SLK 200/230K typical errors?

Hello! I have a question for you! And I would like to get a SLK 200/230K! What would I have to plan there, if he is about 4-5 years old and can have up to 70,000km on it? What would be a fair price??? And what are the typical mistakes of the SLK?? I have to reckon with what reperatures/”purchases” if he ran about 60,000-70,000km? What is the difference between turbocharger and compressor? Would you be nice if you could help me! Greetings Mi ii