Have you ever heard of someone using a .5 micron filter sock and dropping it in? I know they are +- .5 micron generally so I figure it would get out 9/10 of the crap If the fuel filter is only at 5 micron.Be very careful about this....even straight from your oil pan, you are going to clog the filter real quick. Oil is dirtier than you would be lead to think. Hundreds of particles (ppm) over 15 microns...and hundreds under 5 microns. Get a centrifuge....then you will have lots of particles that are 1 micron or smaller Leave the centrifuge in a 55 gal drum of oil for about 4 hours it will be realllly clean. Google spinner 2 centrifuge if your interested.