Originally Posted by Chris142
Originally Posted by bbhero
Originally Posted by billt460
What do other automotive air filters claim percentage wise for dirt entrapment? My guess is the same or worse. Or do they even mention it? Why would any company knowingly advertise something that they lagged behind the competition in performance claims?
Purolator 99 % per ISO 5011
Wix 99.5 % per ISO 5011
STP Premium air filter 98 % per ISO 5011 small dust test used
Fram Ultra 99 % per ISO 5011 small test dust used
So.. 90 % is terrible not matter what... And this math is super bad because it is based upon the power of 10s on a exponential form...
Even a 2 % difference is a big difference in what passes through a filter... A 9% difference is a MASSIVE/ Exponential increase in what passes through that filter...
That's why I have said the STP regular air filter should say it stops only horse flies, praying mantis, and hornets from entering your cars motor
And 100% of golf balls.
And golf balls too for the regular STP air filter