Everything You Need to Know About Ford 6.7 Coolant Capacity

By Nick Marchenko, PhD

The Ford 6.7L Diesel engine, a powerhouse in the automotive world, requires specific maintenance to keep it in top condition. One critical aspect is the coolant system, which plays a pivotal role in engine temperature regulation.

Engine Coolant: The Lifeblood of Your Engine

The coolant system in the Ford 6.7L Diesel comprises two main loops: the primary high-temperature cooling system loop and the secondary cooling system. Here are the capacities for each:

Primary High-Temperature Cooling System Loop:

• Coolant capacity: 35.1 quarts (33.2 L)
• Coolant additive: 48 fluid ounces (1.41 L)

Secondary Cooling System:

• Coolant capacity: 15.1 quarts (14.3 L)
• Coolant additive: 16.0 fluid ounces (473 ml)

Important Note:

Always use the coolant type originally equipped in your vehicle. Any other type may cause damage.

Engine Oil: Keeping Things Smooth

The engine oil capacity, including the oil filter, is 15.0 quarts (14.2 L). It's crucial to use the right type of oil to ensure the longevity and efficiency of your engine.

Diesel Exhaust Fluid (DEF): For Cleaner Emissions

DEF is essential for reducing emissions and keeping your engine compliant with environmental standards. The DEF capacity is 8 gallons (30.2 L).

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Fuel Tanks: Keeping You on the Road

The Ford 6.7L Diesel comes with various fuel tank options, each with different capacities. It's important to know these, especially for long journeys:

• Dual (Left side): Usable - 61 gallons (230.9 L), Liquid - 65 gallons (246 L)
• Dual (Right side): Usable - 47 gallons (177.9 L), Liquid - 50 gallons (189.2 L)
• Small: Usable - 47 gallons (177.9 L), Liquid - 50 gallons (189.2 L)
• Medium: Usable - 53 gallons (200.6 L), Liquid - 56 gallons (211.9 L)
• Large: Usable - 61 gallons (230.9 L), Liquid - 65 gallons (246 L)

Caution:

Do NOT fill above the 95% liquid capacity.

Other Fluids and Oils: The Unsung Heroes

The Ford 6.7L Diesel requires various other fluids and oils for optimal performance:

• Brake Fluid: Between MIN and MAX on the reservoir.
• Automatic Transmission Fluid: 16.3 quarts (15.4 L).
• Wheel Bearing Oil: Varies depending on the axle.
• Power Steering Fluid: 5.2 quarts (4.9 L) for air brake equipped and 6.1 quarts (5.8 L) for hydraulic brake equipped.
• Windshield Washer Fluid: Fill as required.
• A/C Refrigerant and Compressor Oil: 26.5 ounces (0.75 kg) for refrigerant and 5.1 fluid ounces (150 ml) for compressor oil.

Specifications and Recommendations: Follow to the Letter

Ford provides specific recommendations for each type of fluid or oil, ensuring that your vehicle performs at its best. Always refer to the service guide for detailed specifications.

Conclusion

Understanding the coolant and fluid capacities of your Ford 6.7L Diesel is crucial for maintaining your vehicle's health and longevity. Regular checks and maintenance, using the specified products, will ensure that your engine runs smoothly, efficiently, and environmentally friendly. As I continue my journey in automotive writing, I hope this guide serves as a helpful tool for you.

Nick Marchenko, PhD

Industrial Engineer & Automotive Content Specialist

Nick writes in-depth guides on car clubs, engine specs, vehicle ownership, and modifications, combining engineering knowledge with automotive passion.

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