I photographed two filter elements under high magnification. Interestingly, one filter costs 3X the other but they don't look much different.
It would seem that judging filter performance by comparing surface areas without knowledge of the media could lead to incorrect conclusions. It’s apparent that differences do exist in filter media between, as well as within, brands.quote:
The difference betwwen the fram is not the type of media, it is the total amount.
On the box, Mobil 1 claims synthetic fiber content.quote:
Mobil 1 uses a pure synthetic media, no? No paper in it to flake off.