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The engines or metal parts are covered with paint or plastics which act as a barrier and helps to lessen the corrosion and rust. So, we can say that coolant additive does not help to control the overheating process but also helps to keep warm the engines from freezing. Benefits of Coolant Additives
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Red Line (80204) Water Wetter is one of the best coolant additives for its cutting-edge technology. It not only ensures the efficiency of the engine but also keeps the engine cool.
Both of them can be used individually or all together. Purple Ice is a chemical product that is added to the coolant to prevent the engine from freezing up. From what I recall, the temperature drop is reduced by increasing concentration of anitfreeze. It's intended puropose is for cars running water only... if I remember correctly. I ran it with no ill effect in my 96 GS, but because I ran antifreeze in a 50/50 mix, the temp drop was predicted to be faily small. All this information is on bottle.In a warm climate the best approach is to use the minimum coolant concentration allowed by the manufacturer, whatever that may be. This will promote the most efficient heat transfer and requires no unnecessary additives. Deep galvanization in molten Zinc creates a barrier against the rust and helps the metal part from corrosion.