Will it hurt my car if I put unleaded +ethanol in it once by misstake when the car sales had unleaded only in it
Most gasoline in the US today is mixed with up to 10% ethanol, and it's fine to use. Don't use the E15
These engines are designed for unleaded Petrol. Check in the Owners Handbook first. also check on the inside of the filler cap. There is normally something there. Anything other then Unleaded petrol can damage the Oxygen Sensor.
Looking for a Used Fiesta in your area?
CarGurus has 16,726 nationwide Fiesta listings starting at $2,400.
Search Ford Fiesta Questions
Ford Fiesta Experts