As an FYI this is a problem with all direct injection cars, both petrol and diesel.
Petrol engines used to inject fuel through the intake manifold which washed the intake valves, however with the evolution of combustion engines and the ever increasing need for fuel efficiency and power manufacturers have decided direct injection is the way forward.
This unfortunately imo is actually is not necessarily true for the life of the engine due to this gumming up of the intake tract. As the engine ages and the intake tract carbons up the efficiency does decrease somewhat.
Lexus and new ford engines (believe it might be the 2.0 turbo) have additional injectors in the intake tract to remove the carbon, though I believe this only happens on long journeys and light throttle usage.
The EA888 engine isn't unique basically.
The best way to rectify it is to have regular walnut blasting every few years. It's a simple job and there is plenty of specialists up and down the country who can carry this out. Beauty of VW's is their is a lot of them and lots of knowledge to keep them tip top.
Subaru have been using direct and port injection to prevent the problem for years. They put on on the engine in the GT86/BRZ which launched in 2012.
People don't consider this stuff when buying a new car. But years down the road it is a big thing.
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