User:Milton Beychok/Sandbox

Gasoline moved to Namespace as a developing article.

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Tetra-ethyl lead, commonly referred to as TEL, is a viscous liquid with the chemical formula (CH₃CH₂)₄Pb. Once widely used (circa 1925 to 1990) to increase the octane rating of gasoline (petrol), TEL usage in gasoline has been largely phased out by most nations primarily because of the toxicity of the lead emissions from internal combustion engines burning gasoline containing TEL. Another reason for discontinuing TEL usage was that it degraded the efficiency of the catalytic converters installed in automotive vehicles to reduce their emissions of air pollutants.