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      09-21-2017, 11:41 AM   #1
fiehlsport
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Thumbs up N55 Carbon Buildup after 70K

There isn't much!



I haven't seen many threads regarding carbon cleaning on the N55, and I can see why.

The valves are perfectly clean, and only a slight amount of buildup on the stems up top.

I might re-evaluate at 100K, but this is very clean for a direct injected motor at 70K. Some VW and Audi products are clogged up at 30K, so I'm very happy.
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      09-21-2017, 02:17 PM   #2
interceptor428
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What fuel are you running, 89 or 90+?
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      09-21-2017, 02:20 PM   #3
fiehlsport
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Quote:
Originally Posted by interceptor428 View Post
What fuel are you running, 89 or 90+?
Been running 93 since 36K. But, I don't think fuel has much to do with it. Fuel doesn't come into play until the combustion chamber with DI cars.
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      09-21-2017, 05:40 PM   #4
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ah yes..good point. Thanks for the feedback!
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      09-24-2017, 08:01 PM   #5
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Thank god. I had a 135i with the N54 and they were gross when I had them cleaned at 60K.
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      09-24-2017, 09:53 PM   #6
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I had mine (335i) cleaned at 50k when I installed methanol injection, wasn't needed yet. I would wait until 100k to do this on a N55.
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      10-16-2017, 12:54 PM   #7
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I've been getting a lot of blow-by, afraid I've gunked mine all up. Need to get a catch can, and then have my valves scoped.
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