I change it when the oil is burn-your-hand hot. All of the contaminates are still being suspended in the oil instead of lying on the bottom of the pan. Thanks to the depth of the female threads in the oil pan, your son does realize that about a half inch of oil never drains out of the pan, doesn't he? Anyway, I guess it doesn't really matter too much, as long as the oil gets drained. Years ago, I bought a '78 Mercury Zephyr (Ford Fairmont clone) with the factory 302. I knew the engine had been neglected, but I bought the car because it had a 302 in it. Anyway, I had to change the intake manifold on it and when I pulled it off, there was so much crude in the lifter valley that I couldn't see the push rods, lifters or anything else except the crud. I suspect the oil had gone 25K miles on cheap, store-branded bulk oil. There was no resurrecting that engine.
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Today's Featured Article - The Ferguson System Principal An implement cutting through the soil at a certain depth say eight inches requires a certain force or draft to pull it. Obviously that draft will increase if the implement runs deeper than eight inches, and decrease if it runs shallower. Why not use that draft fact to control the depth of work automatically? The draft forces are
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