Quote:
Originally Posted by hellokitty
I decided to geek around with a refractometer this weekend and messed around with different BMW coolant percentages, distilled water and Redline water wetter.
Based on my data in BM3, my coolant temperature has dropped 7-8 degrees f using the following:
20% coolant
80% distilled water
1/32 ratio of water wetter (4oz per gallon of distilled water)
I figure I’d try to make the most of the stock cooling system by making it more efficient. This DIY cost me $15 so I’m happy with the results.
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Probably the best ratio for street cars, if you flush coolant regularly.
Most track cars get best results from 100% distilled water + water wetter, at the cost of the corrosion protection you get from antifreeze/coolant.