after reading this, I was trying to figure out when in fact I should Replace the fuel filter in my truck. I have a 2004 and only have 8,500 miles on her. I do not travel far at all to work. I have never had it replaced as of yet, am I making a big mistake? This is my first diesel. so much to learn. . I was pleased to read my injectors have a long life ahead of them providing I dont screw that up. . Any good advice would be appreciated... Thanks.