Optimized for the American market, the 2012 redesign brought lots of room front and rear, but it was a step backward in terms of fit and finish.
It also lost some of its crisp European driving feel, though it became less expensive.
We'd look for this generation of the Passat with at least a power driver's seat, the touchscreen infotainment system, and a backup camera.
The top-line SEL V6 offers plenty of power and plusher accommodations than lower-trim Passats.
Keep in mind though, VW's cheating on EPA emissions tests.
Be sure any used diesel you consider received the fixes and passes smog before buying it.