Masospaghetti wrote:

> I'm pretty much aware that mixing Orange (Dexcool) and regular green
> antifreeze is a bad idea.
>
> However, what about the new "universal" extended life formulas that
> are yellowish in color? They advertise that they can mix with any
> other antifreeze. The dude at Napa said that they won't mix. Who
> should I believe?



I found this page recently. It may help.
http://www.eetcorp.com/antifreeze/Coolants_matrix.pdf