this is my 2 cents, no matter how many pleats or raps are inside a filter, it is still the same micron, seems like to me the more raps or pleats you have in an oil filter, the more it will bypass due to restriction, to some who dont know a filter becomes clogged over time and there is a bypass valve in the lubicating system to always supply oil to your engine, when the filter is being clogged or when there is a restriction in the filter, sometime mybe this happens when oil is at a lower temp. or especialy when your filter has more hours on it than it should. i myself like to use oem type filters, just here lately fram has been taking a beating.