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 - Oliver 550 Purchaser Checklist - by Greg Sheppard. Pound for pound the 550 is better than anything I've seen. It has great power for its size and can really hunker down and lug. Classified as a 3-bottom plow depending on soil conditions. I personally don't think it can be beat for a utility tractor in the 40 HP range. They are extremely thrifty on fuel, at least my DSL is. Most drive train parts are fairly easy to get. Sheet metal is probably the hardest thing to
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