Lead compounds are added to gasoline to improve the 'knocking point', The point at which the engine compression causes some pre-ignition. Which may damage your engine. There are other materials than lead compounds that will have the same desirable effect.
Lead is a toxic material and damages people and the environment. One should avoid leaded gas. In some quite old cars, the lead in the gas aids with lubrication in the cylinder, but the problems still remain.
leaded fuel provides better protection to your motor. the down side is it releases lead into the atmosphere. causing crops to absorb the lead. then transferred to people. lead poisoning.
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disadvantages *not to scale *there are limitations
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