I am running factory oil filter & AMSOil bypass filters being fed out of top of factory filter port.:-laf With 4,000 miles on the oil I changed the factory filter & small bypass mount filter (not the bypass filter) and added container of STP oil treatment and topped of with new oil. (Maybe) 1 1/2 quart of new oil. I then ran engine to have 7,500 miles on the oil. Blackstone report below. They are suggesting run oil another 10,000 miles before next report. Click here for custom AMSOil bypass install. Click here for enlarged file viewing.