The transition from gasoline to diesel fuel in early old tractor models delivered superior fuel economy and torque for heavy field work. Diesel engines provided the low-end pulling power necessary to drag heavy plows through thick clay soil without stalling. This engineering shift laid the technical foundation for modern high-efficiency agricultural powertrains used worldwide today. https://www.aniarticles.com/78920-can-we-save-this-old-tractor-before-it-turns-to-rust