2020 Subaru Forester Coolant Type – The Essential Guide To Protecting
For your 2020 Subaru Forester, the correct coolant is Subaru Super Coolant, a distinctive blue, long-life formula based on Phosphated Hybrid Organic Acid Technology (P-HOAT). Using this specific coolant is crucial for preventing corrosion, maintaining optimal engine temperature, and ensuring the longevity of your cooling system components. This guide provides all the necessary details for proper maintenance.
Keeping your Subaru Forester running smoothly and reliably is a top priority, whether you’re commuting to work or tackling a weekend off-road adventure. One often-overlooked but absolutely critical aspect of engine health is using the correct engine coolant. Putting the wrong fluid in can lead to costly damage down the line.
This comprehensive guide will cut through the confusion and tell you exactly what you need to know about the 2020 Subaru Forester coolant type. We’ll cover everything from identifying the right fluid to proper maintenance steps and common issues. By the end, you’ll be equipped with the expert knowledge to keep your Forester’s cooling system in prime condition.
Understanding the 2020 Subaru Forester Coolant Type
The heart of your 2020 Subaru Forester’s cooling system relies on a very specific fluid: Subaru Super Coolant. This isn’t just any antifreeze; it’s a specially formulated, long-life coolant designed to work perfectly with Subaru’s unique Boxer engine architecture and cooling system materials.
It’s easily identifiable by its distinct blue color.
The Importance of Subaru Super Coolant
Subaru Super Coolant is engineered with a Phosphated Hybrid Organic Acid Technology (P-HOAT) formula. This advanced chemistry provides superior protection against corrosion and rust, which is vital for the aluminum components found throughout your Forester’s engine and radiator.
Using the wrong coolant, even for a top-off, can lead to chemical incompatibilities. This can cause gelling, premature wear of seals, and accelerated corrosion, potentially damaging your water pump or radiator. Always stick with the recommended type to avoid these issues.
Why the Right Coolant Matters for Your Boxer Engine
Your Subaru Boxer engine runs efficiently, but like any internal combustion engine, it generates a lot of heat. The cooling system’s job is to dissipate this heat, preventing overheating and maintaining a consistent operating temperature. The coolant is the lifeblood of this system.
Protecting Against Overheating and Freezing
Coolant performs two primary functions: it raises the boiling point of water to prevent overheating in hot conditions and lowers its freezing point to protect the engine block from cracking in cold weather. The specific additives in Subaru Super Coolant ensure optimal performance across a wide range of temperatures.
Proper coolant levels and the correct type are especially critical if you’re venturing into extreme conditions, such as high desert trails in summer or snowy mountain passes in winter. An off-road excursion with an underperforming cooling system can quickly turn into a roadside emergency.
Preventing Corrosion and Component Wear
Beyond temperature regulation, the right coolant provides essential corrosion protection. The P-HOAT inhibitors in the 2020 Subaru Forester coolant type prevent rust and scale buildup on internal passages, radiator fins, and the water pump impeller. This helps maintain efficient heat transfer and prolongs the lifespan of expensive cooling system components.
Using a generic green or orange coolant in your Forester can strip away these protective layers, leading to premature failure of your radiator, heater core, and even your engine’s head gaskets – a known weak point in some older Subaru models.
Identifying Subaru Super Coolant: Color, Type, and Specifications
Knowing exactly what to look for is the first step in proper coolant maintenance. Subaru has made it relatively straightforward by standardizing their long-life coolant.
The Distinctive Blue Color
The most immediate identifier for the correct 2020 Subaru Forester coolant type is its color: it is a vibrant blue. If you see green, orange, pink, or yellow coolant in your reservoir, it’s a strong indication that the wrong fluid may have been used at some point, and a flush might be necessary.
Always verify the color against your owner’s manual or the label on a new bottle of Subaru Super Coolant. This visual check is a quick way to assess if your cooling system contains the proper fluid.
Subaru Super Coolant (SLLC) Specifications
Subaru Super Coolant is typically referred to as Super Long Life Coolant (SLLC). It’s an ethylene glycol-based solution mixed with de-ionized water, containing the specific P-HOAT corrosion inhibitors. It comes pre-mixed, usually in a 50/50 ratio, ready for use without adding water.
