2.0L Passat TDI Wagon or Audi A4/A6 AVANT 3.0 TDI? Don't think they have a ton of issues.
My friend's father has a diesel Passat with 200,000+km, it's had no issues and he loves the fuel economy.
I wonder if the savings of a super economical diesel euro will offset the more expensive maintenance of a Euro compared to a petrol Japanese equivalent.
Examples:
NZ New 2015 Passat TDI Wagon (80,000km)
https://www.trademe.co.nz/a/motors/cars/volkswagen/passat/listing/3765391258
NZ New 2012 Audi A6 Avant TDI (120,000km)
https://www.trademe.co.nz/a/motors/cars/audi/a6/listing/3768398160
--EDIT--
Another one I've just thought of, and I think they look rather swanky is a newer Mazda 6 diesel wagon.
Example:
NZ New 2018 Mazda 6 Wagon Diesel (60,000km)
https://www.trademe.co.nz/a/motors/cars/mazda/6/listing/3729051182
I think they look really smart.
Haven't looked into long term reliability, from memory older CX5s suffered from turbo issues, not sure if that was in diesel or petrol engines though but would be worth looking into.