"I guess the only way to find out if pure distilled water +WW is a bad long term idea is whether or not our water pumps fail prematurely. is a 50/50 mix of antifreeze and distrilled water with a bottle of Water Wetter, IMHO. In normal street usage, no matter where you live, the best compromise for cooling, anti-corrosion, boiling point, etc. The main thing is does is increase the boiling point and heat exchange capacity. The Water Wetter there gives some anti-corrosion protection, but racers burn their pistons up long before the engine will corrode. Remember, in some applications, like in race vehicles, the use of antifreeze is frowned upon (don't want someone dumping antifreeze on the track - water is okay). Water Wetter substantially reduces the surface tension of the water and causes it to adhere better to the metal surfaces while flowing through the passages, thereby increasing the heat transfer capabilities both in the engine to absorb more heat and in the radiator to release more heat. Surface tension causes the water mix to lose contact with the metal of the engine and the metal of the radiator, reducing heat transfer.
So why add the Water Wetter? Basically, because of surface tension in the water/antifreeze mix. Plus, with an aluminum block engine, you want the anti-corrosion chemicals to protect the surface of the aluminum. So, what's the trade-off? A 50/50 mix of antifreeze and water gives the best possible alternative for cooling efficiency and boiling point. Antifreeze has a much higher boiling point, but is not as effective when it comes to cooling. The problem with water is the boiling point - 212 deg. When it comes to heat transfer, water is far more effective than antifreeze.
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