Need your help trying to figure this out.
I have 2005 F150 5.4l 3V. Have changed oil, filter, Cam Phasers, Tensioners and truck purrs when started and idling. When driving Oil pressure drops and truck rattles like nobodys business. Stop and restart and everything is fine go about 2 or 3 miles does it again. Hit a bump or stop at a stop sign oil pressure drops and truck rattles. Kill it and restart everything is fine. Also there is no metal in oil pan and oil and filter are good. Only use motorcraft and the synthetic oil. Sludge isn't the problem. Any suggestions?