Some people will tell you that WW alone will prevent corrosion, while others will say that in their case antifreeze was required.
IIRC, the Al part will corrode, I've never heatrd of plating the other though. I thought basically particles of Cu dissolve in the water and end up on the Al and in doing so corrode it. There are articles out there that detail this nicely if you want more information.
Your call. You can probably get away with just WW, but on the other hand antifreeze is fairly conductive in and of it self, so adding say 15% to water will have a fairly marginal effect on perfromance.
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