Wow..an 06 with 24k! Any chance it's a dually? If so, you wanna sell it
As of 07, the new API spec for diesel oil was changed to CJ-4 to meet emission requirements. These are pretty much the only diesel oils you'll find on the shelf althought there are still some old CI-4+ oils out there, including AMSOIL. The newer CJ-4 is backward compatible so it will work in any diesel engine, but many people with the 06 (I should say 5.9L engines)and older like to run the older stuff. They like the higher zinc content for wear protection although the newer is supposed to be just as good if not better??
I'm still running the older, product code AME, 15W-40 in mine. I also run our EaO80 oil filter. It fits all the 5.9 and 6.7L engines. The newer oil comes in both a 5W-40 and a 15W-40.
All of these oils can run 3x the OEM change interval in the 06 and older(no DPF)...if you choose to.
They just came out with an OE diesel oil (15W-40). This is a tamed down package. It runs a little less and is only meant for OEM drain intervals. I've not sold any yet. It would work for those who still want some of the benefits but don't plan on going long intervals with it. Not sure the price is still worth it??
As for fuel, I like putting in additives all the time. Many don't do this. I use our diesel concentrate to keep things clean and lubricated. I also use a bit of cetane boost because fuels can vary quite a bit in cetane content from station to station. If you buy all your fuel at the same place and they know their cetane level is 50 or better, then you don't have to worry about it. It's also not that critical either. Cetane just lowers the cumbustion threshold and make it easier to burn. You get more efficient combustions and maybe some fuel ecomony??