Zerex Dex-Cool Concentrate: specs and approvals

Updated 22 October 2026 · Independent, sourced reference

Summary

Zerex Dex-Cool Concentrate coolant data, from Zerex's own source. Zerex Dex-Cool Concentrate Coolant is a concentrate OAT ethylene glycol-based coolant listed by Valvoline Global Operations. The manufacturer lists 10 OEM or industry spec codes, including GM 6277M. Stated service life: up to five years or 240,000 kilometres.

Disclaimer: General information only, not professional advice. Always use the coolant specified in your vehicle owner's manual. Using the wrong coolant can damage an engine.
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Specifications

BrandZerex
MakerValvoline Global Operations
ProductZerex Dex-Cool Concentrate Coolant
Part numbers (as published)not published
Sizes (as published)not published
ChemistryOAT
Base glycolEthylene glycol
ColourOrange
Premix or concentrateConcentrate
OEM / industry specs listedGM 6277M, GMW 3420, MS-12106, WSS-M97B44-D, WSS-M97B44-D2, SAE J814, SAE J1034, SAE J1941, TMC RP-302B, US Fed. Spec A-A-870A
ASTM standards listedASTM D3306
Service life claimup to five years or 240,000 kilometres
Freeze point (as published)not published
Free-of claimsphosphate-free, silicate-free, borate-free, nitrate-free, amine-free, nitrite-free
Datasheetdatasheet
Sourcemanufacturer page
Last checked22 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 MS-12106 per Antifreeze is glycol plus inhibitors. Choose it by your vehicle's specification. (Chrysler / FCA / Stellantis)
  • Meets WSS-M97B44-D per Antifreeze is glycol plus inhibitors. Choose it by your vehicle's specification. (Ford)
  • Meets WSS-M97B44-D2 per Antifreeze is glycol plus inhibitors. Choose it by your vehicle's specification. (Ford)
  • Meets SAE J814 per Antifreeze is glycol plus inhibitors. Choose it by your vehicle's specification. (SAE)
  • Meets SAE J1034 per Antifreeze is glycol plus inhibitors. Choose it by your vehicle's specification. (SAE)
  • Meets SAE J1941 per Antifreeze is glycol plus inhibitors. Choose it by your vehicle's specification. (SAE)
  • Meets TMC RP-302B per Antifreeze is glycol plus inhibitors. Choose it by your vehicle's specification. (TMC (heavy-duty truck))
  • Meets US Fed. Spec A-A-870A per Antifreeze is glycol plus inhibitors. Choose it by your vehicle's specification. (US federal)
  • 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; Saab, Opel Approved; also lists ASTM D3306, Federal Specification A-A-870A, Fiat Chrysler MS12106, Ford WSS-M97B44-D, WSS-M97B44-D2, SAE J814, J1034, J1941, TMC of ATA RP-302B.

"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 as a concentrate: dilute with distilled or deionised water as the label directs. See premix vs concentrate and the freeze and boil calculator.

Note: Valvoline PI sheet from Valvoline's document portal (Australia/NZ edition, kilometres).

Always check your owner's manual first. Use the coolant spec printed in your owner's manual or service information. A listing here is the manufacturer's own claim (meets, exceeds, approved or recommended, worded as they put it). It is not our approval and not a fitment guarantee for your vehicle. If in doubt, ask your dealer or a qualified mechanic.

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.

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Sources

  1. Zerex product page (status on 22 Oct 2026: PDF read 2026-10-22)
  2. Zerex datasheet / spec sheet