How to maintain a 74 240D
 

I just purchased a 1974 240D, and it only has 133K miles and pretty good shape for the what I paid. However, there are things that need to be fixed, which I'm going to get a list from my MB mechanic.

Until then, the car drives great and seems to be a good daily driver. So my questions are:
1. How can I keep it running great?
2. What are some major issues I should be watching out for?