Hey folks. I'm considering purchasing a 1975 300D that has 67,000 miles on it, selling for $5,500. The owner actually gave me this site as a reference. I am just wondering if there is anything I should know about this car before purchasing? It looks like it was kept in immaculate condition. It's very clean, no rust etc. However, I have never owned or even rode in a diesel before looking into this car, so I don't really know what to look for. The more I read about these mercedes diesels, the more I want one though. Any general guidance would be hugely appreciated. Thanks!