Is there a preferred oil for the Ford V10 E-450?

Or for the OP, just change the oil when ya should.
The engine internals will outlast the rest of the rig and if they don’t, there’s a 99% chance it’s not due to the oil.
Virtually anything more than routine standard maintenance is a myth or someone with too much time on their hands. Like mixing brands and weights for the “right” concoction.