I think it is a good ideal to get a professional fuel injection cleaning
service. I've used runrite service for my other cars
http://www.run-rite.com/industry/fuel_runrite.html
For the engine, nothing beats the Bilstein engine flush.
http://www.redwoodgeneral.com/services/engine-flush.asp
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2007 335 coupe Alpine white, steptronic, sportpack, etc. (gone)
2006 X3 3.0 steptronic Titanium Silver, 2009 E92 335xdrive, next.... Caddy CTS_V!
13 Lincoln MKZ? hmmm.
