I purchased this truck certified used with 15K. Paperwork from dealership said they put Motorcraft 5W-20 in the truck, manual calls for 5w-30. Dealership promised it was a type-o and regardless it would not be an issue. Results confirm it was the 5w-20. Wear #'s show it didn't do any harm but do not consider this a 30wt that sheered, it was the dealers error.
Replaced the oil with Castrol Edge 5w-30, will probably go to 7500 mi and pay for the TBN next time. Was not concerned with TBN on this early change.
I tow my boat on weekends with this truck (about 3000 lb) and live in Houston. 100 Degree's is what this truck lives and breathes daily. All driving done with 87 octane and works great, no noticeable power loss with 87 octane.