Got my 30k service done on my GLI at Boardwalk VW a few months ago. The service went OK, no complaints there.
BUT, I decided to check my oil last night, and noticed it was waaaaay overfilled (about half an inch past max on the dipstick).
I've put about 4k miles on the car, so this whole time I've been driving around with all that excess oil!
I cracked the drain plug open and drained out about 1 quart of oil to get it back to just below the FULL mark on the dipstick.
I don't know where the tech got trained to do oil changes, but clearly he was pretty sloppy with mine. Oh, and the drain plug was over torqued as well. I had to use a breaker bar to loosen it
This is why I do oil changes myself.