They mix fine, but if the Prestone is supposed to be five year, 50,000
mile "new technology" coolant, it won't last any longer than the regular
stuff if there is more than 10% of it in the mix.

It is best to stick with one brand since the corrosion inhibitor
additive packages are all a bit different, and there is no guarantee
that mixing brands won't reduce corrosion protection.

Sorin Bejenaru wrote:
>
> Anyone knows if it is OK to mix the green and the pink coolant?  Prestone
> makes a phosphate free coolant that is pink and I have been topping off the
> coolant tank with this kind of coolant.  Now my mechanic say that I should
> not mix them but he does not know why.  The Prestone conatiner says that
> the pink coolant is compatible with other coolants.  Anyone knows why they
> should not be mixed?
>
> Sorin

--
Stuart MacMillan
Manager, Case Program
800-909-8244 ext 208

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