The great oil filter debate

The thing about running a 10 micron filter is..... How long it it in bypass when the filter median is at max flow and no more can flow thru.
All that bypassed oil is pushed into the engine UNFILTERED!!! Even using a 20 micron filter, I'd bet that 20% - 30% of the oil entering the galleries is UNFILTERED. Suck it up Buttercup.

If you want the best filtering then run a real good 20 micron main filter and add what is call a 'Bypass' filter device that takes a low volume of oil and runs it thru a 2 micron 12 inch long filter then dumps that super filtered oil back in the block.

If I had a diesel 5.9 I'd run a Bypass setup. A neighbor had a contract with GSA to transport Military members cars from Seattle to the east coast to load on ships to transport them to England or Bremerhaven Germany. He had a Ford F350 Dually diesel with a 6 car 5th wheel trailer and was doing oil changes per tests with 'Blackstone Labs'. He was getting maybe two round trips from west coast to east coasts on 1 oil change. Then he did a huge oil bypass system and went from a 12,000 oil change to only changing all oil filters twice and topping off for 50,000 miles when Blackstone said "Run it for 7,500 more miles and retest". At the 57,500 mile marker they again said "Run it for another 7,500 miles and retest". He finally settled on a 70,000 mile total oil change interval and 7,000 mile filter change. Oil was Delo 400 15W40 and all filters were FleetMaster. But each oil filter change was like 3 quarts used oil removed and fresh oil added. I think a full oil change was like 22 quarts.

And remember how an oil pump works. When the bypass piston spring is pushed back, the oil is not dumped back into the pan like a lot of people keep saying. It is bled back into the low pressure side of the pump and gets sucked back up when the spring pushs the bypass piston shut. So if your oil pump is in constant bypass it beats the hell out of the oil AND you do not get good flow......