When you talk about taxis i remember very well the MB 180D and the next model 190D back home.
The 180D have a stronger body than the new shape 190D but both engines were indestructible.
Another great diesel engine was in the Peugeot 403 but the body was not as good as the one in the MB.The later 404 have a better body.

Now back to the MB, how hard is to get parts including body parts for the early 1990's models?
Some time is the rubber seals in doors and other parts of the body that need replacement and in some cars are hard to get.

Thank you all for the information.