Short answer
The 2008-2010 6.4L Power Stroke was the first Power Stroke with a DPF and active regeneration. Specialist sources list radiator leaks, DPF problems and fuel dilution of the engine oil during regeneration among its best-known issues.
Safety first. Diesel injection systems run at extremely high pressure; a pinhole leak can inject fuel through skin. Exhaust and turbo parts stay very hot long after shutdown. Never open a hot cooling system. If you are unsure, stop and see a qualified diesel technician.
Start with the easy checks
- Inspect the radiator for weeping at the seams and keep coolant topped up.
- Check the oil level often; a rising level can mean fuel dilution.
- Avoid lots of idling and short trips that interrupt regens.
Likely causes, most common first
- Radiator leaks
- Commonly reported.
- DPF loading and regeneration problems
- Duty cycle and upstream faults.
- Fuel dilution
- From regeneration fueling.
These are common causes, not a diagnosis. The same symptom can have a different cause on your engine; codes, tests and your service information decide.
When to stop and see a diesel tech
- Overheating or coolant loss.
- DPF warnings that do not clear.
Questions
Does the 6.4 Power Stroke have a DPF?
Yes. It was the first Power Stroke to use a diesel particulate filter with active regeneration.
Related symptoms
Emissions
What is DPF regeneration and why does my truck keep doing it?
Troubleshoot →Fuel systemWhy is my diesel oil level rising, and does it smell like fuel?
Troubleshoot →CoolingMy diesel is losing coolant with no visible leak. Why?
Troubleshoot →Where this comes from
- Wikipedia: Ford Power Stroke engine
- Diesel World: 6.4L Power Stroke failures
- DieselHub: Common 6.4L Power Stroke problems
Last reviewed 2026-10-19. General information only: confirm with your service information and a qualified diesel technician.