Question about filtration - particularly sandpaper grit

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I was checking the followers of a friends car and notice that the where the cam cover mates, there was an uneven nick. So I sanded it down a little with some sandpaper that was medium-fine. Some of that dust from the sandpaper went into the cam area, so I sprayed it off with oil afterwards, to flush it to the Oil Pan. He had to go to work shortly after, so we couldnt' do an oil change as we didnt have the oil. Question is, does this sandpaper grit get caught by the oil filter or does he really need to change his oil ASAP? I figured it doesnt matter, but now that its the weekend, he has time to change it.
 
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[Eek!] Last thing I would want in a motor is sandpaper grit. Unfiltered oil goes into the oil pump 1st before it gets to the filter.
 
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All it takes is one large-enough particle to get embedded in a cam rod or other bearing and that sucker will overheat and peel like on overly ripe tomato.
 

Kestas

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The grit conversion chart is at work, so I'll have to work from memory. Assuming the oil filter captures everything above 19 microns, this corresponds to roughly 400 Grit sandpaper.
 
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