I had the 2.0 Diesel Lineartronic for 4 years around 50,000 miles from new with no problems whatsoever. I tried a couple of other brands then moved back to a Gen 6 2.5 Petrol. I’ve had that for nearly 18 months again with no issues whatsoever. I wouldn’t describe either as a particularly exciting drive, but I have never worried about reliability or traction on or (very occasionally) off road. If I was buying used the key for me would be a full service history, good condition and I would buy from a Subaru dealer who ideally knew the car from new. Hope this helps. Whereabouts are you looking (which dealer) if you don’t mind me asking?