Re: Not antifreeze.
No, you need the add pack that comes with "antifreeze" it does more then just keep it cool.
There are several products out there that help with that, Redline Water Wetter is what I have used in the past.
Essentially it is a surfactant (not technically correct but close enough for this discussion) that allows the water (or EG for that matter) to better contact the metal of the radiator, therby improving heat transferr. For high performance engines that are borderline hot all the time (high performance offroad motorcycles in my case) it was a beneficial product.
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