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Old 09-14-2009, 09:21 PM   #48
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Join Date: May 2008
Location: Dallas
Posts: 1,171
My Ride: M3
Originally Posted by alibusoul View Post
When you say distilled water and 2 bottles of water wetter, is that all you put or is this with the 50% OEM coolant?
During the summer the distilled water/water wetter mix (nothing else) is the most effective for transferring heat. "Antifreeze" or the oem BMW coolant (which is a 50/50 mix of water and antifreeze) must be added during the winter to prevent the engine coolant from freezing, which could easily crack your engine block.
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