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The 2003 Hyundai Sonata requires 5W-30 oil and has a capacity of 4.5 quarts for its 2.4 L inline-4 engine. It is essential to use high-quality oil to keep the engine running smoothly. Neglecting the oil can lead to various issues, such as a strong burning smell indicating a potential problem that should be addressed promptly to prevent serious damage, including engine failure or even an explosion. Symptoms of bad oil include engine knocking noises and decreased gas mileage. Regular oil changes, typically every 5,000 to 10,000 miles, are recommended to maintain engine health and prevent potential complications. Failure to replace the oil as needed can result in serious engine problems.
The standard engine in the 2003 Hyundai Sonata, the 2.4L inline-4, requires 4.5 quarts of synthetic oil. For the upgraded engine option, the 2.7L V6, you will need 4.8 quarts of synthetic oil. Hyundai offers various oil viscosities depending on the weather where you are: choose between 5W30 or 5W40 for temperatures below 95 F, 10W30, 10W40, or 10W50 for temperatures higher than -9 F, and 20W40 or 20W50 for temperatures above 32 F.