Here's another big disconnect. Purolator's website (link below) shows the Boss PBL30001 to be 99% @ 25u per ISO 4548-12. But the Spec Sheet for the same Boss PBL30001 filter shows that it's 99% >46u and 50% @ 22u. Just too many disconnects, and too much info showing the Boss isn't that efficient as the table you posted shows. What's the true info?
Also, Ascent's ISO 4548-12 test showed a Boss to be ~62% @ 20u (which would be pretty close to the 50% @ 22u in the Spec Sheet).
PurolatorBOSS® Maximum Oil Filters deliver peak performance and maximum engine protection for up to 20,000 miles.
www.purolatornow.com
View attachment 189089
View attachment 189090
Spec Sheet for Boss PBL30001.
View attachment 189091