be done with it.
BMW now is saying you should replace all the Bosch coils with Delphi now,
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      09-28-2015, 11:02 AM   #3
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Whew, thanks a lot!
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      09-29-2015, 10:42 PM   #4
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coils tend to fail in group. When they start to go, expect to change all 6 in short order.
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      09-30-2015, 11:22 AM   #5
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What state do you live in? You have a SULEV warranty in that case so it shouldn't cost you anything I believe.
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      10-06-2015, 09:13 AM   #6
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Quote:
Originally Posted by Eagle1oh7 View Post
What state do you live in? You have a SULEV warranty in that case so it shouldn't cost you anything I believe.
Wait, really? I had no idea about this... haven't been to the dealership in years. I definitely have the SULEV version of the car, in New York State...
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      10-06-2015, 09:15 AM   #7
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Quote:
Originally Posted by StabPreflop
Quote:
Originally Posted by Eagle1oh7 View Post
What state do you live in? You have a SULEV warranty in that case so it shouldn't cost you anything I believe.
Wait, really? I had no idea about this... haven't been to the dealership in years. I definitely have the SULEV version of the car, in New York State...
Yes. Look at the owners manual, there should be additional information for you to read up.
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      10-06-2015, 09:47 AM   #8
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I was just looking through that manual the other day, still failed to notice this. Well, at least I only paid my own money to change two of them, hehe. Thanks again.
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      10-06-2015, 12:41 PM   #9
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The warranty book should say that emissions related repairs on a SULEV are covered for 15 years or 150,000 miles if the car was originally sold in Connecticut, Maine, Maryland, Massachusetts, New Jersey, New Mexico, New York, Oregon, Pennsylvania, Rhode Island, Vermont, Washington, and DC.
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