2023 Ford F-350 Super Duty Coolant Capacity & Type

The 2023 Ford F-350 Super Duty holds approximately 28.5 to 30 quarts (27 to 28.4 liters) of coolant, depending on the engine. This guide provides comprehensive information on coolant capacity, type, maintenance, and common issues for your F-350.

Quick Answer

• Total Cooling System Capacity:
  • 6.7L Power Stroke Diesel: ~30 quarts (28.4 liters)
  • 7.3L Godzilla Gas: ~28.5 quarts (27 liters)
• OEM Coolant Specification: Ford Yellow Antifreeze/Coolant, meeting Ford Specification WSS-M97B57-A2 (P-OAT - Phosphated Organic Acid Technology)
• Mix Ratio: 50/50 pre-mix or concentrated coolant mixed with distilled water

Capacity by Engine Option

Flush Interval

The recommended coolant flush interval for the 2023 Ford F-350 Super Duty is typically around 100,000 miles or 6 years under normal driving conditions. For severe duty applications (e.g., heavy towing, frequent off-road use, extreme temperatures), it is advisable to reduce this interval to 50,000 miles or 3 years to ensure optimal cooling system performance and longevity.

How to Refill & Bleed

Refilling and bleeding the cooling system on your 2023 Ford F-350 Super Duty is crucial to prevent air pockets that can lead to overheating. Always perform this on a cool engine.

1. Drain: Completely drain the old coolant from the radiator and engine block. Dispose of used coolant responsibly.
2. Flush (Optional but Recommended): Use a cooling system flush product and distilled water to clean the system thoroughly.
3. Refill: Close all drain plugs. Slowly fill the degas bottle (coolant reservoir) with the specified Ford Yellow Antifreeze/Coolant (WSS-M97B57-A2) 50/50 mix. Fill until the level is between the "MIN" and "MAX" marks.
4. Bleed Air - Gas Engines (7.3L Godzilla): Start the engine with the heater on high (fan speed low). Allow the engine to reach operating temperature. As the engine warms up, air pockets will escape through the degas bottle. Gently squeeze the upper and lower radiator hoses to help dislodge air. Monitor the coolant level and top off as needed. Some 7.3L engines may have a bleeder screw near the thermostat housing; if present, open it slightly until a steady stream of coolant emerges, then close it.
5. Bleed Air - Diesel Engines (6.7L Power Stroke): The 6.7L Power Stroke often uses a self-bleeding design, but it's still essential to monitor the degas bottle. After filling, run the engine with the heater on high. Drive the vehicle for a short period, then let it cool completely. Recheck the coolant level in the degas bottle and top off as necessary. Repeat this cycle a few times until the level stabilizes.
6. Final Check: After the engine has cooled, ensure the coolant level is correct. Regularly check the level for the next few days to catch any remaining air pockets.

Common Cooling System Issues for this Generation (2020-Present Ford F-Series Super Duty)

While robust, the 2020-present Ford F-Series Super Duty (including the 2023 F-350) can experience some cooling system issues, especially with demanding use:

• Coolant Leaks: Hoses, radiator, and water pump seals can eventually develop leaks. Inspect regularly for drips or low coolant levels without an apparent cause.
• Degas Bottle Cracks: The plastic degas (coolant reservoir) bottle can develop cracks over time, leading to coolant loss. This is a common failure point across many Ford vehicles.
• Water Pump Failure: The water pump, like any mechanical component, has a finite lifespan. Symptoms include a whining noise, coolant leaks from the pump, or engine overheating.
• Radiator Blockage/Fin Damage: Debris can accumulate in the radiator fins, reducing cooling efficiency. Damage from road hazards can also compromise the radiator.
• Thermostat Issues: A stuck-open thermostat can cause the engine to run too cool (affecting efficiency and emissions), while a stuck-closed thermostat will lead to overheating.
• EGR Cooler Issues (6.7L Power Stroke Diesel): The exhaust gas recirculation (EGR) cooler on the diesel engine can be a source of coolant consumption or leaks if it fails internally.

Regular maintenance and using the correct Ford-specified coolant are vital in preventing these issues and ensuring the longevity of your F-350's cooling system.

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