Oil Filter Tests by river_rat on BITOG Forums
I put the PureOnes at the best filtration both small and large sizes.
1st place: PureONE small and large
2nd place: about a tie for large Purolator Classic, large Proline, large NAPA Gold, and the small Fram TG and XGs
3rd place: small Proline (I think the large Proline has regular Purolator media, the small one may be a cheaper version - not quite as good, IMO)
4th place: Honda and Hamp about equal
It's easier to see these in person where you can roll them around in the light.
Sorry my camera focus is messed up. These are the best 2 pictures of 5 or 6 taken.