Mocool is an additive like Water Wetter. You're supposed to use 5% Mocool with either 95% pure water or any mixture up to 47.5% water/47.5% antifreeze.
Over at e90post forum, some people are recommending Mocool or Water Wetter on top of 70/30 water/antifreeze. The point of the antifreeze is that it has a higher boiling point than water.
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