Do Subarus take green coolant?
Most Subarus use a green-tinted long-life coolant that is ethylene glycol-based, but color alone isn’t a reliable guide to compatibility. Always follow the coolant specification in your owner’s manual or Subaru Genuine Coolant, and avoid mixing different types.
What color means for Subaru coolant and why it matters
Color codes for coolant vary by model year and market, and manufacturers sometimes change formulations. For Subarus, the crucial factor is meeting the engine cooling system’s specification rather than sticking to a particular color. Here is how to navigate the issue.
- Use a coolant that is silicate-free and designed for aluminum engines, since many Subaru engines use aluminum components.
- Prefer Subaru Genuine Long-Life Coolant or a universal coolant labeled as compatible with Subaru vehicles and certified to the same specification.
- Avoid Dex-Cool or other coolants that are not silicate-free or not intended for Subaru engines, as improper mixtures can cause deposits and corrosion.
- Do not mix coolant types; if you are unsure about what’s in the system, flush and refill with the recommended coolant.
- Check whether the system is premixed or concentrated. If concentrated, dilute with distilled water according to the label before filling.
In practice, starting with the owner’s manual is the best move. If you’re at a shop, ask for coolant that explicitly meets Subaru’s specification for your model year.
How to check and maintain your Subaru's cooling system
Regular maintenance keeps the cooling system healthy and protects against overheating and corrosion. Here are the recommended steps for Subarus.
- Consult the owner’s manual for the recommended service interval for coolant replacement, which often ranges every 5 years or a set mileage, depending on the model.
- Use only coolant labeled as meeting Subaru’s specification or Subaru Genuine Coolant; avoid generic green coolant unless it explicitly states compatibility with Subaru vehicles.
- When topping off between services, ensure the coolant type and color match the existing system to prevent mixtures that could cause issues.
- Have the cooling system pressure-tested if you notice overheating, leaks, or a drop in cooling performance.
Following these steps helps maintain optimal engine temperature, protect against corrosion, and extend the life of cooling-system components.
Bottom line
Color alone is not a reliable indicator of compatibility for Subaru cooling systems. Use the specification in your owner’s manual or Subaru Genuine Coolant, and avoid mixing different coolant chemistries. If in doubt, have the system serviced by a Subaru-trained technician.
Summary
Subarus generally require a ethylene glycol-based, silicate-free long-life coolant, with color not serving as a definitive guide to compatibility. Always verify the exact specification for your model year and market, and opt for Subaru Genuine Coolant or a certified alternative. Regular maintenance and correct coolant selection help maintain cooling performance and protect aluminum components over the life of the vehicle.
