The 6.7L Power Stroke is Ford's in-house diesel and a strong performer, but at 100,000 miles it asks for a thoughtful service, particularly around its high-pressure fuel system and emissions hardware. Getting ahead of the known concerns at 100k keeps the truck reliable and protects its most expensive components. The intervals and items below are typical and vary with towing, fuel quality, and climate, so always confirm against your owner's manual and service data.
Protect the CP4.2 fuel system
The 6.7L Power Stroke uses a Bosch CP4.2 high-pressure fuel pump, which is sensitive to fuel quality and lubricity. Protecting it is the top priority at 100k:
- Change both fuel filters on a strict schedule, never stretching the interval; clean fuel is the CP4.2's best defense.
- Watch for any metal or debris that could indicate pump wear, and keep the water separator drained.
- Consider a quality fuel additive for lubricity where appropriate, and always fuel from clean sources.
- Some owners install a disaster-prevention kit or plan a CP3 conversion; whatever the choice, keeping fuel clean matters most.
Emissions system and fluids
The 6.7L runs a DPF, plus SCR with DEF. At 100k, verify regeneration is completing normally, review soot and ash trends, and check the NOx and exhaust temperature sensors, which are common fault points. Keep DEF topped with quality fluid. On fluids, change the engine oil and filter with the correct spec, flush and refill coolant if it is due, and service the TorqShift transmission, differentials, and transfer case. Because it is a Power Stroke, cold starts use glow plugs, not a grid heater, so test the glow plugs and controller if cold starting is weak.
Wear items and inspections
Round out the 100k service with the components that quietly age:
- Water pump and thermostat, inspected for leaks and correct operation.
- Serpentine belt and tensioner.
- Turbocharger and actuator for smooth response.
- Batteries and cables, since diesels crank hard and run heavy electrical loads.
- Charge-air pipes and boots for boost leaks.
A milestone worth planning
Nothing at 100k means a 6.7L Power Stroke is aging out; these engines run well past it. The milestone is your chance to reset fluids, protect the CP4.2 with clean fuel and fresh filters, verify the emissions system, and catch wear items early. Keep records so later milestones are simple, and fix root causes rather than symptoms.
Frequently asked questions
Why is the CP4.2 pump a concern on the 6.7L Power Stroke?
The CP4.2 is sensitive to fuel quality and lubricity, and a failure can send debris through the fuel system. Clean fuel and strict filter changes are the best protection.
Does the 6.7L Power Stroke use glow plugs or a grid heater?
Glow plugs. Only Cummins uses a grid heater. Test the glow plugs and controller if cold starts are slow.
How often should I change the fuel filters?
Follow your manual, and if anything, change them early. Clean fuel filters are the single best thing you can do for the CP4.2. Need filters or fuel-system parts? Email sales@coredieselparts.com.
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