In addition to the other comments, the petcocks to check the oil level were also used to lower the oil level when a little distillate dilution raised the level too high. With gasoline, you practically never have to even open the upper petcock. Also, my dad tells me the tractors had more power and better fuel economy on distillate. So it was cheaper but not inferior. From earlier posts on this board it is apparent that different areas of the contry had differant grades of distillate. In Missouri, it was called tractor fuel and was a little heavier than kerosene (or coal oil at the time) and lighter than diesel. I have used JP-4 in kerosene lanterns, it burns clean. I'm sure it would work well in a tractor, but a Farmall needs shutters to keep the engine temperature up. For the naysayers, I confirmed with a chemist in a refinery that indeed jet fuel is only clean kerosene and not explosive since all the local experts were sure I would blow myself up using jet fuel in a lantern. The fuel was free from the water sump on the flight line. Too much moisture for a jet engine but the lanterns couldn't tell!
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