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The 2015 Hyundai Sonata requires 5.1 quarts of SAE 5W-20 oil. Hyundai suggests using synthetic oil for each oil change. There are two main types of oil: conventional, which is petroleum-based and older, and synthetic, which is newer and designed to offer improved protection and longer lifespan, requiring less frequent changes. Typically, synthetic oil can be changed every 7,500 miles, while conventional oil should be changed every 3,500 to 5,000 miles. It is advisable to check your oil monthly to ensure it remains clean from debris.
The engine oil guidelines for the 2015 Hyundai Sonata vary depending on the trim level you have. The Eco version can use 5W-30 or 5W-40 oil. Meanwhile, the Hybrid, Hybrid Limited, Limited, and SE models are recommended to use 5W-20 or 5W-30 oil. For the Limited 2.0T and Sport 2.0T variants, they should use 5W-30 or 5W-40 oil that meets the ACEA A5/B5 specifications.