I know this is an old thread but I was just browsing through all the threads I can to kill some time here and thought I'd comment and repeat what the dealer told me when I bought my 2009.
When I bought my 2009 Nitro I inquired with the service manger about a break in period and about the 1st oil change asking if I need to change the oil at 500 miles for the 1st change like some other manufacturers or builders recommend in the previous years, meaning in the 90's and early 2000's. His response was the 500 mile 1st oil change is a thing of the past and is no longer required or recommended, as far as the driving different speeds, you still need to do this for a recommended 3,000-5,000 miles to ensure it is done right.
3,000 to 5,000 miles may be a bit of an overkill in my own personal opinion but hey, that is what the service manager told me here at the dealer where I bought my Nitro. As for what the vehicle manual says, I don't know cause I am one of those people that haven't read it. How hard can it be do know how the power door/windows work, the switch for the 4WD and the radio? I know how to check my oil and top off fluids and know what oil to use and the obvious knowledge that is the same recommendation for every other vehicle regarding tire rotate and balance, fluid changes and service. It isn't rocket science to me and I feel I don't need to read or browse through a book to tell me what I already know, it's kinda like having a wife or girlfriend constantly nagging you and since I have the option to deal with that regarding the book, I choose not to and just hear the nagging from the girlfriend!
