Started to hear it occasionally on start up couple years ago, rattle almost a ping. Back in May it started to get worse finally becoming a full fledged KNOCK in August. Pulled the oil pan and discovered #7 & #8 Rod Bearings Burnt and Worn from Oil Starvation (208,000km.).

$ 2500.00 Later I now have a 5.4 with 96K on it and a years warranty on Engine and Labor. Happy to discover the New 5.4 just did 21 MPG Imperial 17+MPG US on a Tank with Town Highway Driving. Now if I can keep the Rocker Panels and Pan Rails from Rusting Out. Added Bonus was when I left it at the Dealer for new Tank Straps the Tank Began to Leak, got a new Tank from Ford. Not so great is now the AC Compressor Bearing is shot......Can't wait to see what November has waiting.