Anyone know the rough efficiency of a standard cellulose filter?

[SC Maintenance]

Just curios. I know nothing is published. Maybe there is test data from some time long ago.

I know it likely also changes by the actually cellulose. For example - the old Champ XL advertised 99% at 30um or something. The old Fram orange can was from memory 99% at 25um but they claimed to be better than OEM?

Anyone care to hazard a guess?

 

[Brian123]

Anyone care to hazard a guess?

No!

 

[ZeeOSix]

Too may variables in exactly how the media is designed (how tight the pores are and thick the media is) and even total surface area can play a role in efficiency. If I had to guess, I'd say most 100% cellulose oil fitters would be in the 99% at 30-35u range. A 100% cellulose filter is typically going to be a cheap filter, so efficiency may not be high on the achievement list.