What kind of coolant does a 2015 Ford 6.7 take?
The 2015 Ford 6.7L Power Stroke uses Motorcraft Gold Engine Coolant, an ethylene glycol-based long-life coolant that meets Ford’s WSS-M97B44-D specification. You can use it as a 50/50 premixed solution or as concentrate mixed with distilled water to achieve that same ratio.
In detail, diesel engines like the 6.7 require a coolant that is compatible with Ford’s cooling system materials and formulation. Using the wrong type can lead to cooling performance issues or damage over time, so sticking with Ford-approved options is important for reliability and warranty considerations.
Official coolant recommendations
To keep the 6.7 Power Stroke cooling system performing properly, Ford-approved options are recommended. The following are commonly used and officially supported choices.
- Motorcraft Gold Engine Coolant, 50/50 Premixed — Ready to pour, meets Ford WSS-M97B44-D.
- Motorcraft Gold Engine Coolant Concentrate — Must be mixed with distilled water to achieve a 50/50 premix; meets Ford WSS-M97B44-D.
- Any coolant that explicitly states compatibility with Ford WSS-M97B44-D or the equivalent Ford specification, and is silicate- and phosphate-free (OAT/Hybrid OAT formulations), can be used when Ford-approved variants are not available.
Using a coolant that does not meet Ford’s specification or that contains silicates/phosphates not approved for this engine can lead to corrosion, deposits, or cooling system damage.
How to use the coolant correctly
Understanding how to apply these coolants ensures proper protection and performance. Here are the key guidelines for the 6.7 Power Stroke.
Mixing and top-up guidelines
Choose either the premixed 50/50 version or the concentrate and mix with distilled water to reach a 50/50 mix. Do not use tap water unless it is distilled, and avoid mixing with non-approved coolants. Follow the exact concentrate-to-water ratio specified by Motorcraft on the product label to maintain the intended protection level.
When to replace or top up
Coolant should be checked regularly for level and contamination, and replaced per Ford’s service intervals or if the system shows signs of leaks, overheating, or discoloration. A full flush is typically recommended only when following Ford service guidelines or after replacing significant cooling-system components.
Notes on compatibility and safety
Stick to Ford-approved formulations or those explicitly listed as compatible with Ford’s WSS-M97B44-D specification. Mixing different coolant types or using non-approved brands can compromise corrosion protection and cooling efficiency, especially in a high-heat diesel application like the 6.7 Power Stroke.
Summary
The 2015 Ford 6.7 Power Stroke uses Motorcraft Gold Engine Coolant, either as a 50/50 premix or as concentrate blended with distilled water to reach 50/50. It should meet Ford specification WSS-M97B44-D and be silicate- and phosphate-free (an OAT formulation). For best results, choose Motorcraft products or other coolants clearly labeled as Ford-approved for this specification, and follow mixing and maintenance guidelines to protect the cooling system.
