Well, I "believe" those results are what they are. The question >>>are they valid? Just because they aren't "blessed" with ISO, doesn't invalidate them. Now, as to the wording Fram provides....for me it's a RED HERRING, since the filter media of the other "OR" filters alluded to are of the same or inferior (blended) media. Is Fram cutting corners here? Probably, but it's a non issue for those like myself who try to think PRAGMATICALLY.Not a real ISO efficiency test, but a garage test. It's been discussed many times. If you believe those test results, then the Endurace came out as the winner between those four filters.

Last edited: