Looking at the zerex site it looks like they made the coolant for mercedes see link.

http://www.valvoline.com/pages/products/product_detail.asp?product=10

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89 Ford F3504x4CC 7.3 IDI turboed Intercooler and running on wvo now powered by a 1997 Cumins
87 300SDL on bio and wvo killed by chevy truck 5-24-06
1999 E300TD black with gray int.