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.12 micron wouldn't be caught by a .5 micron filter, in this case (obviously). The question is, if factory filters are usually 10-20 micron, what contaminants are they letting in that wouldn't do damage, that these .12 micron contaminants would.I admit I missed that you specified you were filtering down to 0.5 microns. Many filtration setups only go down to 10 or 5 microns.
Here's what I could find regarding abrasive particle size distribution in used diesel motor oil. Used gas oil will be different.
For reference, the thickness of a human hair is between 17 and 180 microns, depending on race/genetics/hair type.