What I have been told is that Mercedes coolant will help to protect the radiator and lubricate the radiator hoses to prevent them from getting cracked or dry.
The color of MB coolant is a light orange color. It should appear that kind of color when you look at your coolant tank.
My mechanic said that you wouldn't destroy the radiator by having the green stuff in it, but the MB stuff is so much better.
Hope this is kinda helpful.