Thousands of gas tractors have run millions of hours without issue on 87 octane. The owner’s manual was written before R&M were standard pump ratings. Just as your manual says to use 30 weight in summer and 20 weight in the winter - it was before 10W30 or 15W40 was available - and on older tractors it says to use 30 weight nondetergent - because 30 weight detergentated oil was not available at a price that farmers could afford.
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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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