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DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2018 Hyundai SonataCoolant Type & Capacity
OEM spec from the factory service manual for the Eco variant.
Quick Answer
Coolant Type
50/50 mixture of Ethylene Glycol Antifreeze and water
Capacity
6.55 QTS.
6.19 L
Variant
Eco
Note: The engine coolant should be compatible with aluminum engine parts.
This vehicle's factory manual
The coolant spec is above. This opens the fluids section of the 2018 Hyundai Sonata Eco factory book.
What You'll Need
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Frequently Asked Questions
- What type of coolant does a 2018 Hyundai Sonata take?
- The 2018 Hyundai Sonata requires 50/50 mixture of Ethylene Glycol Antifreeze and water. The exact spec may vary slightly by engine variant — this page shows the OEM recommendation for the Eco configuration.
- How much coolant does a 2018 Hyundai Sonata hold?
- The 2018 Hyundai Sonata cooling system capacity is 6.55 QTS. (6.19 L).
- Can I use universal coolant in my 2018 Hyundai Sonata?
- It is strongly recommended to use coolant that meets the 50/50 mixture of Ethylene Glycol Antifreeze and water specification. Universal coolants may not provide the correct corrosion protection for your engine's materials.
- What happens if I use the wrong coolant in my 2018 Hyundai Sonata?
- Using coolant that does not meet the OEM specification can cause corrosion, gasket damage, and overheating. Always verify the correct coolant type before topping off or flushing the system.