2020 Toyota Tundra Coolant Capacity & Type

Your 2020 Toyota Tundra has a total cooling system capacity of approximately 11.2 to 14.9 quarts (10.6 to 14.1 liters), depending on engine and equipment.

Quick Answer

• Total Capacity: 11.2 - 14.9 qts (10.6 - 14.1 L)
• OEM Coolant Spec: Toyota Super Long Life Coolant (SLLC), Pink, HOAT (Hybrid Organic Acid Technology)
• Mix Ratio: 50/50 with distilled water (pre-mixed is recommended)

Capacity by Engine Option

The 2020 Tundra was offered with two engines which have slightly different cooling system capacities.

Note: The 5.7L V8 capacity can vary depending on whether the truck is equipped with the optional tow package, which includes an additional transmission fluid cooler that is integrated with the cooling system.

Flush Interval

Toyota's Super Long Life Coolant is designed for extended service intervals.

• Normal Service: The initial factory fill is good for 10 years or 100,000 miles. After the first replacement, the interval is reduced to every 5 years or 50,000 miles.
• Severe Duty: If you frequently tow heavy loads, drive in extreme temperatures, or operate in dusty/dirty conditions, it is advisable to inspect the coolant more frequently and consider a flush closer to the 60,000-mile mark as a preventative measure.

How to Refill & Bleed

Properly refilling and bleeding the air from the cooling system is critical to prevent overheating. While a vacuum-fill tool is the professional standard, you can bleed the system manually.

1. Mix Coolant: If using concentrate, mix it 50/50 with distilled water in a clean container. Do not use tap water.
2. Fill Slowly: With the engine off and cool, slowly pour the coolant into the radiator and the overflow reservoir. On the 5.7L V8, there is a plastic air bleed plug on top of the thermostat housing. It is highly recommended to open this plug while filling to allow trapped air to escape.
3. Bleed Air: Once full, loosely reinstall the radiator cap. Start the engine and let it warm up with the heater on high. You will see air bubbles coming out of the radiator neck. As the level drops, add more coolant.
4. Seal and Monitor: Once the bubbling stops and the engine reaches operating temperature (the upper radiator hose will be hot), top off the coolant and securely install the cap. Check the coolant level in the overflow tank after the first few drives and top off as needed.

Common Cooling System Issues

The second-generation Tundra (2007-2021) is known for its reliability, but some cooling system issues can arise, particularly on higher-mileage trucks:

• Water Pump Failure: The most common issue is a leaking water pump. Signs include a slow coolant drip from the front of the engine (often leaving pink, crusty residue) and a grinding or whining noise. This is a known failure point, sometimes occurring as early as 60,000 miles, but more commonly after 100,000 miles.
• Thermostat Issues: A stuck thermostat can cause the engine to either overheat or fail to reach operating temperature, resulting in poor performance and fuel economy.
• Radiator Leaks: Leaks can develop in the plastic end tanks or the aluminum core of the radiator over time due to age and vibration.

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