When I had read the test results published in Consumer Reports some years ago, they noted that the Motorcraft filter is a 6,000 mile type. This means it will continue to trap harmful particles long after a competitor’s filter service life is done. This design is an indication to me that this filter could possibly be less restrictive than other brands because it demonstrates more filtering area than the average filter. Filters should only bypass when they are clogged or during extreme cold conditions. When I compare the construction of the Motorcraft with the fram, I see where the fram could bypass more easily because of the filtering element design, as well as the weaker bypass spring.
Ok I have exceeded my $.02 worth