Well, being the old man living under a rock that I am, I made a possibly serious mistake. when I bought my Liberty last week, the coolant was low, so I added enough regular (yellow-green) Prestone antifreeze to top it off. no bog deal, until 3 minutes ago while looking at the required fluids chart posted on this site, it said a color of anti-freeze i had previously not heard of before. so how bad is this mistake? and what do i need to do to fix it. fortunately, the truck did not overheat on my 240 mile road trip yesterday going to retrieve my son from college. I guess the other question is why does it need the "newfangled" HOAT antifreeze to begin with, and what happens if i do nothing at all?