How much?
G1.6 T-GDi 4.76 US qt (4.5 L). G2.5 GDi 5.49 US qt (5.2 L).
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In-depth guide
2021 Hyundai Sonata
2021 Sonata coolant is 4.76 US qt for the G1.6 T-GDi and 5.49 US qt for the G2.5 GDi. First replacement is 120,000 miles or 120 months.
| Item | Figure |
|---|---|
| G1.6 T-GDi | 4.76 US qt (4.5 L). |
| G2.5 GDi | 5.49 US qt (5.2 L). |
| Interval | First at 120,000 miles or 120 months. Thereafter every 30,000 miles or 24 months. Both engine charts. |
Source: owner's manual / last verified 2026-10-16 (2021 Hyundai Sonata owner's manual, recommended lubricants and maintenance (opens in a new tab)).
Difficulty, time, and cost are estimates when this guide gives them. Torque is a cited figure, or it is left off.
Main source: 2021 Hyundai Sonata owner's manual, recommended lubricants and maintenance (opens in a new tab), Hyundai Motor America, published 2020-08-20, read 2026-10-16.
Funnel
For the distilled-water mix after the system is cool.
| Item | Figure | Where it comes from |
|---|---|---|
| G1.6 T-GDi | 4.76 US qt (4.5 L). | Recommended lubricants and capacities |
| G2.5 GDi | 5.49 US qt (5.2 L). | Recommended lubricants and capacities |
| Interval | First at 120,000 miles or 120 months. Thereafter every 30,000 miles or 24 months. Both engine charts. | Normal maintenance schedule |
G1.6 is 4.76 US qt. G2.5 is 5.49 US qt.
Ethylene glycol base for an aluminum radiator.
First at 120,000 miles or 120 months, then every 30,000 miles or 24 months.
2021 Sonata Owner's Manual. The PDF title is 2021 Sonata Owners Manual and the file was created August 20, 2020. Oil is the engine oil guide.
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Part
Ethylene glycol coolant for a 2021 Hyundai Sonata
For an aluminum radiator, mixed with distilled water. No brand part number is printed in the capacity table.
2021 Sonata coolant (opens in a new tab)Search Amazon.com (affiliate link) (opens in a new tab)As an Amazon Associate I earn from qualifying purchases.
Tool
Funnel
For the distilled-water mix after the system is cool.
G1.6 T-GDi 4.76 US qt (4.5 L). G2.5 GDi 5.49 US qt (5.2 L).
First at 120,000 miles or 120 months, then every 30,000 miles or 24 months.
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These guides cover the same kind of work. Their numbers belong to those vehicles, not to this one.
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