My dealer sells a lot of trucks and when I took mine in for the first oil change at 7,500 miles the service manager advised me to change the fuel filter twice as often as the manual calls for. When I went in for the 15K oil change he told me they were still finding traces of asphalt in the filters changed more often and recommended replacing the fuel filter at 10K miles. I followed his suggestion and replaced the filter at 10K. Earlier this year I noticed my in tank pump was louder than usual, I replaced the filter at that point with less than 10K on it. The pump sound was normal again so I cut the ends off that filter and found lot's of crud. My truck has only been fueled at dealer pumps its whole life but I now replace the fuel filter at every oil change and cut it open. Its amazing how much junk is in the fuel here in the U.S.A. Yesterday I had my oil changed at the dealer and told the service guy what I have been doing and that to date I have never had any issues with my ecodiesel. He said keep it up because there has been at lot of ecos in with fuel system issues. The engines in these trucks were developed in Europe where the fuel is much better quality.I purchase fuel filters in quant's of 3 and get them at a reasonable price and have been changing them my self for 2 years now.