The BMW coolant cost $18 an bottle.

BTW Zerex says we are all wrong and should be using Yellow.

I think we can all agree on is that it is a good idea to replace your antifreeze on a regular basis and you must be careful with mixing types. A complete flush, including the heater core, is a requirement if your changing fluids.

If your level is dropping and you have no leaks, chances are the water in the mixure is boiling off. The most important factor for the life of you cooling system is the pH. Straight water is 7. The best range I have been able to find for all cooling systems is between 8 and 9. Topping off with Deionized water and keeping an eye on the pH is the safest way to go until the next change.

Would you agree?

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2007 Suzuki Vinson 500 4X4
2007 Toro 6.5hp
2006 BMW X5 4.4 ltr (his)
2001 BMW X5 4.4 ltr (hers)
1994 Honda XR650L
1984 Honda XR80

"Beer is proof that God loves us and wants us to be happy."
Benjamin Franklin