Ford 6.4L Power Stroke V8
Horsepower
350 hp
Torque
650 lb-ft
Years produced
2008–2010
Aspiration
Turbocharged (compound variable-geometry, two turbochargers)
- Configuration
- V8, 6.4 L
- Aspiration
- Turbocharged (compound variable-geometry, two turbochargers)
- Builder
- Navistar International
- Designers
- Navistar International
- Years
- 2008–2010
Offered in: Ford Super Duty F-250, Ford Super Duty F-350
The 6.4-liter Power Stroke replaced the 6.0-liter in Super Duty pickups for 2008 and was sold through 2010. Built by Navistar International, which also sold it under the MaxxForce 7 name, it uses two turbochargers in a compound arrangement. It was the first Power Stroke to use a diesel particulate filter, and it also used dual EGR coolers. Pickups were rated at 350 hp and 650 lb-ft, with chassis cabs rated lower. It was replaced by Ford's own 6.7-liter engine for 2011.
What made it successful
It raised Ford's ratings to 350 hp and 650 lb-ft, matching the Dodge Ram's Cummins figures for those years, and it brought the emissions hardware needed for the 2008 rules.
Market position
It was the last Power Stroke built by Navistar, and its short three-year run ended when Ford moved to an engine it designed itself. Sourced comparisons with competitors' ratings beyond the Ram match are not yet included.
Rebuild Potential
Tier CEditorial opinion.
The 6.4L has decent parts and community support, but its design carries several linked failures: EGR cooler, oil cooler, fuel dilution, and the emissions system behind them. Repairs are costly and often affect multiple systems, and it is widely considered one of Ford's least reliable diesels. It is a candidate only for buyers who accept those costs.
Best year ranges
- 2008-2010: All years share one design; no year is clearly better in the sources found.
Known weak points
The EGR cooler can leak internally, letting coolant into the engine and risking hydrolock.
Common fix: Replace the EGR cooler with a quality OEM-style unit and inspect the coolant system.
The oil cooler clogs from coolant breakdown, raising oil temperature and reducing coolant flow to the EGR system.
Common fix: Replace the oil cooler and flush and service the coolant system.
Active particulate-filter regeneration dilutes the engine oil with fuel.
Common fix: Shorten oil-change intervals, monitor oil condition, and repair leaking injectors.
Common upgrade categories
- OEM-style replacement EGR and oil coolers
- Coolant filtration and service
- Injector service or replacement
- Radiator and cooling-system refresh
- Transmission and driveline service parts
This engine is emissions-equipped (EGR, particulate filter and, from 2011 on some engines, DEF/SCR). Keep the emissions equipment the truck was built with; repair or replace it with compliant parts. Removing or defeating it on a vehicle originally equipped with it is illegal under federal law. Rules vary by state (for example California/CARB), so check local law and model-year requirements before modifying.
Sources
- Ford Power Stroke engine (Wikipedia) (accessed 2026-09-18)
- Ford Super Duty (Wikipedia) (accessed 2026-09-18)