Summary
Zerex Dex-Cool Ready To Use coolant data, from Zerex's own source. Zerex Dex-Cool Ready To Use Coolant is a 50/50 premix OAT ethylene glycol-based coolant listed by Valvoline Global Operations. The manufacturer lists 2 OEM or industry spec codes, including GM 6277M. Stated service life: up to five years or 240,000 kilometres.
What to buy
Zerex Dex-Cool Ready To Use Coolant · Premix 50/50 · lists GMW 3420
Confirm that your owner's manual calls for this spec before you buy.
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Specifications
| Brand | Zerex |
|---|---|
| Maker | Valvoline Global Operations |
| Product | Zerex Dex-Cool Ready To Use Coolant |
| Chemistry | OAT |
| Base glycol | Ethylene glycol |
| Colour | Orange |
| Premix or concentrate | Premix 50/50 |
| OEM / industry specs listed | GM 6277M, GMW 3420 |
| ASTM standards listed | ASTM D3306 |
| Service life claim | up to five years or 240,000 kilometres |
| Free-of claims | phosphate-free, silicate-free, borate-free, nitrate-free, amine-free, nitrite-free |
| Datasheet | datasheet |
| Not published by the maker | Part numbers, Sizes, Freeze point. Check the product label or ask the manufacturer. |
| Source | manufacturer page |
| Last checked | 22 October 2026 |
Specs and approvals listed by the manufacturer
- Meets GM 6277M per Zerex (GM)
- Meets GMW 3420 per Zerex (GM)
- Meets ASTM D3306 per Zerex (industry test standard)
Manufacturer wording: Valvoline PI sheet: "approved by General Motors to the GM 6277M specification"; DEX-COOL Approved, GM 6277M, GMW 3420.
"Meets X per manufacturer" is our shorthand for any of the manufacturer's own phrases: meets, meets or exceeds, approved, or recommended for applications requiring. It is the manufacturer's claim, not an approval by Coolant.com or by the vehicle maker. Codes are copied as published. Some sources list codes for compatibility rather than formal approval. The wording above shows which.
Alternatives that list the same spec
Other coolants whose makers list at least one of the same OEM codes as Zerex Dex-Cool Ready To Use Coolant. More shared codes first. Match the exact code in your manual, and do not mix chemistries when topping up.
| Product | Same code(s) |
|---|---|
| Motorcraft Orange Prediluted Antifreeze/Coolant Motorcraft · not published · Premix 50/50 | GM 6277M, GMW 3420 |
| PEAK DEX-COOL 50/50 Prediluted Antifreeze + Coolant PEAK · OAT · Premix 50/50 | GM 6277M, GMW 3420 |
| PEAK DEX-COOL Concentrate Antifreeze + Coolant PEAK · OAT · Concentrate | GM 6277M, GMW 3420 |
| Prestone MAX All Vehicles Antifreeze + Coolant Prestone · not published · not published | GM 6277M, GMW 3420 |
| Prestone Platinum All Vehicles Antifreeze + Coolant Prestone · not published · Concentrate and Premix 50/50 | GM 6277M, GMW 3420 |
| Zerex Dex-Cool Concentrate Coolant Zerex · OAT · Concentrate | GM 6277M, GMW 3420 |
Compatibility notes
- If your owner's manual calls for GM 6277M, Zerex lists that code for this product. Read the exact wording above, and confirm against your manual.
- Chemistry is listed as OAT. Mixing different chemistries can shorten coolant life. See OAT vs HOAT vs IAT and use the mixing checker before topping up.
- Colour is listed as Orange. Colour is a dye, not a spec, so two coolants of the same colour can be different chemistries. See coolant colours explained.
- Sold premixed: pour as supplied. Do not add water unless the label says to.
Note: Valvoline PI sheet from Valvoline's document portal (Australia/NZ edition). Other specs on the sheet are not reproduced here; open the sheet for the full list.
Where to buy
Amazon listings come from third-party sellers as well as Amazon. Check that the part number, size and premix/concentrate match before you buy.
As an Amazon Associate I earn from qualifying purchases. Commissions never change which products we list or what the data says.
We did not find a retailer link on the manufacturer's page that we could check. Try the manufacturer's own site: Zerex product page.
Related tool
Compare this coolant side by side
Open the comparison →Related products with the same listed chemistry
Related products with the same listed chemistry
- PEAK DEX-COOL 50/50 Prediluted Antifreeze + Coolant (PEAK, Premix 50/50)
- PEAK DEX-COOL Concentrate Antifreeze + Coolant Check price (PEAK, Concentrate)
- PEAK ORIGINAL EQUIPMENT TECHNOLOGY Antifreeze + Coolant 50/50 Prediluted for North American Vehicles - ORANGE Check price (PEAK, Premix 50/50)
- PEAK ORIGINAL EQUIPMENT TECHNOLOGY Concentrate Antifreeze + Coolant for North American Vehicles - ORANGE Check price (PEAK, Concentrate)
- HD Expert EXTEND Antifreeze/Coolant (Recochem, Premix 50/50)
- OEM Extended Life ORANGE Antifreeze/Coolant (Recochem, Concentrate and Premix 50/50)
Vehicle makes linked to this coolant
These make pages explain what each vehicle maker specifies. The reason each one links here is shown next to it. This is not a fitment claim, so check your owner's manual.
- What coolant GM / Chevrolet specifies (the manufacturer lists a spec code from this vehicle maker)
More from Zerex
- Zerex G05 Antifreeze Coolant
- Zerex G40 Antifreeze Coolant
- Zerex Asian Vehicle Blue Antifreeze Coolant
- Zerex Asian Vehicle Red Antifreeze Coolant
- Zerex Original Green Antifreeze Coolant
- Zerex Dex-Cool Concentrate Coolant
See every Zerex product we list, with the chemistries and spec codes the maker names, on the Zerex coolant brand page.
See all Zerex coolants, coolants by brand or coolant by car make.
Browse the full coolant directory, or use Find my car coolant to match the spec in your owner's manual.
Ready to buy?
Zerex Dex-Cool Ready To Use Coolant · Premix 50/50 · lists GMW 3420. Check that your owner's manual calls for it.
Check price on AmazonAll buying optionsAs an Amazon Associate I earn from qualifying purchases. Commissions never change which products we list or what the data says.
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
- Zerex product page (status on 22 Oct 2026: PDF read 2026-10-22)
- Zerex datasheet / spec sheet