The only oil filter that puts out numbers is Fram Ultra Synthetic its 99% @20 microns. Mobil 1 says 99% at greater than 30 microns so that is probably 99% @ 40 microns which is what most filters are.
When I saw that I removed my Mobil1 filter with a couple hundred miles and installed the Ultra.
When I saw that I removed my Mobil1 filter with a couple hundred miles and installed the Ultra.