The Ford 6.7L Power Stroke diesel engine has been a workhorse in the Super Duty lineup since 2011, and its reputation is a key factor for anyone considering purchasing a used or new Ford truck. But are these engines truly reliable, and what do real-world users have to say about their experiences? Let's dive into the details and uncover the truth behind the 6.7L Power Stroke's performance, reliability, and overall user satisfaction.

A Quick History Lesson: From Scorpion to Godzilla's Partner

Before we get into the nitty-gritty, let's quickly recap the 6.7L Power Stroke's evolution. Ford designed this engine internally, breaking away from the previous Navistar-sourced diesels that had faced some reliability challenges. The first generation, often called the "Scorpion" due to its unique turbocharger placement within the engine's V, ran from 2011 to 2014. These models were a significant improvement over previous Ford diesels. Subsequent generations, from 2015 onwards, saw further refinements and power increases, solidifying the 6.7L's place as a serious contender in the diesel truck market. It now happily coexists alongside the gasoline 7.3L "Godzilla" engine, offering distinct strengths to different truck buyers.

What Makes the 6.7L Power Stroke Tick? Key Features and Innovations

Understanding the engine's design helps explain its performance and potential issues. Here are some key features:

  • Reverse-Flow Cylinder Heads: This design places the exhaust manifolds inside the "V" of the engine and the intake manifolds on the outside. This improves turbocharger response and reduces emissions.
  • Single Sequential Turbocharger (2011-2019): Early models used a single, complex turbocharger designed to provide quick spool-up at low RPMs and strong top-end power.
  • Variable Geometry Turbocharger (VGT): The VGT allowed for optimal airflow at different engine speeds, improving efficiency and performance.
  • Compacted Graphite Iron (CGI) Block: The CGI block is stronger and lighter than traditional cast iron, contributing to the engine's durability and reduced weight.
  • High-Pressure Common Rail Fuel System: This system delivers precise fuel injection, improving fuel economy and reducing emissions.
  • Aluminum Cylinder Heads: Aluminum heads contribute to weight reduction and improved cooling.
  • Dual High-Pressure Fuel Pumps (HPFP) (2020+): Starting in 2020, Ford upgraded to a dual HPFP system for increased fuel delivery and power potential.
  • 10-Speed Automatic Transmission: The 10-speed transmission, introduced in later models, provides a wider gear ratio spread for improved towing performance and fuel economy.

The Good Stuff: What Owners Love About Their 6.7L Power Strokes

So, what are the main reasons people choose and love the Ford 6.7L Power Stroke?

  • Power and Torque: The 6.7L delivers impressive power and torque, making it a capable workhorse for towing and hauling heavy loads. Owners frequently praise its ability to effortlessly handle demanding tasks.
  • Refined Driving Experience: Compared to older diesel engines, the 6.7L is relatively quiet and smooth, providing a more comfortable driving experience.
  • Towing Capability: It excels at towing. The engine's robust power and the Super Duty's chassis create a formidable towing machine.
  • Reliability (Generally): While not perfect, the 6.7L is generally considered more reliable than previous Ford diesel engines. Many owners report high mileage with minimal issues.
  • Aftermarket Support: The aftermarket for the 6.7L is vast, with plenty of options for performance upgrades, maintenance parts, and accessories.

The Not-So-Good Stuff: Common 6.7L Power Stroke Problems

No engine is perfect, and the 6.7L Power Stroke has its share of potential issues. Understanding these problems can help you make an informed decision and potentially avoid costly repairs.

  • Turbocharger Issues (Early Models): The single sequential turbocharger in the 2011-2019 models could be prone to failure, especially if not properly maintained. Carbon buildup and actuator problems were common concerns.
  • Fuel System Contamination: Diesel fuel contamination is a common issue in all diesel engines, and the 6.7L is no exception. Water and debris in the fuel can damage the high-pressure fuel pump and injectors. Regular fuel filter changes are crucial.
  • CP4 High-Pressure Fuel Pump Failure (Pre-2020): While not as prevalent as in some other diesel engines, the CP4 pump used in pre-2020 models has been known to fail catastrophically. This failure can send metal debris throughout the fuel system, requiring extensive and expensive repairs. The 2020+ dual HPFP system addressed this concern.
  • Exhaust Gas Recirculation (EGR) System Problems: The EGR system is designed to reduce emissions, but it can also be a source of problems. Carbon buildup in the EGR cooler and valve can lead to reduced performance and potential failures.
  • Diesel Particulate Filter (DPF) Issues: The DPF traps soot and particulate matter from the exhaust. If the DPF becomes clogged, it can lead to reduced performance and potential engine damage. Frequent short trips can exacerbate this problem, as the engine may not reach the necessary temperature to regenerate the DPF.
  • Cooling System Problems: Overheating can be a concern, especially when towing heavy loads in hot weather. Maintaining the cooling system and ensuring proper coolant levels are essential.
  • Sensor Failures: Like any modern engine, the 6.7L relies on numerous sensors to monitor its performance. Sensor failures can lead to various issues, from reduced performance to engine misfires.

