Buy SLK 200 model R170?

Hello dear Mercedes friends, do you have some questions about buying a car? You all know each other well and I had already before 2 Mercedes 190 and 230 but SLK 200 I already something different. So on the subject: I would like to buy a SLK 200 and will visit one tomorrow : SLK 200 ,,,No compressor,, year 1998 approx. 160000 Km run with new TÜV/AU Price:VB 3800 Euro What should I pay attention to when buying , ,illnesses ?,, Can one actually a so old FZ without bad doubt so buy from private (therefore no warranty). camshaft switch is already known to me should not be oiled (plug from sensor) capillary effect oil wanders through the cable to the control unit etc. and then it becomes expensive! rust at the tailgate license plate holder ,schweller, wheel runs, door edges and bonnet is also known to me ! roof should open or close within 28 sec and wash roads be tight I also know! So now I am curious which tips you still in stock ha bt? 😉 LG Poloblackdragon