Just for fun I sent the following E-mail to all the antifreeze manufacturers that were listed in the prior posts:

There is a lengthy thread going on the web page http://www.peachparts.com concerning the use of various brands of antifreeze in Mercedes Benz automobiles. Many people are questioning the safety of various brands of antifreeze in Mercedes Benz automobiles. Can you either post in this group or send me a reply that I can post concerning the above question?
Thanks,

Let's see if any of them come onboard here. If I get anything back, I'll post it here.