Why do small aircraft still rely on leaded fuel decades after cars moved on?

Small aircraft engines often trace their design heritage back to World War II, requiring high-octane fuels that historically relied on lead. This video examines the complex intersection of chemistry, engineering, and regulation that has delayed the transition to lead-free alternatives and the challenges of adopting new fuels.

Many small aircraft engines were engineered during the World War II era, necessitating high-octane fuels that incorporated lead to function correctly. This legacy design has created a significant hurdle for modern aviation, as transitioning to alternative fuel sources is not a simple drop-in replacement.

The industry is currently navigating the transition toward lead-free aviation fuels. This shift introduces potential compatibility issues that operators and engineers must resolve over the coming decade to ensure safety and performance standards are maintained.

Source: Why Do Planes Still Use Lead In Fuel 30 Years After Cars Stopped?