The issue is WORKING, i.e. plowing, with one of the later high-compression 6-cylinder IH engines. In this case a 706 gas had a piston meltdown because the "93 octane" gas was actually 87 octane gasoline with 10% ethanol added to bring it up to 93 octane.
Seems not only does the gas have to be 93 octane, but it also has to be PURE gasoline, or else these high-compression gas engines will melt down when worked.
The old low-compression 4-cylinder engines like H's and M's and 300s and 450s will run on pretty much any sort of gasoline, even E85. Totally different animal.
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Today's Featured Article - Tuning Up Your Tractor: Cooling and Fuel Systems, Hoses and Belts - by Curtis Von Fange. Our tractor is coming right along. The old oil and filter has been taken to the recycler and the air filter replacement has breathed new life into our motor. Let's take a closer look, now, at the cooling system since it has to work so hard in the summer heat. Cooling systems can be real cantankerous in their old age. Radiator cores clog up with rust, lime or other mineral deposits and the fins clog up with weed seeds and debris. The metal headers slowly corrode away from years of use and
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