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Why can't all engines use ethanol?

Updated: 10/24/2022
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16y ago

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Modern engines can run some Ethanol. Modern gasoline engines are now set up to run E10, which is a mixture of 10% ethanol. To use higher percentages like E85, which is 85% Ethanol, engines need appropriate seals, hoses and engine settings (timing, etc.). Vehicles set up to run E85 have been selling for a number of years and are sold as "Flex Fuel" vehicles. Such vehicles have a fuel sensor in the fuel line to monitor the mix of gasoline and ethanol present and adjust the engine appropriately for the fuel being used. Either all gasoline can be used or any mixture of ethanol up to 85% ethanol (E85). Running E85 in a vehicle not set up for this mixture will damage seals and fuel lines.

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