DOes it really matter who supplies MBUSA with antifreeze? If you ever want to know, just ask retail outlet (dealer) for MSDS & it will have info for your safety. Tne new anti/fr isn't the type that others are touting as enviroment/safe. That type requires complete flushing of cooling system.
Perhaps this is the type A/F that the US branch of Damiler/CH has always used.

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MERCEDES BENZ MASTER GUILD TECHNICIAN
ASE MASTER TECHNICIAN
27 YEARS DEALER M.B. Shopforeman
190E 2.3 ITS RACECAR
1986 190E 16V