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      11-07-2012, 08:16 PM   #3
GaryS
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Drives: 2009 135i 6MT
Join Date: Feb 2010
Location: Maryland

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2009 135i  [3.25]
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.