As usual I am truly amazed at the amount of knowledge and dedication to finding information on this website ( it is why always love to read stuff here!). Harley probably view this website like many people view Ralph Nader. But back to the filter issue, I guess we need to be careful if we put a K&N filter on, because if stock HD filter filters at 5 microns ( though we know it doesn't), and oil is 8 microns, if we suffer an engine failure, the MOCO will blame it on the K&N filter for actually filtering the oil for the engine!!!!!! Oops, I guess I got carried away, so I will step off soap box, but thanks to all the research gathers it never leaves any stone unturned or have dull moments. John