Maxlife is what my neighbor runs in his 2 Jeeps, both 4.0 motors. 10-30 at anywhere from a 4,000 to 8,500 mile interval, but never much more than 12-13 months at a time. No oil related issues at all, and things look clean enough from the fill hole viewing spot.
He did a head gasket job on the 2000 Cherokee a couple years ago... think it had about 120k on it. All moving parts were fine and clean, but there a few spots of black gunk/sludge in low flow nooks and crannies. Nothing that would worry me. He usually used the OCOD or whatever filter was on sale at the time.