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Originally Posted by Huney1
Bad radiator caps allow air in the system: Sure they do, but it shouldn't cause the anti freeze to jellify like DexCool does. DUH? Over the years, how many problems has Prestone caused any engine? ZERO, period, end of story and I rest my case.
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DexCool has a different chemical makeup than Prestone. DexCool is a OAT (Organic Acid Technology) containing a different set of corrosion inhibiting additives, and contain organic acid salts. It's also less alkaline than other coolants.It is also silicate free.
Prestone is an ethylene glycol based, or propylene glycol based (less toxic version). It also has a different set of corrosion inhibitors. One reason why air causes the DexCool to "jellify" is because of it's different chemical makeup. It's like comparing two prescription medicines that treat the same malady. While they may be similar in the way they appear,and treat the problem, their different "chemical makeup" which makes them unique can cause different and varying side effects, just as air affects the DexCool, but not the other brand coolants.