I just cut open a Fram Ultra that came off a 7500 mi. OC. Best quality filter out of any I've had apart, by a long shot. Media was immaculate, thick and wire backed, bypass had some extra parts I've never seen on other filters-- a plastic thing that appeared to make it open up more squarely. The Mobil1 is just a top-tier Champ Labs (at least they used to be) likely with a thicker can and synthetic media. I'll keep buying Fram Ultras as long as they stay around the $10 mark or below.