Quick answer
Honda coolant: Honda owner's manuals specify Honda Long Life Antifreeze/Coolant Type 2, a 50/50 premix (the gallon part is OL999-9011 per a Honda dealer). Honda allows a non-silicate coolant only as a temporary replacement.
Honda coolant at a glance
Genuine coolant
Part number
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Spec codes to look for
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Matching products
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Confirm the code in your owner’s manual before buying.
On this page
What coolant does Honda use?
- The 2025 Accord owner's manual states: "Specified coolant: Honda Long Life Antifreeze/Coolant Type 2". It is "premixed with 50% antifreeze and 50% water. Do not add any straight antifreeze or water." [1]
- Honda says genuine coolant withstands freezing to about -31 °F (-35 °C). [1]
- If Honda coolant is not available, the manual allows "another major brand of non-silicate coolant as a temporary replacement", followed by a flush and refill with Honda coolant "as soon as possible". [1]
- A Honda dealer parts site lists the gallon part as OL999-9011, superseding CU08730, OL9999001, OL9999002 and OL9999012. [2]
How Honda coolant changed over the years
Honda and Acura have specified a single named fluid, Honda Long Life Antifreeze/Coolant Type 2, for about two decades, and earlier manuals called it Honda All Season Antifreeze/Coolant Type 2 [5]. Rather than a fixed date, newer Hondas tell you when to change it through the Maintenance Minder [3].
Early 2000s manuals
Honda All Season Antifreeze/Coolant Type 2 Not stated in the manual
"Do not add rust inhibitors or other additives" [5]
2002 S2000 (example)
Honda coolant Not stated
Replace at 120,000 mi / 10 years, then every 60,000 mi / 5 years [4]
Maintenance Minder era
Honda Long Life Antifreeze/Coolant Type 2 Not stated
Minder sub-code 5 = replace engine coolant [3]
2025 Accord
Type 2, premixed 50/50 Not stated
Freeze protection to about -31 °F (-35 °C) [1]
Honda coolant chemistry
Honda does not publish a chemistry family for Type 2 in the manuals we read. It only allows "non-silicate" coolant as a stop-gap [1], which tells you silicate-based green coolants are not what Honda intends.
Known Honda coolant issues
- Older Honda manuals specifically warned against adding rust inhibitors or other additives to the cooling system [5]. "Stop leak" and additive bottles are worth avoiding unless a Honda technician recommends one.
- If a non-Honda coolant goes in as a temporary fix, Honda asks for a flush and refill with Type 2 "as soon as possible" [1].
Genuine Honda coolant we list
All genuine Honda products and the details Honda publishes are on the Honda coolant brand page.
Aftermarket coolants listing a Honda code
3 products in our data list one of these codes, per their maker:
Codes these products list (tap for every match)Honda Type 2 3
Coolants whose maker mentions Honda
3 more only mention Honda in application text, which is weaker than a code:
Other car makes
Other car makes
Sibling pages: Nissan, Toyota, Mazda, Volkswagen. Each quotes its own manual, and none of them is interchangeable with Honda by default. If two cars in one household need different coolants, keep separate bottles; mixing coolant covers why. Full list in the make index.
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Our best coolant for Honda 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
What does Maintenance Minder code 5 mean on a Honda?
Sub-code 5 means replace the engine coolant, according to Honda's Maintenance Minder documentation.
Is Honda Type 2 coolant premixed?
Yes. The 2025 Accord manual says it is premixed 50/50 and that you should not add straight antifreeze or water.
Can I put additives in Honda coolant?
Older Honda manuals say not to add rust inhibitors or other additives.
Is Coolant.com affiliated with Honda?
No. We are independent of Honda.
Honda coolant part numbers and spec codes
Part numbers here are copied from each genuine listing we cite; confirm them against your Honda manual before ordering.
| Genuine product | Part no. | Code shown | Listing |
|---|---|---|---|
| Honda Long Life Antifreeze/Coolant Type 2 | OL999-9011 (supersedes CU08730, OL9999001, OL9999002, OL9999012) | Honda Type 2 | techinfo.honda.com |
Repair manuals & accessories
Repair manual for your car
Haynes repair manual for Honda
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
- Honda owner's manual, 2025 Accord: Engine Coolant
- Honda dealer parts site: OL999-9011 Coolant (Type 2)
- Honda: 2021 Insight Maintenance Minder System (PDF)
- Honda owner's manual: 2002 S2000 maintenance schedule (PDF)
- Honda owner's manual (early 2000s): cooling system (PDF)
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