Well, I am sticking to my opinion that some kind of PHYSICAL aggravation is what is needed.... and whatever so called ' sediments' which might BE THERE... will be offset by the chemicals in the antifreeze.......

Has anyone seen any indication that MB thought tap water might be a problem ?

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1980 240d ,

chain elongation, cam marks reference:
http://www.peachparts.com/shopforum/showthread.php?threadid=10414

http://www.peachparts.com/shopforum/diesel-discussion/305365-9-degrees-chain-stretch.html

evap fin cleaning:

http://www.peachparts.com/shopforum/showthread.php?t=156207&highlight=evaporator

A/C thread

http://www.peachparts.com/shopforum/diesel-discussion/297462-c-recommendations-mb-vehicles.html