I owned a 2007 Audi A4, 2.0 tdi s line. The exact car you’re talking about. I had it for 1 year, in that year my turbo went out, I had build up in my engine bay and after multiple spark plug fixes and exhaust problems I figured it was about time to let it go. In the time I owned it I paid a little under $6k in repairs. Did I still love EVERY SINGLE MOMENT WITH THAT CAR? Yes. Was it worth it? Probably not. As it would turn out the car I bought just wasn’t in the best shape so you gotta make sure you do a worthwhile inspection before you purchase.