Amsoil has the best product guide for your personal vehicle I have seen, even breaking it down to the capacities needed to properly fill the changes. This is not a thread about 5w-20 v 5w-30. After the Amsoil listing of their products to use on the bottom of the list but not highlighted to go to their products it said for all temperatures 5w-20 motor oil. Vehicle in question is 06 Durango all wheel drive, 4.7 conventional Mopar engine. Dodge may have changed specs. on 08 or 09 model years to 5w-20 but I am not sure. Gary, Pablo, can you shed some light on this. Thanks