I've had great luck with VAG. I bought my previous '04 Passat TDI in '06 with 32k miles. Performed regular maintenance with the exception of a poorly designed balance shaft module that cost me $3k. It spun a transmission pump bushing at 322k miles last September. I decided to let it go and picked up a new '12 Passat TDI. It will turn 20k next week and so far, so good.