Critical particle sizes in engine oil?

I am trying to find some information on what particle sizes are the most critical for a large diesel engine. On the net I only find "our filter removes" -information, and no real research related datas. I seem to remember that particles over 5 microns and up are the most aggresive ones due to clearences in the engine design, and that particles under 5 micron are neglible. Is there anyone out there with some facts? -Not just selling-points.

Or other comments?
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