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Old 01-30-2013, 05:53 AM
JoeFromPA JoeFromPA is offline
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Location: West Chester, PA
Join Date: Jan 2007
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Mein Auto: 01 M5, 08 535xit
Originally Posted by UltimateDriving View Post
I never though these DI engines were such a PITA, how much does a carbon buildup costs to clean if you are out of warranty?
All DI engines to one extent or another have carbon build-up issues on the intake side. Driving style and oil choice impacts the build-up, because build-up is a result of two things:

1. Amount of crankcase gases routed back through the intake
2. Tendency of the oil to carbonize as it's being sucked through the intake

In addition, the n54 is a uniquely designed and hard-to-work on twin turbocharged engine. At what point was this ever gonna be anything but a PITA


I've actually been pleasantly surprised at the reliability of these engines now that they are coming up on 6 years old. They're not great, but they are not bad.
F80 m3 - 20k miles as of April 2015....08 535xit - 120k miles
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