Allchokedup
Autocross Champion
Probably oil control rings. I've heard the pistons were designed poorly on early models and the drain back holes get coked up with carbon and the rings then get stuck in their grooves. You can have good compression with stuck oil rings it seems. If I swap motors in the future I will likely go with a 2015-2017 Tiguan engine with the best odds of having revised pistons/rings.
Thanks! Very well could be, seems to run great.