I used Quick Serve Online for parts and service information on my last Cummins ISB engine. I registered my XD engine to my account tonight and learned a lot about it. This ISV was built April 7, so its a very recent build. If you give them your vin # and engine serial number, they tailor a parts catalog and all the available service information for you the owner, free of charge. It is nice reference information, and the online diagrams are very useful if you ever need to see an exploded view for injector replacement, timing gears, fuel pump replacement (hint: they stuck with Bosch; hope its more reliable than the VP44's), and a litany of other stuff. Cummins does a nice job with the online manuals.