What type of oil to use for 2004 F-250 5.4 liter?

Oh, dude, for your 2004 F-250 5.4 liter, you'll want to use 5W-20 oil. But like, who even cares, right? Just dump some oil in there and hope for the best. Kidding! Don't do that. Always follow the manufacturer's recommendations for oil type and viscosity to keep your truck running smoothly.