[MeltMan]

I run pure windshield washer fluid. It gave me slightly better temps (or maybe its in my head). Most importantly though, its subzero safe and its a nerve toxin (no bacteria growth). It is also slightly thinner than water and helps for flow without sacrificing thermal conductivity.

It does nothing, however, for corrosion.

I wish there were clear winshield wiper fluid too... you're kinda stuck with blue.