This car has several problems that can exist and there are a lot of milage related problems( ac hoses and compressor) that may exist..make sure the owner has done milage services and that the service records do not show that problems exist that nothing has been done about.
I have a 1983 300CD that I will be selling after finding a replacement vehicle. I am currently looking at a 300CE to buy my car has 128k miles and has been well maintained if you are not able to purchase the one you are looking at feel free to contact me.
Jeff (Moose)