Originally Posted by gzfocus
Ford designed and built the engine to run on Motorcraft 5w30 with a motorcraft filter. The people who warranty and know more about the engine than anybody should know best...The Variable Cam Timing Actuators are very susceptible to damage with anything than what is recommended. The VCT's have failed over and over in the 04-up F-150 5.4L with wrong oil and filter. Stay away from anything that says Penzoil on the bottle or Fram oil Filters for that matter.
Are you suggesting there's never anything better than stock parts, oils and fluids?