Crap shoot for me. Do it before storage to get rid of the sulphuric acid, which is much less now with low sulphur fuels, and crud is still in suspension in the oil. Or do it in the spring before you drive it.
The fall usually wins as after you drive it awhile you burn out any accumulated condensation in the oil, the sulphur is much lower now, and the crud comes out with the oil, doesn't settle in the engine.
I had a clear plastic oil drain pan I made once for a special engine. I did an oil change and for some reason set the container, with lid, on a shelf full of black oil....detergent doing it's job. A long while (forget how long) later I come across it. The oil had cleared up to almost new looking and the bottom of the pan was full of solids. Reason enough for doing it in the fall.
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Today's Featured Article - Timing Your Magneto Ignition Tractor - by Chris Pratt. If you have done major engine work or restored your tractor, chances are you removed the magneto and spark plug wires and eventually reached the point where you had to put it all back together and make it run. On our first cosmetic restoration, not having a manual, we carefully marked the wires, taped the magneto in the position it came off, and were careful not to turn the engine over while we had these components off. We thought we could get by with this since the engine ran perfectly and would not need any internal work. After the cleanup and painting was done, we began reassembly and finally came to t
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