I said same concept. 3k miles was an interval that was long done away with on new vehicles, even ones using dino oil. I'm not on my home computer, but I believe the ford manual says up to 10k miles in certain conditions. I would never go that high of course but 3k miles is overkill with synthetic oil in a good engine. Think of it this way,, replacing clean oil with clean oil does nothing to help the engine. I don't go much over 3k myself, though under or even at 3k is pointless with synthetic oil, even on my only sorta good engine (95k miles and only started using synthetic at ~83k miles).
