Yes, that's what I had read as well. No oil additives, but fuel additives are okay, but not necessary.
Keep in mind...
Chrysler assumes that you will get good fuel from the fuel stations you use. If the fuel you get is good, then additives are not necessary. However, i know that i will not always be fortunate to get good fuel. Sometimes it will have water in it, sometimes more asphaltenes, sometimes less than 40 cetane. Just how things work.
personally - i like the idea of something like XPD. adds lubricity, is a water de-emulsifier, cetane booster and injector cleaner. I've seen a noticeable 1 - 2 mpg increase and quieter engine (less diesel clatter). Is it needed? no. but man... for <$.10/gal? not having to worry as much about a failed injector pump or trashed injectors?