The alkyl lead compands found in gasoline can reduce the toxicity of exhaust by removing these compands when they are used in certain modern catalysts type engines. Unled gasoline is not more toxic than lead but, keep in mind if unled gasoline that is not supported by catalysts it may increase the risk of toxic intake...
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Some countries are using aromatic or olefin octane-improvers to replace lead compunds octane-improvers to reduce the lead intake for health reasons. According to researchers using aromatics will increase 40%, where other countries using a high octane unled fuels will increase up to 50% when using oxygenates...
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