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I forgot to state that I am running a K/N filter(stock replacement)Would that account for the silcon? I've running a K/N since it was new. and have always used a motorcraft oil filter

EQUIPMENT MAKE: Ford EQUIPMENT MODEL: 5.0L 302 CI V-8 FUEL TYPE: Gasoline (Unleaded) TOTAL MILES 163,599 Miles OIL USE INTERVAL: 2,761 Miles OIL TYPE & GRADE: Valvoline Max-Life 20W50 MAKE-UP OIL ADDED: 0 qts GEORGE: Nothing too unusual showed up in this sample of used oil from your Mustang...