My 18 GTI Dsg has 135k miles. Bought new. Been reliable. Well maintained. Battery was just replaced. Originally waterpump, no carbon cleaning. Still smooth as butter. 93oct from new. But lately sometimes 89oct. 36mpg avg. Best car I've owned.
I guess my 18 GTI is a good one. Bought new. Never abused it. Stock. Mostly highway miles. Flawless. I wonder about the carbon buildup though. Idles smooth still.