Originally Posted by hydrashocker

But seeing how the Durango 4.7L's engine uses 5w-30 is the "Preferred Lubricant" I would run Mobil One Fully Synthetic 5w-30 year round in Canada, however down in Florida or hotter areas especially when heavy duty use is nessassary I would use Mobil One Fully Synthetic 10W-30 in the 4.7L.