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The 2008 Hyundai Sonata comes with either a 2.4 L 4Cylinder or a 3.3 L V6 engine, and it requires 5W-20 Synthetic Motor Oil for all temperatures, or 10W-30 for temperatures above 0 F. The oil capacity is 4.5 quarts with a filter for the 2.4 L engine, and 5.5 quarts with a filter for the 3.3 L engine. The torque for the drain plug is 29 to 32 ft/lbs for the 2.4 L engine and 25 to 32 ft/lbs for the 3.3 L engine. Maintaining the oil is crucial to keeping the engine clean, but it needs to be changed periodically. To keep your Sonata running smoothly, it's recommended to change the oil and filter every 7,500 miles.
The 2008 Hyundai Sonata with the standard 2.4L inline-4 engine needs 4.5 quarts of oil, while the upgraded 3.3L V6 engine can hold up to 5.5 quarts. You can use either 5W20 (recommended) or 5W30 (alternative) oil for both engine types.