Pfphipps, where does MB say not to use distilled water? MB is actually casual yet pragmatic about the water used.

This is straight from the MB CD manual (20-0100):

"Use water which is clean and not too hard. Drinking water frequently, but not always, satisfies requirements. The content of dissolved substances in the water may be of significance for the occurrence of corrosion. If the water quality is not known, distilled or fully desalinated water should be used. For water quality see Mercedes-Benz Specifications for Service Products."

Interestingly, my booklet on Factory Approved Service Products (dated 11/01) does not address water quality, so the last statement is a link to nowhere.

But I'll agree that the dealers are doing exactly what is recommended by MB.

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95 E320 Cabriolet, 169K