search, don't be afraid search is your friend,

been address many times.
I have written on it, that type of filter is a nascar item and only belongs on a race car. Smokey used them due to a paper filter aerating the oil at constant nascar high race rpms the reason it was developed.
For R-D,
a pureone filter filters down to 12 micron avg, most others 15-20. see wixfilter site they provide micron rating of their filters.