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Dick: I tend to favor gene's idea, that is what I do. Your greatest impurity is water caused by condensation over winter with temperature changes. If your running the tractor enough that summer impurities are a concern, then you should change it twice per year. I know a livestock farmer, hay and pasture only. He had one tractor with loader he ran year around, and did regular oil changes. He also had a fleet of about 6 - H, SH and 300, used them only for haying and spreading manure. Soon as the season was over in the drive shed they went, batteries removed, nothing else. In spring he would loosen oil pan drain plug, let water drip out as it would be on bottom from sitting all winter. Put the batteries back, grease them, check points, plugs, etc., and away he went for another summer. I'm thinking he probably changed oil every 5 to 10 years. I never knew of him to rebuild an engine. Now that bunch of tractors never saw big hours either, 200 maybe 300 per year, and no heavy tillage. I know he died with money in the bank, and the guys that bought his tractors in estate sale for the most part, got good ones.
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