I found you guys while searching the web for "how to change a cartridge filter".
I just bought a 2007 Milan Premier 2.3 I4 5-speed manual. It was leaking oil pretty severly from th oil filter.
I bought from a dealer who took it on trade-in. I replaced the oil cartirdge just as it came off. The problem was it had a black o-ring and an orange one. I didn't see the black one not thinking that it was messed up from the previous owner. I did the same thing and it leaked worse!
I saw a pic showing where the o-ring was and saw that I had 2 gaskets.
That was the cause of my leak!
I wonder if the car was trade in because of frustrations from the previous female owner.
This is day 4 of ownership. Hopefully that will do the trick.
Thanks for being there.
Sylvain