Ive never understood the philosophy behind "use only distilled water" when the cooling system is comprised of iron, aluminium, ruber, and other materials. Distilled water is still going to react to these different compounds eventually.

I "flush" my cars with tap water. In fact i run tap water in them and only change to a coolant in the winter months.

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'O=00=O'
bmw 2002.
long live the legend