I'm no expert by any means, having only had limited experience (a couple of months, vs 17 years with the P2 type) with a 2008 version of the same car…and since no one else has put up an answer…
As I understand it, these engines can use a bit of oil, so that would be an obvious thing to watch out for. The cams are chain driven, but they are supposedly not maintenance free, not sure what the service interval is on those…
I'd definitely be checking out the PCV system to make sure that it is not blocked. The transmission requires periodic oil flushes, (so called sealed for life, but that's BS) change at least every 80 K. Whilst you are at it, change the oil in the angle gear / Haldex / differential. I use VIDA to interrogate the OBD 2 port, generic readers are probably OK, but wont give you much (or any) information on the various other systems in the car.
Our car has had the odd clunky gear change early on, and apparently not since the transmission flush. Hopefully it will stay this way, otherwise, the car may need a solenoid pack to be changed in the transmission, will cross that bridge if and when we get to it..
The car is very pleasant to drive, and my son loves it, good luck with your search, and hopefully a few other more experienced owners chip in with their advice.
