Ejdesgaard

Hi, I'm interested in buying a 2. hand legacy from between 2008 and 2010, preferably the 2.0D and if I can't find that, a 2.5i. My question is, what do I need to pay extra attention to, on those models? I have been told that some of the 4. and 5. gen engines have had some problems, but I have no idea if theres anything to it.