If you go
HERE and enter the filter # it will cross the # over to several dozen more manufactures and maybe you can find the micron rating from their website. [img]/ubbthreads/images/graemlins/shrug.gif[/img]
FWIW I have several Donaldson P551000 and Fleetguard FS1000 (same exact filters) that are OEM on Cummins M11 engines and they are rated at 98.7%@10 micron 96%@8 micron and 83%@5 microns.I would suspect that the ratings would be very close for the P555823/cat
