If you are looking at the 4 cylinder Diesel engines I would be looking for something would a build date after September 2014 that has the newer B47 engine. Timing chains are still know. To fail up to that point, in saying that there's no guarantee that the newer engines will not exhibit the same problems in the fullness of time.

Have a look at the sticky thread on here for buying a new car. There's some free checks you can do and I would go as far as to say do one of the paid checks as well.