GM’s modern vehicles typically use Dex-Cool orange long-life antifreeze; older GM models commonly used green coolant. The color is a quick clue to the coolant type your GM car requires and how to maintain the cooling system.
Dex-Cool: GM's orange long-life coolant
Dex-Cool is GM’s orange, long-life antifreeze designed for use in many of its modern engines. It is intended to provide extended protection against corrosion and overheating, and it is a key part of GM’s cooling-system maintenance for a large portion of its lineup. Dex-Cool has faced public scrutiny in the past due to reported issues in some vehicles when maintenance schedules or mixing guidelines weren’t followed.
What is Dex-Cool?
Dex-Cool is a type of coolant GM promotes for its newer vehicles. It uses a hybrid organic acid technology (HOAT) formulation and is easy to recognize by its orange color. The orange tint helps technicians and drivers distinguish it from older green coolants and other formulas, reducing the risk of accidental mixing.
Why orange?
The orange color serves as a visual cue to prevent mixing with non-GM or older greens and to indicate the specific chemistry GM recommends for many of its engines. Proper use and maintenance of Dex-Cool help protect engine components and the radiator, water pump, and other cooling-system parts.
Color history in GM vehicles
Here are the key color standards GM has used over the years to help you identify the right coolant for your vehicle.
- Pre-Dex-Cool era: GM vehicles commonly used green conventional coolant (inorganic acid technology).
- Mid-1990s onward: GM standardized on Dex-Cool orange long-life coolant for most models.
- Market and model variations: Some individual vehicles or regional markets may have specific requirements; always verify with the owner’s manual or a GM-certified technician.
In short, the standard color for most modern GM coolant is orange Dex-Cool, with earlier GM models using green coolant.
Maintenance and best practices
Before servicing or replacing coolant, it helps to know the general guidelines around GM’s coolant color and compatibility.
- Use the coolant specified by GM for your vehicle, typically Dex-Cool orange for newer GM models.
- Avoid mixing Dex-Cool (orange) with green or other non-GM coolants, as mixing can cause chemistry conflicts or sludge formation.
- If your vehicle previously contained a different color coolant, a full cooling-system flush is often recommended before refilling with Dex-Cool.
- When in doubt, consult the owner’s manual or a GM-certified technician to confirm the correct coolant and service intervals.
Following these guidelines helps prevent cooling-system issues and ensures the correct color and chemistry remain in the system.
Summary
The color you’ll most commonly encounter in GM vehicles today is orange Dex-Cool for the coolant. Older GM models used green coolant. Always use GM-approved Dex-Cool or an equivalent that meets GM specifications, and avoid mixing coolant colors. When servicing, verify with the owner’s manual or a qualified technician to maintain optimal engine cooling and longevity.