Cleaner is not always better, if you have engine mods that require good oil supply and you go too far on the screening you may be restricting flow. All filters have a micron rating for screening particles. I use standard micron rated filters and change the oil and filter every 5000km and with 123000 on the clock its still as clean as a new cars oil. (and I only use synthetic)
There are lots of different theories and opinions will always vary.
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