I called a second dealer & a service manager I know - he said the 2018 Jeep 3.6 calls for 0W20. He said ALL 0W oils are full-synthetic. I'd just like to know when the 3.6L engines changed from 5W20 to 0W20? Sounds legit, but I've never heard of this change before today.

No Man With A Good Car Needs To Be Justified