I'd think that oil filter with 100K miles on it is eighter in full bypass or the media is ripped open. If you're going to run the oil for 100K miles, the oil filter should be changed out at least every so often.Well I made a 9 year real world study (still going on).
I haven't changed the oil and filter on my 2002 Explorer (daily driver) for over 100000 miles now.