mike miller wrote:
>
> David B. and list,
>
> I inadvertently put some green antifreeze, Sierra brand, in my van when I
> had filled it last time with orange, Havoline.  My friend who is a chemical
> engineer, but not one that specializes in this kind of stuff, doesn't think
> that mixing ethylene glycol and propylene glycol will hurt any thing.
>
> You know anything about this kind of stuff?
>
> Mike

I would not expect any problem except that there may be no way to test
it accurately for the amount of freeze protection.  If you always add
50-50 mix, that is probably not relevant.

Larry A.