Originally Posted by
capsicum
Coffee filters are good for about 20 microns and auto oil filters are also good for 20-30 microns.(ish, tests and rating types and efficiency vary) large truck bypass oil filters are about one micron.(they are secondary to the main oil filter and only handle about 5% of the oil flow)
Interesting, thanks. The truck bypass filters seem to be a bit $$. Wondering about DIY solutions like filtering thru activated charcoal or whatnot? But that would probably be more of PITA than needed.