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.
Specifications
| Brand | PEAK |
|---|---|
| Maker | Old World Industries |
| Product | PEAK DEX-COOL 50/50 Prediluted Antifreeze + Coolant |
| Part numbers (as published) | PDCB53 |
| Sizes (as published) | not published |
| Chemistry | OAT |
| Base glycol | Ethylene glycol |
| Colour | not published |
| 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 |
| Freeze point (as published) | not published |
| Free-of claims | nitrite-free, borate-free, silicate-free, phosphate-free, amine-free |
| Datasheet | datasheet |
| Source | manufacturer page |
| Last checked | 22 October 2026 |
Specs and approvals listed by the manufacturer
- Meets GMW 3420 per Antifreeze is glycol plus inhibitors. Choose it by your vehicle's specification. (GM)
- Meets GM 6277M per Antifreeze is glycol plus inhibitors. Choose it by your vehicle's specification. (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.
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.
Compare this coolant side by side
Open the comparison →Related products with the same listed chemistry
- Zerex Dex-Cool Concentrate Coolant (Zerex, Concentrate)
- Zerex Dex-Cool Ready To Use Coolant (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)
More from PEAK
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- PEAK All Vehicles 50/50 Prediluted Antifreeze + Coolant
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- PEAK Global Lifetime 50/50 Antifreeze + Coolant
- PEAK Global Lifetime Concentrate Antifreeze + Coolant
- PEAK TITANIUM 50/50 Prediluted Antifreeze + Coolant
See all PEAK 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
- PEAK product page (status on 22 Oct 2026: 200)
- PEAK datasheet / spec sheet