GarJE, Im guessing you mean the valves. Does the inlet manifold need to come off, can you give me a brief step by step as never done it before. Started reading something about water/meth injection and how it helps with buildup but need to do some research.
As Bez said, some use oil some dont, effects even the newer models (A5, Q5 etc), Audi UK dont seem to think theres an issue even though there are recalls in the US.
Our cars never been driven hard either, guess its the luck of the draw. And mines done almost 100k, so theres probably a lot of carbon build up.