What is Subaru super coolant made of?

Subaru Super Coolant is an ethylene glycol–based long-life antifreeze formulated for Subaru engines; the exact proprietary formulation is not publicly published by Subaru.

In general terms, it contains a glycol base fluid to provide freeze and boil protection, a corrosion-inhibitor package to protect metal surfaces used in Subaru cooling systems (notably aluminum alloys), and a dye to distinguish Subaru coolant from other fluids. It is designed to meet Subaru’s specifications and to deliver extended service life under normal driving conditions.

Composition in broad terms

Because the exact mixture is proprietary, Subaru does not disclose a full ingredient list. Here is what is typically present in Subaru's coolant family and modern OEM formulations like it:

• Base fluid: Ethylene glycol–based antifreeze that lowers the freezing point and raises the boiling point of the coolant.


• Corrosion inhibitors: A package designed to protect metal surfaces in the cooling system, including aluminum and other common substrates; the exact chemical components (silicates, phosphates, borates, organic inhibitors, etc.) are not publicly specified by Subaru.


• Dye/color: A blue or distinctive dye to help identify Subaru coolant and distinguish it from other automotive fluids.


• Water balance or premixed form: Coolant is supplied as a concentrate or premixed solution to achieve the proper glycol concentration.

For vehicle owners and technicians, the practical takeaway is to use Subaru Genuine Long Life Coolant or Subaru Super Coolant that meets Subaru’s specification, and to avoid mixing different coolant types. The proprietary nature of the exact formula means enthusiasts cannot rely on a public ingredient list with precise chemical names and proportions.

Practical considerations for owners

Compatibility and maintenance

Always consult the owner's manual or a Subaru dealership for the exact coolant specification recommended for your model and region. Use only Subaru-approved coolant to maintain warranty coverage and ensure proper corrosion protection for aluminum engines and cooling components.

Do not mix types or brands unless explicitly approved, as incompatible coolant chemistries can reduce corrosion protection and cooling performance.

Summary

Subaru Super Coolant is an ethylene glycol–based long-life antifreeze with a proprietary corrosion-inhibitor package tailored for Subaru engines. The precise composition is not publicly disclosed, but it is designed to protect aluminum cooling components and provide long service life when used as directed with Subaru's recommended coolant products.

Do subarus take a special antifreeze?

Yes, Subarus need a specific coolant, primarily the factory-filled "Super Coolant," which is a special blue Subaru coolant. Before 2008, Subarus used a long-life green coolant. While a high-quality universal Asian blue coolant can be used, it's crucial to use the correct type for your specific Subaru model and year to ensure proper corrosion protection, especially for its aluminum engine components.
 
Coolant types and considerations

• Blue Subaru Super Coolant: This is the current standard, introduced after 2008, and is a premixed, long-life formula designed specifically for Subaru's aluminum engines. It has a much longer service interval than older coolants. 
• Green Subaru Long Life Coolant: This was used in Subarus before 2008. It is an ethylene glycol-based coolant that is not premixed and requires mixing with water to the correct ratio, which can be more challenging to get right. 
• Universal Asian Blue Coolant: A high-quality universal Asian blue coolant can be used as a substitute for Subaru's blue Super Coolant. This coolant is also designed to protect aluminum engines and can be a good option if you can't get the Subaru-brand product. 

Important tips

• Always check your owner's manual: The most accurate information for your specific Subaru model will be in your owner's manual. 
• Don't mix coolants: Never mix green and blue coolant, as they are not formulated to be compatible with each other. 
• Consider the warranty: If your car is still under warranty, using the specified Subaru coolant is recommended to avoid voiding the warranty. 
• Don't use universal coolants indiscriminately: While some universal coolants may work, it's crucial to ensure the universal coolant is specifically formulated for Asian vehicles to protect against corrosion and other damage. 

How long does Subaru Super Coolant last?

Subaru Super Coolant is designed to last for 11 years or 137,500 miles as the initial replacement interval. After the first replacement, Subaru recommends replacing it more frequently, typically every 6 years or 75,000 miles. 
Initial interval

• The original Subaru Super Coolant (blue) is a long-life formula that doesn't require replacement for 11 years or 137,500 miles, whichever comes first. 
• For models using the older green coolant, the recommended interval is significantly shorter, around 30,000 miles or two years. 

Subsequent intervals

• Once the initial period has passed, the coolant should be changed more regularly to maintain optimal performance and protection.
• The recommended interval for subsequent changes is every 6 years or 75,000 miles. 

Factors that may require earlier replacement

• Driving conditions: In some cases, such as towing or extreme climates, a more frequent flush may be beneficial. 
• Signs of a problem: If you notice any of the following signs, have the coolant inspected and potentially flushed sooner: 
  • Coolant leaks 
  • Overheating 
  • An unusual burning odor 
  • Sediment or rust in the coolant 

Is Supertech a good coolant brand?

This is a Great Value in Antifreeze / Coolant for the money. Protects 10 years / 150,000 miles without the excessive cost of "name brand" coolants / antifreeze. Be sure to save an empty jug to pour 1/2 into and mix with 1/2 gallon of distilled water for TWO jugs of 50/50 coolant. Runs well and a GREAT value vs.

Is Subaru super coolant worth the price?

It's not a scam. The blue coolant has a particular formulation of corrosive inhibitors your typical “green” coolant doesn't have. Considering how long the coolant lasts, $30 for proper protection and piece of mind is well worth it. Curran Lafferty Subaru sells both blue and green coolant.