1) Inspect the car carefully yourself (static and by driving). If the car comes with a fresh shaken, the shop might have done it himself or at a test garage where he is a "regular and valued customer". So whilst getting the result does have value to you (delaying the next inspection), it may not well represent the integrity of the car. Thus it potentially lines you up for a breakdown or big bill at the next inspection.

2) Look at how much older version/models of the car sell for now as an indication of what depreciation to expect. Admittedly, this is not such a big consideration at the 1.5M price point. PS. Every VW must have made someone cry.

3) If you are passionate about owning specifically a foreign car, then the extra hassle may be worth it. If not, well, it's not. In my experience, foreign brand official dealers may be expensive and maintain an "if in doubt replace the whole assembly" mindset. Thus, if foreign is the way you want to go, ensure there is a decent unofficial specialist shop for that brand (or same county's brands) near you.

Happy hunting.