Best and Worst Features of Fiat Engines

As long-time owners and enthusiasts of Fiat vehicles, we're always looking to improve our understanding of what makes them tick - literally. The engine is a crucial component of any car, and Fiat's offerings have had their fair share of praise and criticism over the years. In this thread, I'd like to gather opinions on the best and worst features of Fiat engines. From the reliability of the MultiAir system to the performance capabilities of the 500 Abarth's 1.4-liter turbocharged unit, we've all experienced our own set of positives and negatives when it comes to powering our Fiats. Whether you're a seasoned mechanic or just a proud owner of a Fiat, I'd love to hear about your experiences with the engine in your vehicle. What do you love most about your car's powerplant? Are there any features that drive you crazy? Let's get the discussion started and see if we can't shed some light on what makes Fiat engines so... well, Fiatacious!