Yep: additive into the rad fluid. Water Wetter is a substance that lowers the surface tension of water (a "surfactant"), which in turn improves the thermal interface between the coolant and the cooling jackets.
that stuff is a load of crap.
you dont need to poor any more shit
in your radiator. my dad owns a radiator shop
and ive bin around that shit all my life.
its not very good for the radiator.
if you want to run cooler, aluminum is the way
to go. poring additives is just a waist of money,
if you want to do something, do it right.
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