Hi, I've been readind threads on ZF service and am scheduling mine and an authorized ZF shop unless my Indy (nn-Jag is wiling to help me in his shop, I'll so it myself then.

Question is, does the rear Diff (and front since its AWD) Need oil change as well? Not seeing it mentioned in the Handbook. (maybe just missing it)

 

In my experience, if there's oil in it, it needs to be changed, "sealed unit" or not.