Maybe one of you guys or gals can answer this question. We just bought a 2006 Dakota SLT, and, joy of joys, the owner's manual is in the glovebox. I am considering switching over completely to AMSOIL, and ran into a roadblock. AMSOIL has a propylene glycol coolant that is better for the environment, non-toxic and all around better and safer than ethylene glycol. The Owner's manual specifically forbids the use of propylene glycol coolant. No reasoning, just do not use it. I spoke with our resident AMSOIL dealer, and he has never run into this before, and has no idea why Dodge is death on the best coolant.
I have a theory on this. IMHO, Mopar does not make a propylene glycol coolant, and they don't want to lose the income from selling the deadly, hard to dispose of ethylene glycol.

Anyone have any ideas?