When purchasing, look for bottles clearly labeled “Subaru Super Coolant” or “Subaru Long Life Coolant” with the blue color designation. Part numbers may vary slightly by region, but the key is the Subaru branding and the blue color.
Checking and Topping Off Your Forester’s Coolant
Regularly checking your coolant level is a simple, yet vital, maintenance task that any car owner or DIYer can perform. It helps catch potential issues early.
Safety First: Always Work on a Cold Engine
Before you even think about opening the radiator cap or coolant reservoir, ensure your engine is completely cold. Opening a hot cooling system can release pressurized, scalding hot fluid, causing severe burns. Allow your Forester to cool down for several hours, or check it first thing in the morning.
Always wear safety glasses and gloves when working with automotive fluids. Keep a few shop towels handy for any spills.
Locating and Inspecting the Coolant Reservoir
The coolant reservoir (also known as the overflow tank) is a semi-transparent plastic bottle usually located on one side of the engine bay, often near the radiator. It will have “FULL” and “LOW” or “MIN” and “MAX” markings on the side.
With the engine cold, the coolant level should be between these two marks. If it’s below the “LOW” mark, it’s time to top it off. The color should be blue and clear, not murky or rusty.
Adding Coolant to Your 2020 Subaru Forester
If your coolant level is low, carefully unscrew the cap from the coolant reservoir. Slowly pour in Subaru Super Coolant (blue) until the level reaches the “FULL” or “MAX” line. Do not overfill.
If you only need a small amount for a top-off and are absolutely certain you have the correct blue coolant already, you can use distilled water in an emergency. However, it’s always best to use the proper pre-mixed Subaru Super Coolant to maintain the correct concentration of inhibitors and antifreeze properties.
Performing a Coolant Flush: When and How for Your 2020 Forester
While the 2020 Subaru Forester coolant type is designed for long life, it’s not eternal. Over time, its protective additives deplete, and contaminants can build up.
Subaru’s Recommended Coolant Change Interval
Subaru recommends a specific service interval for their Super Coolant. For the first change, it’s typically around 137,500 miles or 11 years, whichever comes first. Subsequent changes are then recommended every 75,000 miles or 6 years. Always consult your owner’s manual for the most accurate and up-to-date schedule for your specific model year.
Sticking to this schedule is crucial for maintaining the integrity of your cooling system and preventing premature component failure. This is especially true if your Forester sees a lot of towing, off-road driving, or experiences extreme temperatures.
DIY Coolant Flush Steps (Advanced DIYers)
Performing a full coolant flush is a more involved task, usually best left to experienced DIYers or a professional mechanic. If you choose to do it yourself, ensure you have the right tools and knowledge.
- Gather Supplies: You’ll need several gallons of new Subaru Super Coolant, distilled water (if flushing with water), a drain pan, a funnel, basic hand tools, safety glasses, and gloves.
- Access the Drain: With the engine cold, place your drain pan under the radiator drain plug. This is usually a plastic petcock at the bottom of the radiator.
- Drain the Old Coolant: Carefully open the drain plug and the radiator cap (only when cold!) to allow the old coolant to drain completely.
- Flush with Distilled Water (Optional but Recommended): Once drained, close the drain plug. Fill the system with distilled water. Run the engine with the heater on high until it reaches operating temperature. Drain the water. Repeat this process until the drained water runs clear, indicating all old coolant and contaminants are removed.
- Refill with New Coolant: Close the drain plug. Fill the system slowly with the new Subaru Super Coolant (blue) through the radiator cap opening. Fill the overflow reservoir to the “FULL” line.
- Bleed Air from the System: This is a critical step for Subaru Boxer engines. Start the engine with the radiator cap off (or loosely on, depending on the model’s bleed procedure). Allow it to warm up. Squeeze the upper and lower radiator hoses repeatedly to help release air pockets. You may see bubbles come up through the radiator opening. Continue to top off as needed. Once the thermostat opens and the fluid level stabilizes, replace the radiator cap.
- Final Check: Drive the vehicle, monitoring the temperature gauge. After it cools down, check the coolant level in the reservoir and top off if necessary.
If you’re unsure at any point, it’s always safer to consult a certified Subaru technician.
Common Coolant System Issues and Troubleshooting
Even with proper maintenance, issues can arise. Knowing what to look for can help you diagnose problems early.
