![]() ![]() My cooling fan does not come on nearly as much as it used to. (I welcome contrasting points of view from responsible individuals. I can definitely say that the machine runs cooler. So, pink or purple, whichever color you like, but really only if you don't run antifreeze. That explains why anti-freeze actually increases the cooling capacity of water in addition to keeping it from freezing. The tests when added to water with anti-freeze in it showed very little reduction in temperature since it's pretty much like adding more anti-freeze to anti-freeze. ![]() The independent tests I read showed the most temperature reduction when added to plain water in engines that don't run any antifreeze. It looks like Purple Ice and Water Wetter are essentially the same glycol that's in anti-freeze, just in a more concentrated form. here is one example As part of its testing, Royal Purple performed dyno runs checking engine temperatures to see how different mixtures of coolant performed. Other than that, you pick the color you like best, Purple or Hot Pink and put it in, if you want to put anything in at all in addition to anti-freeze. According to a couple of test, water wetter and purple ice both work better with water than a 50/50 mix of water and coolant. Purple Ice seems to be generally more expensive. If a simple bottle of waterwetter/engine ice/Motul MoCOOL/whatever caused problems, the engine would never warmup in winter. The effect of air temps from summer to winter is far greater then any coolant you could invent. Now that I have, it looks like, to me, that the main difference between the two is nothing more than the color, and, in some cases, the price. I was under the impression the thermostat was responsible for preventing overcooling. I should have done my research before I asked the question. ![]()
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