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Not being smartalecky, but you're opening another can of worms: religion, politics, oil. Your machine was mfgr'd in the days of non-detergent oil, single viscosity, and low octane fuels; i.e. 6.5:1 compression ratio type engines. I remember when I was a kid, we had a fillingstation down the street with the pump with the glass on top whereas you hand crank gas to the top and read the amount on the graticule of the glass holder. Then you would stick the nozzle in your container, squeeze the trigger, and watch it run out. The gas in the pump was WHITE, and the octane was something like 75. 30w ND oil was the oil of the day in summer and 20w in winter (Texas). Open up the engine and you could scrape the crud (sludge) off with a putty knife. Later comes the oil filter and HD oils which keep sludge particles in suspension to be forced thru a filter for extraction. Then later yet, multiviscosity oils so you don't have to drain your oil every time the season changes. No idea what you're tractor has had done to it nor has had crammed down it's gullet. Your guess is as good as mine. Sorry, Mark
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