Not disagreeing with it.....but clean oil & a FRESH filter are cheap insurance. Can't speak for any one else but I do not have the money laying around to buy another Duramax for my truck. Not to mention when I am changing the oil I also give everything a once over, brakes, fluids front end parts etc. I think an oil change on our Explorer costs me twelve bucks or so. And the few techs I have spoke to about my diesel suggest no more than 5k between fuel filter changes. $27 for a filter is a hell of a lot cheaper than $300 a pop for injectors....just my opinion.....