Summary
ACDelco GM Original Equipment Dex-Cool 50/50 Pre-Mix coolant data, from ACDelco's own source. ACDelco GM Original Equipment Dex-Cool 50/50 Pre-Mix Engine Coolant is a 50/50 premix OAT ethylene glycol-based coolant listed by General Motors (ACDelco). The manufacturer's page we checked does not list OEM spec codes.
What to buy
ACDelco GM Original Equipment Dex-Cool 50/50 Pre-Mix Engine Coolant · Premix 50/50
Confirm that your owner's manual calls for this spec before you buy.
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Specifications
| Brand | ACDelco |
|---|---|
| Maker | General Motors (ACDelco) |
| Product | ACDelco GM Original Equipment Dex-Cool 50/50 Pre-Mix Engine Coolant |
| Part numbers (as published) | 12378390 |
| Sizes (as published) | 1 gal |
| Chemistry | OAT |
| Base glycol | Ethylene glycol |
| Colour | Orange |
| Premix or concentrate | Premix 50/50 |
| Freeze point (as published) | -37 °C / -34 °F |
| Free-of claims | nitrite-free, borate-free, silicate-free, phosphate-free |
| Not published by the maker | OEM / industry specs, ASTM standards, Service life claim, Datasheet. Check the product label or ask the manufacturer. |
| Source | manufacturer page |
| Last checked | 22 October 2026 |
Specs and approvals listed by the manufacturer
No OEM approval or spec codes are published on the source we checked. That does not mean the product fails any spec. It means the manufacturer did not list one there. Check the product label or ask the manufacturer.
Compatibility notes
- 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: GM Parts page does not list a GM spec code for this part; Dex-Cool is GM's trade name for its GM 6277M-type coolant (INFERENCE, not stated on this page).
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.
- parts.gmparts.com (link checked 22 Oct 2026)
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
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- Prestone Cor-Guard Command Nitrite Free Extended Life Antifreeze + Coolant (Prestone, not published)
- Prestone Prime DEX-COOL Compatible Orange Antifreeze + Coolant Check price (Prestone, not published)
- PEAK DEX-COOL 50/50 Prediluted Antifreeze + Coolant (PEAK, Premix 50/50)
- PEAK DEX-COOL Concentrate Antifreeze + Coolant Check price (PEAK, 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 (genuine coolant sold under this maker's parts brand)
More from ACDelco
- ACDelco All Seasons Coolant (Australia/NZ)
- ACDelco Blue OEM G-30 Coolant (Australia/NZ)
- ACDelco Red OEM G-40 Coolant (Australia/NZ)
- ACDelco Green OEM G-48 Coolant (Australia/NZ)
- ACDelco Purple OEM G-65 Coolant (Australia/NZ)
- ACDelco DEX-COOL Extended Life Coolant (Australia/NZ)
See every ACDelco product we list, with the chemistries and spec codes the maker names, on the ACDelco coolant brand page.
See all ACDelco 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?
ACDelco GM Original Equipment Dex-Cool 50/50 Pre-Mix Engine Coolant · Premix 50/50. 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
- ACDelco product page (status on 22 Oct 2026: 403 to automated check; page read via fetch 2026-10-22)