Just like a used vehicle, the age and mileage of a used engine play a major role in its reliability and longevity. Ideal mileage for engines with fewer than 80K miles, though up to 100K miles is acceptable with good maintenance history. Make sure the engine year matches your vehicle model range. For example, the 2012 Fiat 500 uses a different engine variant than the 2017 model. https://carpartsstoreusa.com/