Before you panic, lead hasn't been added to fuel since 1995. But according to Today I Found Out, "tetraethyl lead" was used in early model cars to help "reduce engine knocking, boost octane ratings, and help with wear and tear on valve seats within the motor." Then they discovered all of the health risks and pollution concerns associated with lead usage and started to phase it out in the 1970s. Deep dive into the science behind tetraethyl lead in the following video, then learn more about gasoline and the retired uses of lead.
Lead Was Once Added To Gasoline
Despite warnings, lead gasoline began production in 1923. It wasn't long before workers suffered from lead poisoning.
Gasoline Vs. Diesel - Explained
With a diesel engine, you have the fuel injected after the compression cycle.
Written by Curiosity Staff February 17, 2017
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