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How many gallons of antifreeze are needed for 04 ford f 350 6.0 diesel?

The 2004 Ford F-350 6.0L Powerstroke diesel engine's cooling system capacity is approximately 15-16 quarts. Since there are 4 quarts in a gallon, you'll need between 3.75 and 4 gallons of antifreeze/coolant.

However, it's crucial to check your owner's manual. The exact amount may vary slightly, and the manual will provide the most accurate figure for your specific truck. Also, you should always consider using a 50/50 mix of antifreeze and distilled water unless your climate requires a different ratio. Using only straight antifreeze isn't recommended.