2018 Hyundai Sonata
Vehicle Specs & Maintenance Data
The 2018 Hyundai Sonata maintenance specs on this page cover the key fluids, torque values, and wear items you need for routine service. Use these numbers as a quick reference when performing oil changes, tire rotations, brake jobs, and other scheduled maintenance on your Hyundai Sonata.
For oil changes, the 2018 Hyundai Sonata takes 5W-30 Full Synthetic motor oil with a capacity of 4.8 quarts. Brake fluid type is DOT 3, the recommended coolant is Phosphate-based Green/Blue, and transmission fluid is SP-IV-M (ATF). Always use the manufacturer-recommended fluids to maintain warranty coverage and engine longevity.
When mounting wheels on the Hyundai Sonata, torque the lug nuts to 79-94 ft-lbs using a calibrated torque wrench. Over- or under-torquing can lead to warped brake rotors or loose wheels. Re-torque after 50 to 100 miles on newly installed wheels.
There is 1 NHTSA safety recall on file for the 2018 Hyundai Sonata. Check the Recalls tab below for full details.
Specifications on this page are compiled from multiple publicly available sources including manufacturer documentation, NHTSA data, and automotive databases. Always cross-reference with your owner's manual or official factory documentation before purchasing parts or performing any service.
The 2018 Hyundai Sonata uses 5W-30 Full Synthetic motor oil (4.8 qt capacity), requires lug nuts torqued to 79-94 ft-lbs, takes DOT 3 brake fluid.
Enter a diagnostic trouble code to see causes, symptoms, and fixes for the 2018 Hyundai Sonata.
No known problems reported for this vehicle yet.
1 NHTSA safety recall for the 2018 Hyundai Sonata. Check your VIN at NHTSA.gov
LATCHES/LOCKS/LINKAGES:TRUNK LID:LATCH
Hyundai Motor America (Hyundai) is recalling certain 2017-2018 Sonata, 2016-2018 Sonata Hybrid, 2018-2020 Accent, and 2016-2017 Azera vehicles. The trunk latch may become damaged, preventing the opening of the trunk from the inside. As such, these vehicles fail to comply with the requirements of Federal Motor Vehicle Safety Standard number 401, "Internal Trunk Release."
A person inside the trunk compartment may become trapped, increasing their risk of injury.
Dealers will replace the trunk latch base, free of charge. Owner notification letters were mailed December 4, 2021. Owners may contact Hyundai customer service at 1-855-371-9460. Hyundai's number for this recall is 208.