To add to the confusion of aluminum radiators I picked up some Royal Purple Purple Ice, Radiator Super-Coolant Additive. It's supposed to reduce radiator temperatures, condition water pump seals, and unsurpassed performance... Not sure what the third one has to do with anything. It comes in a 16oz bottle and is see-through purple. But here's the confusing part; on the back of the bottle it reads:
Quote:
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Be sure your cooling system is working properly. Radiator must be free of blockage and corrosion. Antifreeze should be fresh, properly mixed and filled to manufacturer's specifications. Using less than 50? antifreeze will further reduce engine temperatures. A minimum of 20% antifreeze should be used in street applications. Flush your system prior to use if another brand of coolant additive has been used. Do not use distilled water in an aluminum radiator.
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Did I read that right? If you don't use distilled water on an aluminum radiator, what are you supposed to use? I'm confused... Think it's a typo?