Kia Optima 2014 Automatic Gasoline mileage: 100 KM I have an Optima 2014 engine. The belt broke inside the engine, and the car was still running with no overheating or anything. The engineer told me the engine was gone and I replaced it with a new engine. After installing the new engine, I discovered that it was just the belt, and he wanted the old engine because it was only the belt inside it.