I recently purchased my 6.4l and I am not sure about the exhaust filter cleaning. I tried to search the site to find info and either I am not very computer literate or there is not much info on the questions that I have. I have just over 1600 miles on the truck and it seems to clean the filter alot. I have counted 6 times. It goes through it cleaning process anytime I drive more than 100 miles at one time. I recently pulled my 20' boat to Lake Mead (about 900 miles, round trip) it went through the cleaning process 2 times on the way there and 2 times on the way home. How often do they ussually go through this process? Also, while it is cleaning the filter the boost guage on the dash surges. It surges anywhere from 5-10 psi boost while it is cleaning. Are either of these conditions normal? What can I do to get a more productive regeneration? It doesn't seem to affect the truck at all. In fact, pulling the boat I still got 13 miles per gallon. Not as good as the 7.3, but I'm not complaining for a brand new truck. Thanks for the info...