I view vendor supplied "tests" with a jaundiced eye.

Zerex G-05 labeling states that it is the same chemistry as used in "all Mercedes vehicles". This I am willing to believe at face value. If it were not true, Valvoline would have heard from the DB legal department by now, and a name brand like Valvoline would not want their good name compromised by legal action from a major OEM - doesn't make for good PR or vendor relations, so labels from well known brands that such and such meets OEM specs can usually be counted on to be true.

All OEMs have specifications that various fluids must meet. They are usually very comprehensive and include a number of industry standard tests from organizations such as ASTM, and in the case of antifreeze, specific tests that each OEM develops.

Once you pass the OEM test suite, which is usually conducted and certified by an independent test lab, you can claim your product meets the OEM spec. This is a lot different than a fluid vendor coming up with their own test and posting the results on their web site.

Duke