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For flushing plain old tap water and a tablespoon would be fine. As for filling the system one can use ready-mix regular plain old green anti-freeze. Or concentrate and distilled water, 50/50 mix. Most bottled water in the gallon at the grocery store is distilled or de-ionized and works well...

Whenever I have any oil in the cooling system, for instance a bad oil cooler, I flush the system with water and Cascade dish washing soap. Some like to use Dawn, however it produces a lot of bubbles, Cascade doesn’t. It doesn’t take much soap. Just add hot water, if you have it, with some soap...