anyone ever did this service for their N55/N54 engine?? have a friend who's asking if this would be a good idea as regular maintenance.... i dont know enough about the turbo engines.
http://www.e90post.com/forums/showthread.php?t=676488
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Current: 2013 F10 M5 & 2016 Mini JCW
2013 GLK350 (gone), 997.1 GT3RS (gone), 2009 WRX STI (gone), e92 M3 (gone)