6.4 Powerstroke Overview

The 6.4L Powerstroke diesel engine was introduced by Ford in 2008 as a replacement for the problematic 6.0L Powerstroke. While it offered improvements in power and emissions control, the 6.4L unfortunately developed its own set of reliability issues. This engine was only used for three model years from 2008 to 2010 before being replaced by the 6.7L Powerstroke.

Years to Avoid

When considering a used Ford Super Duty with the 6.4L Powerstroke, it’s generally recommended to avoid all model years from 2008-2010. However, the 2008 model year is often cited as the most problematic:

  • 2008: First year of production, most prone to issues
  • 2009: Some improvements, but still unreliable
  • 2010: Last year, slightly better but still problematic

Common Problems

The 6.4L Powerstroke is known for several recurring issues:

  • Cracked pistons: A major weak point, often leading to catastrophic engine failure
  • Radiator leaks: Poor design causes frequent coolant leaks
  • DPF clogging: Diesel particulate filter prone to clogging, reducing performance
  • EGR cooler failure: Similar to the 6.0L, but with two coolers instead of one
  • Oil dilution: Fuel contamination of engine oil due to regeneration cycles
  • Up-pipe cracks: Exhaust leaks causing power loss and soot buildup
  • HPFP failures: High-pressure fuel pump issues leading to expensive repairs

Considerations for Buyers

If you’re still considering a 6.4L Powerstroke despite its issues:

  • Look for deleted trucks: Vehicles with emissions equipment removed may be more reliable
  • Check maintenance history: Regular, meticulous maintenance is crucial
  • Budget for repairs: Be prepared for potentially expensive fixes
  • Consider alternatives: The 7.3L or 6.7L Powerstrokes are generally more reliable options

Maintenance Tips

For those who already own a 6.4L Powerstroke:

  • Change oil frequently: Every 5,000 miles instead of the recommended 10,000
  • Use high-quality oil: Synthetic blends are best for this engine
  • Monitor oil levels: Check regularly for fuel dilution
  • Replace fuel filters: Change both primary and secondary filters as scheduled
  • Use fuel additives: Help improve lubricity and protect the fuel system

Conclusion

While the 6.4L Powerstroke can be a powerful engine when properly maintained, its reliability issues make it a risky choice for used truck buyers. All model years from 2008 to 2010 are generally considered problematic, with 2008 being the most troublesome. Potential buyers should carefully weigh the risks and consider alternatives like the more reliable 7.3L or 6.7L Powerstroke engines.

FAQs About 6.4 Powerstroke Years to Avoid

  • Is there any 6.4 Powerstroke year that’s considered good?
    No, all years (2008-2010) are generally considered problematic, though some 2010 models may be slightly better.
  • Can a 6.4 Powerstroke be made reliable?
    While extensive modifications and careful maintenance can improve reliability, it’s still considered one of the least dependable Powerstroke engines.
  • What’s the average lifespan of a 6.4 Powerstroke?
    Many 6.4L engines experience major issues before reaching 200,000 miles, significantly less than other Powerstroke engines.