Alright you know how the Wrangler uses the HOAT Antifreeze? My dad decided to use it and mix my Hoat antifreeze with regular antifreeze in his grand cherokee... Is it going tonesd up his engine if he doesnt get it flushed??

 

Here is a link to a pretty good article on the different types of anti-freeze.

h t t p://donsnotes.com/home_garden/auto/antifreeze.html

Short answer is you should not mix different types of anti-freeze. Short term most likely OK but if it were me I would flush and replace with the correct coolant type specified by the manufacturer.