Name: ACDelco GM Original Equipment Dex-Cool 50/50 Pre-Mix Engine Coolant
Brand: ACDelco
SKU: 12378390

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.

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.

Independent and not affiliated. Coolant.com is not affiliated with, sponsored by or endorsed by any coolant or vehicle maker or retailer listed here, and we earn nothing from these links. Brand and spec names are used only to identify products. Every field comes from the manufacturer's own page or datasheet, checked 22 October 2026. "Not published" means we could not find it in that source. We record no prices.

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
OEM / industry specs listed	not published
ASTM standards listed	not published
Service life claim	not published
Freeze point (as published)	-37 °C / -34 °F
Free-of claims	nitrite-free, borate-free, silicate-free, phosphate-free
Datasheet	not published
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).

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

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.

Compare this coolant side by side

Open the comparison →

Prestone Heavy Duty Antifreeze + Coolant 50/50 Prediluted (Prestone, Premix 50/50)
Prestone Command Nitrite Free Extended Life Antifreeze + Coolant (Prestone, Concentrate)
Prestone Cor-Guard Command Nitrite Free Extended Life Antifreeze + Coolant (Prestone, not published)
Prestone Prime DEX-COOL Compatible Orange Antifreeze + Coolant (Prestone, not published)
PEAK DEX-COOL 50/50 Prediluted Antifreeze + Coolant (PEAK, Premix 50/50)
PEAK DEX-COOL Concentrate Antifreeze + Coolant (PEAK, Concentrate)

More from ACDelco

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.

Sources

ACDelco product page (status on 22 Oct 2026: 403 to automated check; page read via fetch 2026-10-22)

ACDelco GM Original Equipment Dex-Cool 50/50 Pre-Mix: specs and approvals