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From Wikipedia...
"Distilled or deionized water is preferable to tap water for use in automotive cooling systems. The minerals and ions typically found in tap water can be corrosive to internal engine components, and can cause a more rapid depletion of the anti-corrosion additives found in most antifreeze formulations. Distilled or deionized water is especially important in automotive hybrid system component cooling systems, mixed with hybrid system coolant, to prevent corrosion and/or electrolysis of hybrid components."
From my ROUSH Owners Guide Supplement, Cooling Systems section...
"Your ROUSH Stage 3 Mustang has two separate cooling systems - one for the engine and one for the intercooler. Both use a 50/50 mix of G05 spec automotive anti-freeze and distilled water...."
I am fairly sure that Ford requires distilled water in the cooling system too.
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“If you choose not to decide, you still have made a choice.” Freewill, Permanent Waves, Rush
'07 Roush Stage 3 Mustang
My Pictures... Here
Open track is awesome. Do it... ProAutoSports
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