Those really old tractors didn't know what lead was. Gas never had it until higher octane requirements for higher compression automobiles occurred. Cheapest way to increase the octane rating of gasoline is to add tetra-ethyl lead to it. When I was in the military we had scads of aircraft with recips. Military went to 115 octane avgas. It had so much lead in it that when you drained the sumps it left a white residue on your fingers. The spark plugs on some of the engines, especially the old Franklins, would constantly foul with lead deposits. Looked like the electrodes were soldered together.
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Today's Featured Article - Tractor Profile: Oliver 70 Row Crop - by Staff. The Oliver 70 was part of the "Fleetline Series" and was manufacturered from 1937 to 1948. The row-crop configuration could have either dual or single front wheels. The Oliver 70 was also offered in the standard, orchard and industrial configurations. The tractors were sold in Canada. An early advertisement states "Power when you want it - power when you need it - power to help put in crops when field conditions are right and time and help are limited. That's the power you'll find in an Oliv
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