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Old 03-28-2010, 03:11 AM   #10
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Join Date: Oct 2008
Location: Los Angeles, CA
Posts: 3,052
My Ride: 05 330i ZHP/MT
You meant deionized water, not ionized.
You want low ion concentration in this water - ideally only the water's own H3O+ and OH- ions. Some contaminating metals, carbonate, organic ions etc. will negatively affect the engine's aluminum alloy and/or precipitate with coolant's buffer or preservative.
This is why the engine grade water is either purified by distillation or depleted by passing through ion exchangers.

Last edited by Megalocnus; 03-28-2010 at 03:58 AM.
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