Carbon build-up in DI engines

FlyByGTI

As DLSTR said, this is definitely an issue with the GTI platform (I had it in mine). The only way that I've found, by researching it, to avoid the build up was to really get on it. VW actually recommends driving their DI cars above 3k for long periods of time (at least 20 minutes) each time you drive the car to help avoid buildup. There are many people I know who will actually stay in 5th vs 6th on the highway to work to help keep it down. Problem is that once you get that build up, you're pretty much stuck and need to clean the valves. As weird as it sounds, CLR worked wonders with really pulling that build up off.

Essentially if you go DI, just make sure you actually drive it like it should be driven and that should keep you from having to do valve cleanings for longer periods of time.

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