I read something similar to that a while back, on a Corvette site. I never liked FRAM filters anyway. Although a Fram filter would probably be okay for 3000 miles, but why not get a better filter if doesn't cost more?
I saw a Fram, a Purolator, and a AC Delco fliter cut apart in an Auto parts store before, and have used AC and Purolator filters ever since.
I use the Purolator Pure One (PL-14670). It is the same one that came stock on my Rubi. I even cut them open to take a look. Same stampings, and inards. I do like the Wix filters though, just a pain to get them from NAPA, so I went with the next best I could find.
I buy Mobil filters from Auto Zone, they also ship if your not close to one. I did a lot of reserch on Filters to, I found that Mobile 1 and Wix were rated as the best. However, the Mobil 1 is a tad better being it uses a Synthetic media, which filters better.
I have been using the Fram Tough guard filter. I know Fram was not rated that high but the tough guard did the best of the Frams. Walmart and Autozone only carry fram for my jeep. I may try Napa or OReilly's. I would like to use Mobil 1, I use their synthetic oil in my engine but I can't seem to find it around here (Northwest TN).