The 2018 Hyundai Sonata SE is designed to use synthetic engine oil rated SAE 5W-20 as the standard specification. If 5W-20 isn’t available, 5W-30 can be used temporarily, but you should revert to 5W-20 as soon as possible.
For the 2018 Sonata SE, Hyundai generally specifies full synthetic 5W-20 that meets API SN or newer standards, with ILSAC GF-5 or higher. In extremely hot climates or under severe service, 5W-30 may be acceptable as a short-term substitute; always consult the owner’s manual or your dealer for climate-specific guidance and warranty considerations.
Oil specifications
Below are the core specifications to ensure the oil meets Hyundai’s requirements for the Sonata SE. This list covers grade, type, and standards to look for when selecting oil.
- Viscosity: SAE 5W-20
- Oil type: Full synthetic motor oil
- Standards: API SN or newer; ILSAC GF-5 or higher
- Alternate option: 5W-30 may be used temporarily if 5W-20 is not available, as directed by the manual
- Brand alignment: Any reputable brand that meets the above specs is acceptable (e.g., Mobil 1, Castrol, Valvoline, etc.)
Always verify the recommendation in your owner’s manual and follow any dealer guidance for your climate and driving conditions.
Maintenance guidelines and capacity
Understanding capacity and change intervals helps plan maintenance without surprises. The following details support routine oil care for the Sonata SE.
- Oil capacity (with filter): About 4.4 quarts (4.2 liters); confirm with the manual for your exact engine variant
- Oil-change interval: Typically every 7,500 miles under normal driving with synthetic oil; in severe service or extreme conditions, follow the 3,750–5,000 mile guideline
- Oil filter: Replace at every oil change
- Documentation: Keep receipts and note mileage and oil grade in your vehicle’s maintenance log
Regular, engine-specified oil changes help protect the powerplant and support warranty requirements. When in doubt, consult the owner’s manual or a Hyundai service professional.
Additional notes and best practices
To ensure you’re aligned with the latest guidance, consider these practical tips as you plan oil changes for your 2018 Sonata SE.
- Always purchase oil that clearly meets API SN or newer and ILSAC GF-5 or higher
- Use a new oil filter at every change
- Dispose of used oil responsibly at a proper recycling facility
Following official specifications and maintenance intervals helps maintain performance, efficiency, and warranty coverage.
Summary
The 2018 Hyundai Sonata SE uses synthetic SAE 5W-20 oil as the standard specification, with 5W-30 as a temporary fallback if 5W-20 isn’t available. Always confirm with the owner’s manual or a Hyundai service advisor, and adhere to the recommended change intervals and capacity to keep the engine in optimal condition.