3-4K on an oil change is throwing good oil away with these truck and money!7.3l And 6.0l I recommend 3-4,000 on oil changes for longer injector life. no more than 50k on trans. or don't do it 12,-15,000 on fuel filters and run motorcraft filters in fords for best results. Ford cap on 6.0 and 6.4 oil filters it can be reused but only if it is a ford cap ec-781 6.0l
5-7 K. Don't just throw oil away for the heck of it, it's 13 qt not 5.
No matter how you drive that truck your not going to beat that oil down in 3-4 k plus you have the filters, the environment, and the time involved. Go by the book.