Recommended purchase Subaru Forester SH 2.0D

Hello dear Subaru specialists, as a long-time member of the golf club I am now looking for a combination with four-wheeler. In my research for possible types and models I quickly hit the Forester. Even if it is actually rather an SUV, it would meet my requirements. The following basic data precede me: Year of construction ca from 2011, mileage up to 60,000 km, AHK desirable, but I would also upgrade to the emergency. What I have read so far seems to be very good for the car. However, the first diesel engines are reported with engine damage, which should probably be fixed from a certain model year on. Therefore, my question: from which year of construction the child’s disease is switched off? What else do you have to pay attention to when buying a used SH 2.0D? How does it come that the vehicles manchaml with combi bruach 5.9L and CO2 emission of 155g/KM and sometimes with 6.4L and 170g/Km? Questions about questions, I hope that can be helped here. Thank you. and greeting Dirk