To add another dimension to this thread, the 5.4 engine is noisy by nature at start-up. It is piston slap. I had a customer come in complaining bitterly about the noise on his three month old truck. He heard it for the first time a few days earlier. He was not content until he started several new trucks in stock and heard the same noise.
Now I'm not saying that the truck in question wasn't noisier than normal or that it did not quiet down with a fresh fill. I'm only saying that piston slap is a fact of life on a Ford 5.4. It is inherent in the design. It doesn't hurt a thing.
Now I'm not saying that the truck in question wasn't noisier than normal or that it did not quiet down with a fresh fill. I'm only saying that piston slap is a fact of life on a Ford 5.4. It is inherent in the design. It doesn't hurt a thing.