* 2.4L Inline-4: This was the standard engine, producing 173 horsepower and 168 lb-ft of torque.
* 2.7L V6: This was the optional engine, offering more power with 249 horsepower and 198 lb-ft of torque.
So, the size of the engine in a 2010 Kia Optima depends on the specific trim level you're interested in.