I look at it this way... filters are cheep compared to injectors and pumps. I change my oil every 3k miles and do my fuel filter every other oil change. Some folks think this is excessive but again, if the oil is the lifeblood of my CTD, I want clean blood. It only seems logical to keep the fuel system clean too. As soon as I can scrape up the cash, I will have an FS2000 system and I'll have to monitor the fuel a little closer.