Impreza Diesel MY’09 available?

Hello together, after a long search and reading in the forum I’m unfortunately still not smarter. I’m fascinated by the boxer diesel in combination with the impreza, but unsure if I should leave my hands on the MY’09. What else than needed, MY’09, 50-90tkm is probably not in the budget; then I would have to look around for another four-wheeler. Are there serious problems/children’s diseases or only cosmetic, uU. Casual with which to live? The G3 test by Karle 1 I have read, also the comments about it. My daily work path is about 40km easy, so I do not worry about short distance. I do not know the history of the car. When did the change between open/closed filter come? I have not noticed anything so far during test drives (except a rather hot engine compartment, but am no expert on Subaru or Diesel), what should I pay attention to? Thank you for your tips or experiences. PS. I am aware that my question is not exactly new. Most threads on this topic seem to me to be a bit older. Maybe there are new/more experiences.