Tetraethyl lead, commonly abbreviated as TEL, is an organolead compound with the chemical formula Pb(C2H5)4. This clear, highly toxic liquid was historically used as a gasoline additive to increase octane levels and reduce engine knock in internal combustion engines. By improving combustion stability, tetraethyl lead played a major role in fuel formulation throughout much of the twentieth century. Although once widely incorporated into automotive gasoline, the use of TEL has been largely phased out due to serious environmental contamination and public health concerns associated with lead exposure. Today, tetraethyl lead is primarily limited to certain aviation gasoline formulations and select specialty chemical applications where its performance characteristics are still required. Because TEL is extremely toxic and can cause severe neurological and systemic health effects through inhalation, ingestion, or skin absorption, strict handling and storage controls are mandatory. It must be managed in secure, clearly labeled containers with appropriate ventilation and personal protective equipment. Despite its controversial legacy, tetraethyl lead remains an historically significant fuel additive and specialty chemical component within tightly regulated industrial contexts.

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