I purchased a 2013 Audi A4 Avant in august last year with 173000 miles on the clock. It is beautiful and drives faultlessly. It’s on it’s original clutch and has just had its second cam belt, waterpump pump changed along with bottom crank pulley, thermostat and auxiliary belt in October last year.
My take on it, buy it, look after it and enjoy it. Any car can need turbo, dpf and injectors fixing or indeed any other parts. Maybe I’ve been lucky but so far I’m really happy with my car.