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Have to watch media because if the media is too fine it can actually filter out the additives.I believe 10 microns is the cut off but not 100% on that anymore. (the mind fails with age )


Harley says their filter filters down to 5 microns, but we know its not true the media may be that fine but the bypass opens at 10 psi so it really filters nothing.
amsoil says 20 microns, But I agree with Ian 10 is the finest you would ever want to use. A red blood cell is 7 microns in diameter and 3 microns thick.
I think allowing a paricle twice the size of a red blood cell get through is fine by me. As long as all the oil gets filtered not circulated through a bypass or filter design flaw.

I have no faith in human perfectability. I think that human exertion will have no appreciable effect upon humanity. Man is now only more active - not more happy - nor more wise, than he was 6000 years ago. Edgar Allan Poe