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The recommended oil type and capacity for the 2.4 L engine in a 2014 Kia Optima is 5w-20 and 5.3 quarts, respectively. It's important to change your oil regularly to prevent engine problems. A good guideline is to change it every 5,000 to 10,000 miles. Using high-quality oil is crucial for engine performance and longevity. Neglecting oil changes can lead to issues such as a foul burning odor, which should be addressed promptly to avoid potential safety risks like engine failure or even explosion. In addition, failing to maintain proper oil levels could result in poor gas mileage and unexpected knocking noise from the engine.
In 2014, the Kia Optima takes about 5.3 quarts of engine oil for both the 2.0L and 2.4L engines. To keep it running smoothly, it's suggested to use 5W-20 oil for the 2.4L engine in any climate. As for the 2.0L engine, it's best to go with 5W-30 or 5W-40 oil.