Champ PH500XL Efficiency

[ZeeOSix]

That sounds like Fram doesn't ISO test all of their filters either.. That's my point.

I doubt they do too. But like said all along, testing the efficiency on 3 different sizes to represent the size range is better that testing the most gigantic filter size in the line-up and referencing just that one giant sized filter.

 

[MuzzleFlash40]

I don’t know if the media is different or not but just recently Autozone put the efficiency rating for their STP XL filters on their website. These will for sure be my go to for my Ram and Her Jeep.