For Oliver it was KD, which stood or Kerosene Distillate. So I would say it was basically kerosene. Every kerosene burning tractor I have seen had a small tank for gasoline, you'd start the tractor on that to warm it up. The kerosene would not burn very well in a cold engine, and was very hard to start with. Once the tractor had run for a few minutes, you would switch to the kerosene tank and go to work. Some older tractors &quot;injected&quot; water into the fuel mixture to get more power out of the kerosene.

Check out these links for more info.

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