The Kia Optima Engine comes with a variety of engines across model years, ranging from fuel-efficient four-cylinders to turbocharged powerhouses. Common engines include the 2.4L inline-4, which provides dependable power for daily driving, and the 2.0L turbocharged 4-cylinder, which increases horsepower and torque for better performance. With advances in direct injection and turbocharging, these engines combine efficiency with the ability to manage both city and highway driving seamlessly.