I have posted this illustration before, which is from the Frantz oil filter website. It shows the relative sizes of particles which can pass through a full flow filter, and what can be filtered out using a high-density element in a bypass filter. By flowing oil at a relatively slow rate through a filter with extremely fine media, the oil can be kept cleaner than can be done when the filter media has to pass the full volume to the bearings.

http://www.frantzfilters.com/wp-content/uploads/2015/07/96-percent.jpg

I was the distributor for Frantz filters for central California for several years. Several other brands use similar filtration techniques, and anyone with more than three brain cells to rub together can understand the physics of bypass oil filtration. To get sufficient flow rate to lubricate an engine, a full flow filter MUST make compromises on the size of the particles that get trapped.
Jerry

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