Don Allen wrote:
> Ed,
>
> The use of distilled or de-mineralized water all started with my SAAB
> dealer over 30 years ago. He was a firm believer in using distilled
> water. He stated it minimizes electrolysis with all of the aluminum
> pieces and parts in an engine.

He's absolutely right. All well/municipal/filtered/spring water contains
minerals, none of which are beneficial to the cooling system in a car.
Premixed antifreeze uses distilled or demineralized water for dilution,
which should tell us something.