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The 2005 Kia Optima requires 5W-20 oil. It is important to change the oil periodically, ideally every 5,000 to 10,000 miles. Failure to change the oil can lead to engine issues. Using high-quality oil is crucial for optimal engine performance. Neglecting oil maintenance can result in a strong burning smell, which should be addressed promptly to prevent potential engine damage. Old or low-quality oil can cause the engine to fail, leading to knocking noises and decreased fuel efficiency.
The 2005 Kia Optima is available with either the 2.4L inline-4 engine, requiring 5W-20 synthetic oil, or the 2.7L V6 engine, also needing 5W-20 synthetic oil.