I’ve been going to the dealer for an oil change since I’m under the gold certified warranty. I usually leave that oil in after the dealer changes it at max 2500 miles since it’s semi synthetic. I then change to a full synthetic SN or higher API rated oil like Penziol Platnium or Castrol Edge and run that for 4-5000 then back to the dealer. In the winter, if I do a lot of short trips or tow at anytime I’ll change it a little earlier. I’d rather change the oil a little early and happy to get under the truck as well to be sure all is OK than be stuck on the side of the highway with my kids and pets in the car. Diffs and transfer case fluid are also really important. Maintenance manual says 100k on transfer case and 150k on diffs but that’s nuts. More like 40-50k on transfer case (it’s so easy to do) and 60k max on diffs. I’ve used Ford fluids for them which is very good and the transfer case is Ford specific Mercon UL due to the clutch inside the unit. Coolant blew my mind. Only about a gallon and a half came out which is so little for this type set up. I’d love to go with a Mishimoto rad just for the extra size. The stock radiator is big but has no coolant volume for a 400hp vehicle. My vehicle had the orange coolant and I changed the it twice to get it all out and now using the yellow. The yellow is supposed to be better and backwards compatible per Ford.