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Older gasoline used to contain chemicals such as tetra-ethyl lead. This prevented preignition in the engine and allowed engines to be higher compression. They stopped using it because of heath and environmental issues. Different additives are used in todays car fuels instead. Leaded fuel can still be used in offroad equipment and airplanes.

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17y ago
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7mo ago

Gasoline used to contain lead as an additive to improve engine performance, but due to its harmful environmental and health effects, leaded gasoline was phased out. Gasoline without lead is simply referred to as unleaded gas.

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Q: Why is gas called unleaded?
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Unleaded gas is petrol. In some countries they call it petrol and in others it is called gasoline or gas.


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