I don't know what makes MB's coolant better than anyone else's, but for some reason, everyone that I have ever heard discuss this, has said that you should only use the MB coolant in MB cars. The claims are that it is best for the aluminum engine block parts and prevents cavitation in diesel engines. Since disposal has been a problem for me for many years, I always left this service to the MB dealership. I did notice a few weeks ago, that there is a name brand coolant that is the same, Valvoline Zerex GO5. What I also found interesting is that my local Carquest dealer also carried the Mercedes branded coolant on his shelf. When I asked about this, he said that they can order it from the Carquest warehouse. When mixing coolant, you should use only distilled water. The reasoning for this is that distilled water has no mineral content and that the PH is 7.0 +-.

Here is a link to some information about the MB anti freeze.

Valvoline Zerex G05 Antifreeze/Coolant Phosphate Free, Long Life Hybrid Technical Bulletin (pdf).......

last question..... Do you know how to make anti freeze????