Dear Scott98:

The conventional American Green antifreeze tends to harden a plastic radiator and make its more brittle, which in turn causes it to be more susceptible to breakage under constant vibrations transmitted from the engine block to the upper radiator and to the radiator neck.

Various pH buffer chemicals in Mercedes coolant (or Zerex G-05) help maintain a relatively neutral pH level (actually it's more alkaline, i.e ph=7-8) during its lifetime. This stable and relatively neutral pH level over the entire lifetime of Mercedes coolant is key to the long life of plastic radiators.

Eric