Folks,
I think you’ll find this video interesting because it sounds like dismantling and cleaning of GDI engines is a general issue for VW.
https://youtu.be/RnhUJsZXzmg
Think this is more of an issue for GDI engines in general? I have not heard of other engines needing to be disassembled for cleaning because of carbon deposits.
However, I also found this which partly answered my question:
Is Carbon Buildup a Problem With Direct-Injection Engines?
http://www.autoguide.com/auto-news/2...-engines-.html
"Assuaging potential sky-is-falling fears, Michael Karesh, the developer of TrueDelta.com said carbon buildup is “not an issue for all direct-injected engines” based on the data he collects. His website surveys the owners of around 33,000 different vehicles to acquire relevant and timely data about vehicle reliability and fuel economy among other things."