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That's the page that pops up...I'll read it again, skimmed through it, missed something I guess unless Fram is the best filter made nowadays lol. ...There's 3 efficiency claims for the WIX or guesses rather. There must be more to it..something to do later.
The biggest reason to run a WIX is their QC is outstanding. Consistency is what I want. I want the same filter every time I get one. I can no longer trust that with Motorcraft. The Wix Pro-Tec/Microgard is 99% efficient at 25 microns. The WIX XP is designed to run strictly with full synthetic oil, and I don't know if that plays into its different media? I am satisfied with the regular WIX media. The MC filters were rated at 94% at 20 microns, as found on BITOG.