It has beeb reported that the calcium content of water can be in the 100 - 200 mg/l range. That's just one mineral. Then you have the possible corrosive effects of chlorine as well.
I really doubt that this is an issue because I've heard of one engine being torn down after significant miles towing with WMI and it was as clean as a whistle. I'm just trying to address the naysayers that I continually run into. Would like to be armed with some good info, that's all.
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