Second-hand purchase question

Hello, Edt: Yes – I have read the articles on this topic 😉 in order to make the work path cheaper I think about buying a cheap (!) smart when next year comes the change sign. It should be a diesel in any case, because I have a simple work path of 55km. It does not matter at all on power and speed, is anyway all rural road, but kilometers it should be able to eat. In various Internet car exchanges you can now find Dieselmarts from 2000Euro, which then also have 230,000 and more kilometers. Is it worth a purchase if you drive around 30,000KM a year? What follow-up costs and repairs do you have to reckon with then? What can you do on the smart itself, and for what do you absolutely have to do in a workshop? What weak points does the smart, which should be looked at particularly accurately? Thank you Mathias