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Originally Posted by Kestas
The MB shop manual specifies using demineralized water for coolant mix. Mind you, this is specified by Germans where the water on average is harder than what we have in North America.
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Because of their hard water in Europe, they recommend using a phosphate-free antifreeze in their cars. Honda is real picky and their Type 2 antifreeze is silcate-free, phosphate-free, borate-free and nitrate-free and comes already mixed with demineralized water. Not cheap either!