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I have a DI engine (Volkswagen 2.0 TSI), the carbon build-up is very annoying / expensive. I think they still have not fixed it, but not entirely sure:

https://forums.vwvortex.com/showthread.php?6984506-What-Happ...

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Oh yeah, I used to have a used BMW with an N54 engine with the same issue. I ended up buying a media blaster, crushed walnut shells and cleaned up the ports preemptively.

CRC intake cleaner seems to work the OK for a homegamer solution. Make sure to follow directions, as they are not obvious. Best used every 20k or so on GDI engines.

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