In case any of you are intresred John Kennedy has come up with a filter that will keep your oil lookin like it came out of the can when it is time to change it. This guy has his own Dyno an he is always tring to make more horseepower an you can imagine what this does to the oil. His samples show that it is clean of all soot and heavy metals that can cause harm to your engine. I am going to try one as soon as he gets the complete kit together. I run his fuel filter and my fuel samples come back with excellent reports. kennedydiesel.com. he may cuss you if you say I said so.