Low Coolant Level and Leaks
A consistently low coolant level usually points to a leak. Check around the radiator, hoses, water pump, and engine block for drips or stains. Common leak points include hose clamps, the radiator itself, or the reservoir. A sweet smell can also indicate a coolant leak.
If you suspect a leak, a cooling system pressure tester can help pinpoint the exact location. This tool pressurizes the system while the engine is cold, making leaks more visible.
Overheating and Temperature Gauge Spikes
If your temperature gauge consistently reads high or spikes, it’s a serious warning sign. Pull over immediately and let the engine cool down. Do not continue driving an overheating vehicle, as it can cause catastrophic engine damage, including a blown head gasket.
Causes of overheating can include low coolant, a faulty thermostat, a failing water pump, a clogged radiator, or even a damaged cooling fan. A professional diagnosis is recommended if you can’t identify the cause.
Contaminated or Discolored Coolant
If your blue coolant turns brown, rusty, or oily, it indicates contamination. Brown or rusty coolant suggests corrosion or old, depleted fluid. Oily coolant often points to an internal engine issue, such as a leaking head gasket or a cracked block, allowing oil to mix with the coolant.
In these cases, a simple drain and refill won’t suffice. The system will need a thorough flush, and the underlying mechanical issue must be addressed by a qualified mechanic.
Coolant Safety and Environmental Considerations
Coolant is a toxic substance and requires careful handling and disposal.
Handling Coolant Safely
Always keep new and used coolant out of reach of children and pets. Its sweet smell can attract animals, but ingestion can be fatal. When working with coolant, ensure good ventilation, and avoid skin contact by wearing gloves.
If coolant gets on your skin, wash it thoroughly with soap and water. In case of ingestion, seek immediate medical attention.
Proper Disposal of Used Coolant
Never pour used coolant down the drain or onto the ground. It is harmful to the environment and can contaminate water sources. Many auto parts stores, service centers, or municipal waste facilities offer coolant recycling or disposal services.
Collect used coolant in a sealed, labeled container and take it to an approved facility for safe disposal. This is a critical step in responsible DIY automotive maintenance.
Frequently Asked Questions About 2020 Subaru Forester Coolant
Here are some common questions regarding the coolant for your Forester.
Can I use universal “all makes, all models” coolant in my 2020 Subaru Forester?
No, it is strongly advised against using universal coolants. While some claim compatibility, they often lack the specific P-HOAT inhibitors and chemical balance required for Subaru’s cooling system materials. Sticking to genuine Subaru Super Coolant (blue) is essential for long-term engine health and warranty compliance.
What happens if I mix different types of coolant in my Forester?
Mixing different coolant types, especially those with different chemical technologies (like OAT, HOAT, P-HOAT, IAT), can lead to adverse reactions. These can include gelling, precipitation of solids, premature corrosion, and damage to seals and gaskets. This can severely compromise your cooling system’s effectiveness and lead to expensive repairs.
How often should I check my coolant level?
It’s a good practice to check your coolant level at least once a month, or before any long road trips or challenging driving conditions (like off-roading). This quick check can help you catch leaks or low levels before they become major problems.
Is it normal for the coolant level to drop slightly over time?
A very slight, gradual drop in coolant level over many months can be normal due to evaporation or minor pressure changes. However, if you notice a significant or rapid drop, it almost always indicates a leak that needs to be investigated and repaired promptly.
Can I just add water if my coolant is low?
While distilled water can be used for a very small top-off in an emergency, it’s not a long-term solution. Adding too much water dilutes the antifreeze and anti-corrosion properties of the coolant, reducing its effectiveness. Always use the specified Subaru Super Coolant for proper maintenance.
Your 2020 Subaru Forester is a robust and reliable vehicle, and maintaining its cooling system with the correct Subaru Super Coolant (blue) is fundamental to its longevity. By understanding the importance of the specific coolant type, regularly checking levels, and adhering to maintenance schedules, you’re investing in your vehicle’s performance and preventing costly issues.
Remember, when in doubt, consult your owner’s manual or a trusted Subaru mechanic. Taking proactive steps now will ensure your Forester continues to deliver dependable performance for years to come, whether you’re on the asphalt or exploring rugged trails. Stay safe and keep exploring!
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