Not about MB diesel, but still a good brief article
 

First diesel powered plane since the early 1930's

http://www.popsci.com/popsci/bown/2004/aviation/article/0,22221,768296,00.html

I just saw something on TV about a new small plane being marketed with a diesel. The selling point is that it uses half as much fuel that costs half as much (as av-gas, I guess that stuff is pretty expensive.)

A number: a two cycle turbocharged diesel has the same power-to-weight ratio as a gas engine.