Summary
PEAK Dex-cool 50/50 coolant data, from PEAK's own source. PEAK DEX-COOL 50/50 Prediluted Antifreeze + Coolant is a 50/50 premix OAT ethylene glycol-based coolant listed by Old World Industries. The manufacturer lists 2 OEM or industry spec codes, including GMW 3420. Stated service life: up to 10 years/150,000 miles.
What to buy
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Where to buyConfirm the specification in your owner’s manual before buying. Product examples are not a fitment guarantee.
Specifications
| Brand | PEAK |
|---|---|
| Maker | Old World Industries |
| Product | PEAK DEX-COOL 50/50 Prediluted Antifreeze + Coolant |
| Part numbers (as published) | PDCB53 |
| Chemistry | OAT |
| Base glycol | Ethylene glycol |
| Premix or concentrate | Premix 50/50 |
| OEM / industry specs listed | GMW 3420, GM 6277M |
| ASTM standards listed | ASTM D3306, ASTM D4985 |
| Service life claim | up to 10 years/150,000 miles |
| Free-of claims | nitrite-free, borate-free, silicate-free, phosphate-free, amine-free |
| Datasheet | datasheet |
| Not published by the maker | Sizes, Colour, 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 GMW 3420 per PEAK (GM)
- Meets GM 6277M per PEAK (GM)
- Meets ASTM D3306 per PEAK (industry test standard)
- Meets ASTM D4985 per PEAK (industry test standard)
Manufacturer wording: A GM-approved ethylene glycol based premium coolant that can be used in all GM vehicles 1995 and newer.
"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.
What the manufacturer says it is for
PEAK® DEX-COOL® Antifreeze + Coolant is designed for use in all GM passenger cars, SUVs and light/medium duty trucks 1995 and newer.
Quoted from the manufacturer's page. Coolant.com has not verified fitment for any vehicle, and a listed make or year range is the manufacturer's statement, not ours.
Alternatives that list the same spec
Other coolants whose makers list at least one of the same OEM codes as PEAK DEX-COOL 50/50 Prediluted Antifreeze + 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 |
| Zerex Dex-Cool Ready To Use Coolant Zerex · 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 GMW 3420, PEAK 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.
- Sold premixed: pour as supplied. Do not add water unless the label says to.
Where to buy
- oreillyauto.com (listed on the manufacturer page; the retailer blocks automated checks)
These links come from the manufacturer's own product page or official parts store. We do not show prices because they change and vary by store. Check that the part number and size match before you buy.
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
- Zerex Dex-Cool Concentrate Coolant Check price (Zerex, Concentrate)
- Zerex Dex-Cool Ready To Use Coolant Check price (Zerex, Premix 50/50)
- HD Expert EXTEND Antifreeze/Coolant (Recochem, Premix 50/50)
- OEM Extended Life ORANGE Antifreeze/Coolant (Recochem, Concentrate and Premix 50/50)
- OEM Extended Life ORANGE I Antifreeze/Coolant (Recochem, Concentrate and Premix 50/50)
- ACDelco DEX-COOL Extended Life Coolant (Australia/NZ) (ACDelco, Concentrate)
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 PEAK
- PEAK All Vehicles Concentrate Antifreeze + Coolant Check price
- PEAK All Vehicles 50/50 Prediluted Antifreeze + Coolant
- PEAK DEX-COOL Concentrate Antifreeze + Coolant
- PEAK Global Lifetime 50/50 Antifreeze + Coolant
- PEAK Global Lifetime Concentrate Antifreeze + Coolant
- PEAK TITANIUM 50/50 Prediluted Antifreeze + Coolant
See every PEAK product we list, with the chemistries and spec codes the maker names, on the PEAK coolant brand page.
See all PEAK coolants, coolants by brand or coolant by car make.
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- 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.