Well I figured I'd metion the cummins centinial system with 300,000 mile oil changes it would pump non filtered motor oil into the fule tanks and I think you had to top off the oil not sure about that part but my point is cummins seems to know alot about diesel engines and would burn it unfiltered and obviously mixed with a lot of diesel. I still filter my used oil when I put it in the tank but need to find a better way. any one know where I could get a 1 or 2 micron inline fule filter?