Anything from the VW group in notoriously unreliable any mega bucks to fix.
I have several mechanic friends who tell me horror stories all the time.
But to be fair I'm not sure BMW or most of the other euro manufacturers are much better.
Down here in NZ you can buy a nice cond second hand euro for $8-10k or less, but you better have loads of disposable
Income to keep it going, parts are expensive, and with labour at $80+ dollars an hr it can turn ugly real fast.
And that gentlemen, is why I own a Mazda (and a Fiat and a Mini Cooper JCW)