Gasolines may also be addressed with metallic deactivators, which might be compounds that sequester (deactivate) metallic salts that if not accelerate the formation of gummy residues. The metallic impurities may arise from the engine itself or as contaminants within the fuel. Detergents[edit] Butanol fuel – Fuel for inner combustion engines https://fernandofzpgv.scrappingwiki.com/647568/the_smart_trick_of_gasoline_price_usa_that_nobody_is_discussing