Thanks for your thoughts guys. I have been changing the oil first thing in the spring at the beginning of the driving season as my thought process was to have clean fresh oil in the crankcase for the trucks active season. The comments of the oil contaminants sitting in the oil all winter makes a compelling argument for the fall oil change. I was thinking more in the lines of introducing water condensation in the crankcase as the engine sits in the cold gulping up moist air during warm spells. Humidity is high most of the time here. My old precious iron sits under a pole shed, not in a fancy climate controlled garage. BTW, the truck does get started and yard driven every 2-3 weeks during the winter.
