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What coolant do I use for a Ford 2004 6.0 diesel?

The 2004 Ford 6.0L Power Stroke diesel requires Ford Motorcraft Gold coolant or an equivalent heavy-duty coolant that meets the Ford specification WSS-M97B44-D. This is a crucial point; don't use just any coolant. Using the wrong type can lead to serious engine damage, including catastrophic failure of the engine's aluminum components.

Crucially, this is not a standard "green" coolant. It's a specific type designed to handle the high temperatures and pressures of the 6.0L Power Stroke and is formulated to prevent corrosion in the aluminum components.

Always check your owner's manual for the definitive recommendation, but the information above is a reliable guideline. If you're unsure, consult a Ford dealership or a trusted mechanic specializing in Ford diesel engines.