Antifreeze (any brand, including the Mercedes stuff) will not make your car run any cooler. What it does is raise the boiling point of the coolant in your car. This allows us to operate our cars at higher temp. without fear of them boiling over. Using a 15lb pressure cap, a 50/50 mixture of antifreeze and water raises the boiling point to 265 degrees F. It also lowers the freezing point to -34F. That is the main reason we use antifreeze. To keep our engines from freezing.
As for which brand of antifreeze you use, I care not. I'll stick with Prestone. Have for 50 years. You can have your Mercedes antifreeze, and keep on replacing you plastic padiators.
Bill Lewallen; Lexington,Ky. Home of Jif Peanut Butter...