2022 Subaru Outback Coolant Capacity & Type

The 2022 Subaru Outback cooling system holds approximately 8.2-8.5 US Quarts (7.8-8.0 Liters) of coolant. This capacity ensures optimal engine temperature regulation and protection against freezing and boiling.

Quick Answer

• Total Cooling System Capacity: 8.2 - 8.5 US Quarts (7.8 - 8.0 Liters)
• OEM Coolant Specification: Subaru Super Coolant (Blue, P-OAT - Phosphated Organic Acid Technology)
• Mix Ratio: 50/50 Pre-mixed (or 50/50 concentrate with distilled water)

Capacity by Engine Option

The coolant capacity for the 2022 Subaru Outback generally remains consistent across its engine options:

• 2.5L H4 (Naturally Aspirated): Approximately 8.2 - 8.5 US Quarts (7.8 - 8.0 Liters)
• 2.4L Turbo H4: Approximately 8.2 - 8.5 US Quarts (7.8 - 8.0 Liters)

Minor variations may occur depending on specific options or accessory installations.

Flush Interval

Maintaining the correct coolant flush interval is crucial for the longevity of your cooling system:

• Normal Duty: Replace the initial fill of Subaru Super Coolant at 137,500 miles or 11 years, whichever comes first. Subsequent replacements are recommended every 75,000 miles or 6 years.
• Severe Duty (e.g., heavy towing, extreme temperatures, dusty conditions): While Subaru does not specify a separate severe duty interval for Super Coolant beyond the initial long-life recommendation, it's generally advisable to inspect coolant condition and consider earlier replacement, particularly if coolant appears discolored or contaminated. Consult your owner's manual for specific severe duty maintenance guidelines.

How to Refill & Bleed

Properly refilling and bleeding the cooling system prevents air pockets that can lead to overheating. Always perform this procedure on a cool engine.

1. Drain Old Coolant: With the engine cool, place a drain pan under the radiator. Open the radiator drain cock (petcock) located at the bottom of the radiator. Remove the radiator cap to allow the system to drain completely.
2. Close Drain & Flush (Optional): Once drained, close the drain cock. For a full flush, you can use distilled water to flush the system until it runs clear, then drain again. Subaru generally recommends against chemical flushes.
3. Refill with New Coolant: Slowly pour the specified Subaru Super Coolant (50/50 pre-mixed) into the radiator. Fill until it reaches the top of the filler neck.
4. Fill Reservoir: Fill the coolant overflow reservoir to the "FULL" mark.
5. Bleed Air:
   • Leave the radiator cap off. Start the engine and let it run with the heater on full blast (hot). This opens the heater core and aids in air bleeding.
   • As the engine warms, the thermostat will open, and the coolant level in the radiator may drop. Continuously top off with coolant to keep the radiator full.
   • Gently squeeze the upper and lower radiator hoses a few times to help dislodge air pockets.
   • Look for bubbles rising to the surface of the coolant in the radiator. Continue running the engine until no more bubbles appear and the cooling fan cycles on and off at least twice.
   • Subaru Specific Tip: Some Outback models may have a small air bleed screw on a hose or thermostat housing; consult your repair manual for its location, if applicable. Opening this screw while filling can help trapped air escape more quickly.
6. Install Cap & Test: Once bleeding is complete and the engine is at operating temperature, install the radiator cap securely. Drive the vehicle and monitor the temperature gauge. Recheck the coolant level in the overflow reservoir after the engine has cooled completely and top off if necessary.

Common Cooling System Issues for this Generation (2020-Present Subaru Outback)

While the 2022 Subaru Outback generally boasts a reliable cooling system, a few issues can arise, particularly as vehicles age:

• Head Gasket Leaks (Less Common in Newer Generations but Still Possible): Although significantly improved over earlier generations, head gasket leaks can still occur. Symptoms include external oil or coolant leaks, overheating, white smoke from the exhaust, or coolant consumption. Subaru's use of long-life coolant and improved gasket designs has reduced the prevalence.
• Radiator Leaks: Radiators can develop leaks over time due to corrosion, stone chips, or manufacturing defects. Keep an eye out for green or blue stains under the vehicle or around the radiator itself.
• Thermostat Failure: A failing thermostat can cause the engine to overheat (if stuck closed) or run too cool (if stuck open). Symptoms include fluctuating temperature gauges or the engine taking a long time to warm up.
• Water Pump Failure: The water pump circulates coolant through the engine. Failure can manifest as a coolant leak from the pump's weep hole, a grinding noise from the front of the engine, or overheating.
• Hose Leaks: Rubber hoses can degrade, crack, or become brittle over time, leading to coolant leaks. Regularly inspect hoses for bulges, cracks, or softness.
• Coolant Expansion Tank Leaks/Cracks: The plastic coolant overflow reservoir can sometimes develop cracks, leading to slow coolant loss.

Regular coolant checks and adherence to the recommended maintenance schedule can help prevent many of these issues.

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