? 9-5 last model, purchase advice

Hello, I had thought vaguely about getting one of the last 9-5 of 2011 or 2012. Generally asked: what should you pay attention to, which engines are recommended? I find the BioPower variant particularly interesting. Although it does not use anything in D (unless you refuel spirit or chimney ethanol), but with more frequent trips to France (or even to Sweden) then. Unfortunately, the models are only offered to – it seems to me – outrageously high prices. Despite about 7 years still mostly around 25,000 € at less than 100,000 km. The diesel is much cheaper. So what would be a recommendation here? Thank you.