First, Isn't there a plug on the block to allow complete drainage?

Second, to rekindle the antifreeze debat... The orange uses chemical that capture any calcium or magnesium in the water mixed with it. The green stuff makes small white crystals which can be seen in the radiator in stead. If these crystals accumulate it blocks the fine passageways of the MB radiators. The orange is supposed to be 100,000 mile stuff too.

One can always be safe and stay with the MB coolant.

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1991 350 SDL
183,000 miles

1982 240D
130,000 miles