i was gonna say its pretty normal, but then i saw the 2.4 motor. and its outside of warranty to, 2006 got hosed on warranty, i know we bought a van then. i'd say do an engine oil flush and change the oil at 3k every time and you'll be fine.
that motor is not a tried and true jeep motor, it will not last as long as the old 4 and 6 cyl. it was started in the neon, and then bored out and twin cam'd for the mini van and jeep among a couple others.