The '03 Liberty manual says that you should not use Propylene Glyco based coolants. I've been using Propylene Glycol based in my other vehicles for some time without any apparent ill effects. I prefer using this type, since it is supposed to be less toxic to pets and other animals (yes I know that NO coolant is good for the environment, but accidents can happen).
Does anybody know why Chrysler says to use ONLY Ethylene Glycol based coolant?