Quick answer
Hyundai coolant: genuine Hyundai Long Life Coolant is a silicate- and borate-free pre-mix per Hyundai Mobis. Aftermarket makers cite the Hyundai/Kia spec MS591-08. Hyundai manuals call for 35–60% antifreeze mixed with distilled or deionised water.
Hyundai coolant at a glance
Genuine coolant
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Spec codes to look for
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Matching products
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On this page
What coolant does Hyundai use?
- A 2026 Hyundai owner's manual says to use "only deionized water, distilled water, or soft water" when adding coolant, never alcohol or methanol coolant, and not more than 60% or less than 35% antifreeze. [1]
- Hyundai Mobis describes Genuine Hyundai Long Life Coolant Pre-mixed (ACF79IHE04) as "designed and approved by Hyundai engineers" and free of silicates and borates. [2]
- Coolant makers that target Hyundai cite the Hyundai/Kia spec MS591-08.
How Hyundai coolant changed over the years
Hyundai's current manuals combine a very long first coolant change with a short repeat interval afterwards [3], and are specific about the water you mix with it [1].
2026 LX3 schedule
Hyundai genuine coolant Not stated in schedule
First at 120,000 mi / 120 months, then every 24,000 mi / 24 months [3]
Genuine product
Hyundai Long Life Coolant Pre-mixed, ACF79IHE04 Not stated
Silicate- and borate-free [2]
Mixing limits
Antifreeze 35–60% —
Deionised, distilled or soft water only [1]
Hyundai coolant chemistry
Hyundai Mobis says its genuine coolant is free of silicates and borates [2]. Coolant makers that target Hyundai cite the spec MS591-08.
Known Hyundai coolant issues
- Hyundai warns against alcohol- or methanol-based coolant and against mixing it in [1].
- The second interval in the 2026 schedule (24,000 mi / 24 months) is much shorter than the first [3], so a car past its first change needs coolant far more often than when new.
Genuine Hyundai coolant we list
All genuine Hyundai products and the details Hyundai publishes are on the Hyundai coolant brand page.
Aftermarket coolants listing a Hyundai code
4 products in our data list one of these codes, per their maker:
Codes these products list (tap for every match)Hyundai/Kia MS591-08 4
Coolants whose maker mentions Hyundai
4 more only mention Hyundai in application text, which is weaker than a code:
Other car makes
Other car makes
Compare Hyundai with Kia, Subaru, Ford or Mazda and you will often find a different code or chemistry. Our coolant mixing guide explains the risk of topping up across them, and the index of car makes has the rest.
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Our best coolant for Hyundai & Kia page puts the genuine coolant and the aftermarket products that list a matching code side by side, with buying links. It is not a test or ranking.
Frequently asked questions
How often should Hyundai coolant be changed?
The 2026 LX3 schedule says first at 120,000 miles or 120 months, then every 24,000 miles or 24 months.
What water can I use with Hyundai coolant?
Only deionised, distilled or soft water, per Hyundai.
What strength should Hyundai coolant be?
Between 35% and 60% antifreeze, according to the 2026 manual.
Is Coolant.com affiliated with Hyundai?
No. We are independent of Hyundai.
Hyundai coolant part numbers and spec codes
Quote these numbers at a parts counter. Each comes from the Hyundai listing linked in its row, and your manual still decides.
| Genuine product | Part no. | Code shown | Listing |
|---|---|---|---|
| Hyundai Long Life Coolant (Pre-mixed) | ACF79IHE04 | none printed | mobismea.com |
Repair manuals & accessories
Repair manual for your car
Haynes repair manual for Hyundai
Step-by-step procedures, including draining, refilling and bleeding the cooling system. Manuals cover specific models and years: check the coverage on the cover before you buy.
Examples of the tool type, not a test or ranking by us. Check fit and instructions before you buy. See the full cooling system tools guide.
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How we source this page
- Facts come from manufacturer pages, datasheets, owner's manuals and standards bodies, linked under Sources.
- We do not test products, and no brand pays to be listed or ranked. Advertising and affiliate links are labelled and never change the data.
- Anything we could not find is marked "not published" rather than guessed. Spotted an error? Tell us.
Sources
Sources
- Hyundai owner's manual (2026, MEa): Coolant
- Hyundai Mobis: Hyundai Long Life Coolant 5L (ACF79IHE04)
- Hyundai owner's manual (2026, LX3): Normal Maintenance Schedule
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