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When you have the 1.4- or 1.6-liter 4-cylinder engine in the 2018 Hyundai Elantra, it requires 4.2 liters (4.4 quarts) of 5W-30 motor oil. If you have the 2.0-liter 4-cylinder engine, you'll need 4.0 liters (4.2 quarts) of 5W-20 oil. Both oils are synthetic and very similar, with the main distinction being how they perform in hotter weather. They are almost the same when it comes to starting in cold temperatures. Hyundai suggests changing this oil every 5,000 miles or 6 months, whichever comes first, but you should consider your individual driving habits. Your 2018 Elantra is designed with an oil light life indicator that will signal when it's time for a maintenance appointment. The typical cost for an oil change at a dealership ranges from $100 to $120, which includes labor.
The 2018 Hyundai Elantra uses a synthetic blend oil, with the 1.4L and 1.6L 4-cylinder engines recommending SAE 5W-30, while the 2.0L engine prefers SAE 5W-20. Oil capacities are 4.4 quarts for the 1.4L engine, 4.8 quarts for the 1.6L engine, and 4.2 quarts for the 2.0L engine.
Type of oil
The 2.0 Elantra requires 4.5 quarts of oil, preferably synthetic 5w20, which lasts significantly longer. At 5000 miles, only a top-up or half a quart is needed. It has been running full synthetic oil since reaching 54000 miles, and even after 130,000 miles, it is still going strong.
I've learned that using blended oil for up to 3,500 miles is the maximum recommended.