What was found
ENGINE RUN SMOH WITH MOBIL AV-1 ENGINE OIL. ENG STARTED SHOWING HIGH READINGS OF IRON, CHROMIUM, ALUMINUN ON OIL ANALYSIS. CYLS REMOVED FOR INSP. ALL OIL CONTROL RINGS FND STUCK W/LEAD BUILD-UP & ALL CYL WALLS FND WORN UP TO .014 INCH. ENG REMOVED FROM ACFT & DISASSEMBLED. FND VERY HIGH SLUDGE BUILD-UP IN ENG CAUSING PARTIAL BLOCKAGE OF MAIN OIL GALLEY. THIS CAUSED PREMATURE MAIN & CONNECTING ROD BRNG WEAR TO NEAR FAILURE. CRANKSHAFT ALSO FND SCORED AT PROP TRANSFER COLLAR AREA. CAM FOLLOWERS FND PITTED. ENG O/H 2-1/2 YEARS EARLIER W/ALL NEW CYLS, BRNGS, & CAMSHAFT FOLLOWERS INSTALLED. SUBMITTER STATED SEEING SIMILAR DAMAGE IN OTHER ENG RUN ON THIS OIL. RECOMMEND INSP OF ENG WITH THIS OIL.