99 Jetta TDI with 240,000 km. Great car as far as mileage. In the summer, consistently returns 21-22 km/L on highway with no A/C, about 20 km/L (47 mpg) with AC on. Still gets about 16 km/L in the city with a heavy foot.

IMHO, it's nowhere near as comfortable as the Benz, and louder inside.

No real problems, except I cleaned out the intake, EGR and anti-shudder valve once, then used VAG-Com software to adjust EGR flow to hopefully decrease the buildup of gunk. It's worth having VAG-Com or having access to someone with it when doing work on the car such as timing belt change, etc. (You need it to set the timing correctly).

__________________
1991 MB 300D 2.5 Turbo (207000km) (now gone)
1993 Audi 100 CS Quattro (300000km)
1999 VW Jetta TDI (290000km)
2002 Audi A6 3.0 Quattro (150000km)
2005 MB E320 CDI (34000km)