How much coolant 6.9 diesel Ford truck?

The 6.9-liter diesel engine in a Ford truck typically requires about 14 to 15 quarts (approximately 3.5 to 3.8 gallons) of coolant when including the radiator and engine block. It's essential to use a suitable coolant mixture, usually a 50/50 mix of antifreeze and distilled water, to ensure optimal performance and protection against freezing and corrosion. Always check the owner's manual for specific recommendations for your truck model.