Sorry, Bill,
But BASF only licensed the rights to manufacture antifreeze with Glysantin in it as the corrosion inhibitor to Ashland Oil, Glysantin is still a trademarked and patented product produced solely by BASF. Valvoline might now make a G O5 antifreeze, but it is not readily available to the public as such. And you cannot "buy it from your local auto parts store". Valvoline in fact, told me it wasn't available to the public.
Don't believe me, check out:
http://www.valvoline.com
Show me where they ever mention G 05 on their website, or where you can buy Zerex, G 05 antifreeze, please!
The closest they come is Zerex 5/150, which is their extended life antifreeze. Regular Zerex still contains phosphate corrosion inhibitors which are bad for your Mercedes... Read the label on the product for yourself.
To be sure
I would only recommend Mercedes Benz coolant under the part number I already posted here, available from Fast lane, or your local Mercedes dealer.
Rule of thumb: IF IT"S GREEN, DON"T USE IT!!!!