I'm finally past the extended warranty on my 2006 GT, and changed the oil myself. The previous mechanic "gorilla'ed" the oil pan plug on; I had to use a breaker bar to get it loose. The torque setting is 19 ft-lbs. There was no plastic or metal washer beneath the shoulder of the bolt, and I'm not experiencing any drips. I checked the FSM and it doesn't have details of the bolt.
Question: should there be a washer for the oil pan plug?