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In order for the 2018 Hyundai Sonata's 1.6L 4-cylinder engine to operate smoothly, it requires 4.8 quarts of either 5W-30 or 5W-20 oil. Quality oil is essential to maintain engine performance. Over time, if the oil becomes old or contaminated, it can lead to engine issues such as knocking noise, decreased fuel efficiency, and a burning odor, which should be addressed promptly to prevent potential engine failure. It is advisable to change the oil every 5,000 to 10,000 miles to ensure optimal engine health and prevent problems down the road.
In the 2018 Hyundai Sonata, you should use a synthetic blend oil like SAE 5W-30 or 5W-20. The 1.6L 4-cylinder engine works best with 5W-30 and needs about 4.8 quarts. For the 2.0L 4-cylinder engine, it's recommended to use 5W-20 and it requires around 4.3 quarts. The 2.4L 4-cylinder engine is versatile and can take either 5W-30 or 5W-20, holding approximately 5.1 quarts of oil.
I recommend referring to your owner's manual for guidance.
The 2018 Sonata does not require synthetic oil; instead, it uses 5w 20 Standard Oil.