Are you changing your oil too many times ?

I would agree on the newer engines 5,000mi is OK. I would never do that on our old carbureted engines though!
As far as quick lube places, they use inferior oil filters and I would not go for long oil changes either if it was one of my engines, not that I ever use them!!!

I do however take my Cummins pick-up out to 7,500mi each oil change and use only Premiun Blue oil in it.