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.
Specifications
| Brand | Zerex |
|---|---|
| Maker | Valvoline Global Operations |
| Product | Zerex Dex-Cool Ready To Use Coolant |
| Part numbers (as published) | not published |
| Sizes (as published) | not published |
| 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 |
| Freeze point (as published) | not published |
| Free-of claims | phosphate-free, silicate-free, borate-free, nitrate-free, amine-free, nitrite-free |
| Datasheet | datasheet |
| Source | manufacturer page |
| Last checked | 22 October 2026 |
Specs and approvals listed by the manufacturer
- Meets GM 6277M per Antifreeze is glycol plus inhibitors. Choose it by your vehicle's specification. (GM)
- Meets GMW 3420 per Antifreeze is glycol plus inhibitors. Choose it by your vehicle's specification. (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.
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
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.
Compare this coolant side by side
Open the comparison →Related products with the same listed chemistry
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- PEAK ORIGINAL EQUIPMENT TECHNOLOGY Concentrate Antifreeze + Coolant for North American Vehicles - ORANGE (PEAK, Concentrate)
- HD Expert EXTEND Antifreeze/Coolant (Recochem, Premix 50/50)
- OEM Extended Life ORANGE Antifreeze/Coolant (Recochem, Concentrate and Premix 50/50)
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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.
Sources
- Zerex product page (status on 22 Oct 2026: PDF read 2026-10-22)
- Zerex datasheet / spec sheet