I have an 04 Outback and though I have never changed the oil, during my initial inspection and orientation when I first bought the boat, the dealer showed me a tube that is clipped onto the back of the motor, this is connected to the bottom of the oil pan. They said all you do is un-clip the tube, put it through the drain plug hole, remove the bolt at the end of the tube and thats it, just drain the oil into a container, change the filter, put in new oil and your good to go.