DirtFarmer wrote:
Lead in the gasoline served a dual purpose. It prevented knocking and helped to lubricate the valves. Older cars need a lead substitute to keep the valves healthy. And last I heard, small aircraft still use leaded gas because of the number of really old aircraft engines in service. I used to have a gasoline tractor from the '40s or early '50s. I had to buy fuel for it at the local airport.
Correct. Benefits for engines, but not so much for people.