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Originally Posted by kenneth
Wooo les boys! Trying to sell a car here 
Seriously though, intake valve cleaning is required for ALL DI (direct injection) engines, and that means your Golf R may eventually require this cleaning too Glen, ha ha!
While DI engines are quite the future in terms of performance and efficiency (better mileage) the obvious downside is that the fuel is injected directly in the cylinders, without passing through the intake valves, and hence cleaning agents in the fuel no longer cleans the said valves. Now, why do the intake valves get all dirty, is because all modern engines recirculates crankcase air (oil fumes included) through the engine to be burned, so as to minimize polluting the environment. Those oil fumes cakes on the very hot intake tracts. In theory, blown engines have more blow by oil, but this is not always true.
Only required every 50,000kms or so. You car engine lack of smoothness or lack of power will let you know when it's time to clean.
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Quote:
Originally Posted by Pseudo Nim
+1, this is part of the reason why I ditched my car too. Carbon buildup on these engines is quite awful. You pretty much have to do either that service, or SeaFoam.
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Quote:
Originally Posted by jgalaxy
This the very reason why I ditched my N54. This engine will not be a long lasting one. There isn't any defined maintenance for this, but if I was tracking my car, I would be cleaning the intake ports and valves once a year. Regular driving every 2 or three years. It's a bit of a bitch due to the some electrical components that are in the way when you try to gain access to the intake manifold. I tried and gave up, sold the car and bought a truck.
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thanks a lot ken and joel for the very useful insight.... i didnt know this was a common issue among most DI engines... i thought it was just an issue with the N54/55 engines. i guess i never faced such an issue cos my cars have always been old tech (non-DI).
glen, how would you suggest to get sea foam to clean those valves? you just pour it into the intake manifold? i dont know how that would work.