Well regular media like screen is bad since once dirt gets in a space under pressure oil can then not effectively flow around that blockage decreasing usable surface area. I fiber type media has irregular surface areas so once dirt gets forced into an area oil can still flow past it effectively. The amount of media is also important since the more of it the more effective surface area you have for filtration. As the filter gets dirty the more important that becomes. Even when clean it is important though since the more surface area you have the less oil has to be forced through any given area to maintain flow. The next point is the media itself, The finer the media the smaller the particle it will allow through. At best you want 10 micron filtration since anything much larger is big enough to scratch both surfaces. Now the knowlege is not all you need. I have that but I have no way to verify media quality or surface area without ruining a filter rendering it useless. Even then I don't have the microscope to examine the media. Then we would move on to bypass valves and the material they are made from....

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