I change my oil every 5k. I feel bad if it hits 5100 or more between oil changes!
I do the oil at 5k maybe just a tad earlier or later depending weather or work. I used to change the fuel every 10k as on my 6.0l but the last 3 changes it has been great. so I went 12k this time and i'll try 15k next. I have the AIS severe duty intake so between 30-50k I change it depending on its weight and the restriction gauge. Everyone has their own maintenance intervals this just seemed to work with me very well. I have the Tcase/transmission service next summer and possibly rear dif. But the front dif hadn't been changed in probably 10+ yrs and it looked/smelled like the stuff right out of the new bottle I had lol.