Does Subaru require special coolant?
Yes. Subaru recommends using coolant that meets Subaru’s own specification, most commonly Subaru Genuine Long-Life Coolant or any coolant explicitly labeled as Subaru-approved. Using an unapproved coolant can cause cooling-system issues and may affect warranty coverage.
What Subaru recommends
Subaru’s official guidance centers on using a coolant that is compatible with Subaru engines and cooling systems. The simplest option is Subaru Genuine Long-Life Coolant, sold or specified by Subaru dealers. If you choose a third‑party coolant, ensure it is clearly labeled as meeting Subaru’s specification or as “Subaru-approved” to avoid compatibility problems. Do not mix coolants from different brands or types without confirming compatibility.
To help you identify suitable options, consider the following categories:
- Subaru Genuine Long-Life Coolant (pre-mixed 50/50 ready-to-use).
- Coolants explicitly labeled as Subaru-approved or meeting Subaru’s factory specification.
- Third‑party long‑life coolants that state compatibility with Subaru engines and do not contain additives known to damage aluminum components; always verify with a dealer or Subaru technical support before use.
In all cases, follow the model-year and manual-specific instructions for the correct product and mixing ratio, and avoid introducing coolants that aren’t approved by Subaru.
Maintenance and best practices
Proper coolant maintenance helps protect the engine and cooling system. Always verify the exact specification for your model year in the owner's manual or with a Subaru dealer, as requirements can evolve with new vehicles and coolant formulations.
Best-practice steps for maintaining Subaru cooling systems include:
- Check the coolant level when the engine is cold and inspect for leaks or signs of contamination.
- Use only Subaru Genuine Long-Life Coolant or a third‑party coolant clearly labeled as Subaru-approved or meeting Subaru specification.
- Do not mix different coolant types or brands unless you have confirmed compatibility with Subaru requirements.
- When changing coolant, drain and flush the system only if your service manual instructs it; otherwise follow the recommended refill procedure and bleeding/air‑purge process for your model.
- Pour in coolant until the system is at the correct level, then run the engine to operating temperature, check for air pockets, and recheck level after it cools.
Additionally, inspect hoses, clamps, radiator, and the reservoir regularly and replace any damaged components promptly to prevent leaks and overheating.
Important cautions
Avoiding common mistakes
Using coolant that is not Subaru-approved, or mixing incompatible products, can lead to corrosion, clogged passages, and cooling-system failure. Added stop-leak products or non-approved additives can also cause blockages and damage seals.
Always consult the owner’s manual or a Subaru dealer if you’re unsure about the correct coolant for your vehicle’s year and model. The wrong choice or improper maintenance can affect performance and warranty coverage.
Summary
In short, Subaru does require coolant that meets its own specification. The recommended path is to use Subaru Genuine Long-Life Coolant or any coolant explicitly labeled as Subaru-approved. When in doubt, verify with your owner's manual or a Subaru dealer, and follow the prescribed maintenance steps to keep the cooling system reliable and efficient.
