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The 2009 Hyundai Sonata has two different engine options. Both engines need either SAE 5W-20 synthetic or SAE 5W-30 synthetic motor oil, but the smaller 2.4L 4Cylinder engine holds 4.5 quarts (4.4 liters), while the larger 3.3L V6 engine holds 5.5 quarts (5.2 liters). It's best to opt for the oil with the lower values, like SAE 5W-20, for better viscosity and temperature performance. Choosing SAE 5W-20 can help your engine run smoothly for longer and potentially improve fuel efficiency. Although SAE 5W-30 might be cheaper upfront, it can lead to higher costs down the road.
Hyundai recommends using 5W-20 detergent oil for the 2009 Hyundai Sonata. The oil capacity for the 2.4L engine is 4.5 US quarts (4.4 liters), while the 3.3L engine requires 5.5 US quarts (5.2 liters).