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 - Listening to Your Tractor - by Curtis Von Fange. Years ago there was a TV show about a talking car. Unless you are from another planet, physically or otherwise, I don’t think our internal combustion buddies will talk and tell us their problems. But, on the other hand, there is a secret language that our mechanical companions readily do speak. It is an interesting form of communication that involves all the senses of the listener. In this series we are going to investigate and learn the basic rudimentary skills of understanding this lingo.
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