Quote:
Originally Posted by Orion4
Recommended BMW Coolant mix is 50%/50% coolant to distilled H20. The coolant is great at lubricating the pump system, preventing corrosion on the internal water-jacket and doesn't freeze, etc, BUT it's not very efficient at temperature control/transfer. That's why the water mix. Water is very efficient at transferring heat, BUT by itself, causes corrosion, rust and freezes at 32F.
The 50/50 mix will typically provide the balance between component protection and engine cooling with freeze protection down to -34F.
It's OK to add small amounts of straight antifreeze (or water) when you're in a pinch, but do not do a complete fill with straight antifreeze or water.
I always pre-mix my anti-freeze and water at 50/50 and keep in the container in the garage. That way always readily available when needed with the correct mix.
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or go to a dealer for 15 mins and no charge...............