What to pay attention to when buying a used S80?

Hello, since I will soon have a new car and among other things a S80 is for discussion I would like to know if there are typical weak points in the car that should be paid attention to when buying it? On equipment the car should be relatively complete (automatik, Navi, Leder, Telefon, Parksystem, Xenon…). I currently have an offer for a 2.0T from 2003 with 15 000 km. At how much KM are approx. new brake discs, track rods or whatever? The car will move mainly in the city maybe 80 KM highway a week. What costs e.g. a new automatic, brake discs or track rods? What of the unnecessary toy is quickly broken (with my Audi spins zb the volume control of the radio costs just 700 euros to exchange)? Unfortunately I am very pre-loaded by my Audi and would not want to buy a car again what after two years just next to spare parts for 4000. Had before two Alfas over 120tkm and actually don’t know such problems.