For most Subaru Forester models, the recommended coolant is a 50/50 ethylene glycol-based mix, using Subaru Genuine Long Life Coolant or an equivalent that is compatible with aluminum engines and formulated for low silicate, low phosphate formulations.
The exact specification can vary slightly by model year, so always check the owner’s manual or consult a Subaru dealer for your specific Forester. In general, don’t use straight concentrate without dilution, don’t mix incompatible coolant types, and avoid GM Dex-Cool or other formulas not labeled as Subaru-compatible.
Compatible coolant options for Subaru Forester
Below are commonly accepted options for Forester cooling systems. Choose a product that clearly states Subaru compatibility or equivalence to the required aluminum-engine coolant standard, and ensure it is a premixed 50/50 formulation unless your manual specifies otherwise.
- Subaru Genuine Long Life Coolant (50/50 premixed)
- Certified HOAT or OAT coolants that are low-silicate, phosphate-free, and explicitly listed as compatible with Subaru engines or aluminum cooling systems
- Other manufacturer coolants that are specifically labeled as Subaru-compatible or suitable for aluminum engines and 50/50 premixed use
Note: Color alone is not a reliable indicator of compatibility. Always verify that the product meets Subaru’s specifications and is appropriate for aluminum engine components.
How to add or replace coolant in a Forester
Before starting any cooling system work, ensure the engine is completely cool and the vehicle is on a level surface. The following steps outline a general procedure; refer to the owner’s manual for model-year-specific bleeding procedures or nuances.
- Park on level ground, set the parking brake, and wait for the engine to cool completely.
- Place a drain pan beneath the cooling system drain plug or radiator, if accessible, and carefully relieve any pressure before opening the system.
- Drain the old coolant from the radiator or reservoir as applicable, then close the drain plug once drainage is complete.
- Fill the system with a 50/50 premixed coolant, or with the correct ratio if using concentrate, adding distilled water as needed to reach the proper level.
- Some Forester models require bleeding of air from the cooling system—follow the manual’s instructions to bleed if needed, then start the engine and bring to operating temperature to allow air to escape.
- Recheck the coolant level when the engine cools again and top off to the recommended mark. Dispose of old coolant and any waste materials according to local regulations.
Conclusion: After refilling, run the engine to operating temperature, check for leaks, and recheck the level once the engine cools. Use a 50/50 premixed coolant unless the manual specifies a different ratio, and ensure you are using a coolant approved for aluminum engines to protect the cooling system components.
Maintenance and safety tips
Regular cooling-system maintenance helps prevent overheating and corrosion. Periodically inspect hoses for wear, keep the coolant level between the Min and Max marks when cold, and follow Subaru’s recommended service intervals for coolant flushes (often every several years or as specified in your owner’s manual). If you notice overheating, a sweet smell, or visible leaks, have the system inspected promptly by a qualified technician.
Summary
Bottom line: For a Subaru Forester, use a 50/50 ethylene glycol–based coolant, preferably Subaru Genuine Long Life Coolant or another product clearly labeled as Subaru-compatible and suitable for aluminum engines. Always check the model-year manual for exact specifications, avoid mixing incompatible coolants, and follow proper replacement and disposal practices to maintain cooling system reliability.
Can I use universal coolant in my Subaru?
Every vehicle manufacturer, including Subaru has developed its own coolant or requires a particular coolant that is unique to explicit years and models.
What color coolant does a Subaru use?
This will hold true in most all Subaru Outbacks, Impreza, Forester, Legacy and WRX models. If you own a 1999 to 2008 SOHC 2.5l you should use the O.E. Subaru Long Life Coolant that is green in color pictured below.
What coolant is used in a Subaru Forester?
Subaru Forester Super Coolant 50/50 PREDILUTED Antifreeze - SOA868V9270 - Genuine Subaru Part.
Do Subaru's need special coolant?
Every vehicle manufacturer, including Subaru has developed its own coolant or requires a specific coolant that is unique to individual years and models. There are many colors of coolants to help distinguish each including blue, purple yellow, green, red, and orange.