Purchase decision

Hello, I need your help and your experience! Probably you have answered this very often but I rely on your understanding. I have a budget of max. 6500 EUR and would like to buy a MINI Cooper S! He should not have run over 130,000 km since I have about 100 km of work every day. So now my question! Is there always problems with the engine or gearbox? Or can you also find good copies? Please write m I have to pay attention to what!!!! Thank you very much