I'm not so sure that cooling is actually the main function of coolant any more. Sure, it's important, but corrosion control is just as, if not more, important. The cooling system on the Z seems to be marginal, so a coolant that cools better should be advantageous but I would have to be very sure that anything I used was compatible with the materials used in the engine and radiator. So far, my DD has been handling the S AR heat well (not great but good enough), so I don't plan on changing from the OEM coolant. IMNSHO, an oil cooler would do more good than better antifreeze.
If you're racing, things are probably different and any extra cooling would be worthwhile.
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