I have been meaning to post this for a while now but haven?t had the time.
I needed to perform a fluid service on our DP and had been gathering the parts for a while. I changed out the engine oil and filter, both the primary and secondary fuel filters, coolant (DCA) filter and re-built the air dryer that is responsible for cleaning and drying the air supply for the air-brakes and air-bag suspension. I also added a Fumoto #F104 drain valve in place of the factory oil pan drain plug to aid in future oil maintenance.
http://www.fumotousa.com/
I used Baldwin or Wix filters instead of Fleetguard as they are at least equal if not superior in quality?and a bit cheaper. I have posted this info. somewhere else?but can?t remember at the moment so here it is again.