For the record: I use RedLine 20/50 V-Twin oil. 2001 Fatboy with stock 88B power.

I don't know a damn thing about the inner working of an oil filter. I make these comments from my examination of the used filters that I cut open
with a Milwaukee Sawzall. This is offered for your amusement only, and not to suggest you believe my comments as those from a person enlightened
in oil filter manufacture. Click open each photo for detailed comments.
All photos © Charles Loy and may not be reproduced or
distributed without the expressed, written consent of the photographer.