Originally Posted by Floridaman
The o ring thing is only an issue for the RAM. They have a drain back feature in their oil filter housing that the Jeep Ecodiesels don't have.
No, and no actually
Our EcoDiesels have the drainback valve. The top plastic housing pushes against a piece of plastic and a spring. With the oil filter removed, you can feel it with your finger. So long as your oil filter is clipped into the cap, and the cap is torqued down properly, the placement of the o-ring doesn't change the plumbing, and the drainback valve will function.
I just posted some pictures of my STP filter over here: STP Oil Filter Photos, Q&A