I recently installed an oil by-pass filter made by FILTRATION SOLUTIONS. I have about 500 miles on the oil and all I can say is WOW! Does it keep the oil clean. When I checked the oil this morning I used a white paper towel to wipe the dip stick off and it left no color at all on the towel,it was like the oil that just came out of the container,it had absolutely not hint of any color but its natural light yellow color. I am running Shell Rotella 15w40. Their website is www.fs2500.com