Maintaining Your 2011 Subaru Legacy: The Ultimate Guide to the Best Coolant for Optimal Engine Performance

As a Subaru Legacy owner, you know how important it is to take care of your car’s engine and cooling system to achieve optimal performance. One essential aspect of engine maintenance is maintaining the right type of coolant. In this article, we will provide you with everything you need to know about the kind of coolant for your 2011 Subaru Legacy, including its definition, the types of coolant available, and Subaru’s recommended coolant for your car.

Understanding Engine Cooling Systems

Before delving into the type of coolant your 2011 Subaru Legacy requires, it’s essential to understand how engine cooling systems function. The coolant in your car’s engine works to absorb heat generated by the engine, regulate the operating temperature, and prevent the engine from overheating. The coolant circulates continuously through the engine, radiator, and hoses, effectively removing heat as it passes through the engine components.

Types of Coolant Available

Various types of engine coolant are available in the market, each with its unique composition, properties, and benefits. The most common types include ethylene glycol-based coolants, propylene glycol-based coolants, and hybrid organic acid technology coolants (HOAT).

See also  How to Replace a Catalytic Converter on Your 2007 Subaru Legacy: A DIY Guide

Ethylene glycol-based coolants are the most widely used and typically have a long life span. However, they contain toxic compounds, making them harmful to humans and animals if ingested. Propylene glycol-based coolants are a safer alternative as they are less harmful and are more environmentally friendly. HOAT coolants are a combination of both ethylene and propylene glycol and are often recommended for newer car models.

Subaru Recommended Coolant

For your 2011 Subaru Legacy, the recommended engine coolant is the Subaru Super Coolant. This is a blue-colored, ethylene glycol-based coolant that is specially formulated for Subaru vehicles. It includes anti-corrosion properties that prevent damage to engine parts, provide extended engine life, and improve engine performance.

Benefits of Using the Recommended Coolant

Using the Subaru Super Coolant comes with several benefits, including:

  • Reduces engine wear and tear
  • Prevents overheating
  • Maintains correct engine temperature
  • Enhances engine performance and efficiency
  • Provides anti-corrosion protection

Steps to Follow When Changing Coolant

Changing coolant is a relatively straightforward process, and following the correct steps ensures that your engine runs smoothly. Here are the steps you should follow when changing coolant in your 2011 Subaru Legacy:

  1. Make sure the engine is cool and that you have the right coolant for your car.
  2. Drain the old coolant from the radiator and engine block.
  3. Refit the drain plug and flush the system with water.
  4. Refill the system with Subaru Super Coolant or the recommended coolant.
  5. Run the engine with the heater on high for at least 10 minutes to circulate the coolant through the system.
  6. Check the coolant level and top up if necessary.
See also  Subaru Legacy 93 Engine: How Many Coolant Temperature Sensors Does It Need?

Potential Risks and Consequences of Using the Wrong Coolant

Using the wrong coolant in your 2011 Subaru Legacy can cause several damages, including engine overheating, corrosion of engine parts, and reduced engine performance. Moreover, using the wrong coolant can void your car’s warranty, which can be costly in case of any repairs.


Q: What happens if I mix different types of coolant?

A: Mixing different types of coolant can cause engine damage, resulting in costly repairs. Always ensure you use the recommended coolant for your Subaru Legacy.

Q: How often should I change my coolant?

A: Subaru recommends changing your engine coolant every 11 years or 137k miles, whichever comes first. However, it’s essential to change your coolant every 5 years or 60k miles to maintain optimal performance.

Q: Is it okay to use a universal coolant in my 2011 Subaru Legacy?

A: Subaru recommends using their Super Coolant, which is specially formulated for their vehicles. However, universal coolants can still be used, provided they meet the required specifications.

In conclusion, maintaining the recommended engine coolant plays a significant role in keeping your 2011 Subaru Legacy running smoothly and efficiently. By using the Subaru Super Coolant and following the correct procedures when changing coolant, you can guarantee optimal engine performance, improved gas mileage, and a longer lifespan for your car.

Avatar photo

Alton Brobst

As a longtime Subaru enthusiast, Alton brings a wealth of knowledge and experience to our blog. From his early days of tinkering with engines to his current role as a certified Subaru technician, Alton has seen it all when it comes to Subarus. When he's not working on cars, he enjoys hiking and exploring the great outdoors.

Recommended Articles