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Distilled water is preferable to tap water for use in vehicle cooling systems. The minerals and ions typically found in tap water can be corrosive to internal engine components especialy aluminium engines, and can cause a more rapid depletion of the anti-corrosion additives found in most antifreeze formulations.viperover said:Cooling system clean and flush using a 50/50 mix (no benefit in using distilled water if using a 50/50 mix)