Can you tell me how big the diesel exhaust fluid tank is on a 2018 Ford F-250?

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The 2018 Ford F-250s have DEF tank sizes ranging from 2.5 to 7.5 gallons, depending on the vehicle trim level. Diesel models of this truck have slightly larger exhaust fluid tanks, with the smallest at 2.5 gallons and the largest at 7.5 gallons. DEF tanks handle a non-hazardous chemical solution called DEF, which is sprayed onto the exhausts and valves of diesel vehicles to reduce harmful emissions. It is separate from the diesel fuel and acts independently to control the car's emissions output.

Can you tell me how big the diesel exhaust fluid tank is on a 2018 Ford F-250?

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