Stick with the Benz approved stuff. It's what Papa AMG wants you to use.
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Based on the MSDS, Evans' doesn't appear to be magical in its chemistry...
MSDS component information for NPG+
COMPONENT INFORMATION: ( U.S.A. and Foreign Patents Pending )
00107-21-1 Ethylene Glycol (66 – 70%) **
00057-55-6 Propylene Glycol
7732-15-5 Water
- - - - - - Proprietary Corrosion Inhibitor Package <2%
(I found the MSDS at this link -->
Evans Npg Coolant - RX8Club.com )
The MSDS no longer is easy to find on Evans' page.