The chatter I get on the web is that the m/c is basically a purolator filter, the fram is made by allied signal. while the fram claims to produce a 96% single, 94%multi-pass efficiencies they are at 40 microns, while the claim the motorcraft makes is 68% efficient at 20 microns. Both are average for filters, just a different test media size. And they probably filter about exactly the same, if measured with the same media size. What I am really interested in is the mobil one oil filters. They claim a 99.7% single and a 99.2% multi-pass efficiency and use a combo fiberglass and cellulose filter membrane. If i could find one for the 6.0 I would definitely try it.(probably don't make one)