I've owned a German built B4 Passat TDI, a Brazilian built Mk4 Golf TDI, US built NMS Passat TDI, and my current Mk7 Mexican-built GTI.
The German car had the most problems: door handles and power windows constantly breaking, foam blender flaps in HVAC system disintegrated after 5 years, wheel center caps fell off, etc - diesel engine was bulletproof
Brazilian car: no issues, other than very slight oil weeping
US car: no issues, though oil reports showed lots of metal wear and going up at 40k so I traded it
Mexican car: only issue so far was a bad coil pack, which I place on the supplier