Re: Differential service?
Unless you guys are doing some serious towing and/or offroading (diffs underwater alot) then you really don't need to change the diff fluid that early, just inspect it. As long as the diff fluid is still a golden color you are good to go. Plan on just inspecting mine every other oil change and go from there. And almost any dealer is going to push services you don't really need, it is another way to make an easy dollar off of people.