My son about 10 years ago in high school did a science fair project, testing different 10-30 oils for heat breakdown, flowability at -30 degrees, and friction resistance after it had been heated (boiled) for 20 minutes and at room temperature. He used 12 or 15 different brands of oil both synthetic and regular. The Amsoil 10-30 came out on top in all tests. If I remember right, Pennzoil 10-30 was second. He took 3rd place in the state science fair in Fargo.
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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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