Just got off the phone with Fram support. Thought I'd pass along some info the guy gave me.
Extra Guard (entry level Fram): 95% efficiency @ 20 microns
Tough Guard: 99.1% efficiency @ 20 microns
Ultra: 99.67% efficiency @ 20 microns
I know the 95/99 numbers are on their site, but the site doesn't clarify the tenths of a percent.
Applying these numbers to a theoretical supply of 1000 particles--the Extra Guard traps all but 50; the Tough Guard traps all but 9; the Ultra traps all but 4.
Additionally, the dirt holding capacity of the three is:
Extra Guard 8 grams
Tough Guard 10-12 grams
Ultra 26 grams
He also stated that the Ultra would have better flow through, because it is 100% synthetic, whereas the Extra and Tough Guard are synthetic-cellulose combinations.
Extra Guard (entry level Fram): 95% efficiency @ 20 microns
Tough Guard: 99.1% efficiency @ 20 microns
Ultra: 99.67% efficiency @ 20 microns
I know the 95/99 numbers are on their site, but the site doesn't clarify the tenths of a percent.
Applying these numbers to a theoretical supply of 1000 particles--the Extra Guard traps all but 50; the Tough Guard traps all but 9; the Ultra traps all but 4.
Additionally, the dirt holding capacity of the three is:
Extra Guard 8 grams
Tough Guard 10-12 grams
Ultra 26 grams
He also stated that the Ultra would have better flow through, because it is 100% synthetic, whereas the Extra and Tough Guard are synthetic-cellulose combinations.