User Trust and Ratings: What the People Say

Numbers and specifications are important, but what really matters is what real-world users think. Here's a look at user trust and ratings for the Ford 6.7L Power Stroke:

  • Overall Satisfaction: Generally, owners report high satisfaction with the 6.7L Power Stroke, particularly those with newer models. The engine's power, towing capability, and relatively refined driving experience are frequently cited as positives.
  • Reliability Ratings: Reliability ratings vary depending on the source and model year. Some sources rate the 6.7L as above average in reliability, while others are more cautious. It's important to consider the specific model year and maintenance history when evaluating reliability.
  • Online Forums and Communities: Online forums and communities dedicated to Ford trucks and diesel engines provide a wealth of information and user experiences. These forums can be valuable resources for troubleshooting problems, sharing maintenance tips, and learning about potential issues. Be aware that online forums tend to highlight problems, so take the information with a grain of salt.
  • JD Power and Associates: JD Power's vehicle dependability studies provide insights into long-term reliability. While specific data for the 6.7L Power Stroke alone may be limited, these studies can offer a broader perspective on the reliability of Ford trucks.
  • Consumer Reports: Consumer Reports provides reliability ratings based on owner surveys. These ratings can be a useful tool for comparing the reliability of different vehicles and engines.

Key Takeaway: While some older 6.7L Power Stroke engines had issues, Ford has consistently improved the engine over the years. Newer models, particularly those with the dual HPFP system, are generally considered more reliable.

Model Year Matters: Which 6.7L Power Strokes Are the Most Reliable?

As mentioned earlier, the 6.7L Power Stroke has undergone several revisions since its introduction. Here's a general overview of the reliability of different model years:

  • 2011-2014 ("Scorpion"): These early models were a significant improvement over previous Ford diesels, but they could be prone to turbocharger issues and fuel system contamination.
  • 2015-2019: These models saw improvements in power and reliability. The turbocharger was redesigned, and the fuel system was refined. However, the CP4 pump remained a potential concern.
  • 2020+: These models feature the dual HPFP system, which is considered more reliable than the CP4 pump. They also benefit from other refinements and improvements, making them generally the most reliable 6.7L Power Stroke engines.

Recommendation: If you're looking for the most reliable 6.7L Power Stroke, a 2020 or newer model is generally the best choice.

Maintaining Your 6.7L Power Stroke: Tips for Long-Term Reliability

Proper maintenance is essential for ensuring the long-term reliability of any engine, especially a diesel. Here are some key maintenance tips for the 6.7L Power Stroke:

  • Regular Oil Changes: Use the recommended oil and filter, and change the oil at the recommended intervals.
  • Fuel Filter Changes: Change the fuel filter regularly to prevent fuel system contamination.
  • Coolant Flushes: Flush the cooling system periodically to remove deposits and maintain proper cooling performance.
  • Air Filter Replacement: Replace the air filter regularly to ensure proper airflow to the engine.
  • DPF Regeneration: Avoid frequent short trips that prevent the DPF from regenerating properly. If the DPF becomes clogged, consider a forced regeneration or professional cleaning.
  • Monitor Engine Performance: Pay attention to any changes in engine performance, such as reduced power, increased fuel consumption, or unusual noises. Address any issues promptly to prevent further damage.
  • Use Quality Fuel Additives: Consider using fuel additives to improve fuel lubricity and prevent fuel system problems.
  • Regular Inspections: Have your truck inspected regularly by a qualified mechanic to identify and address any potential issues before they become major problems.

Frequently Asked Questions

  • Is the 6.7L Power Stroke a reliable engine? Generally, yes, especially newer models. Regular maintenance is crucial for long-term reliability.
  • What are the common problems with the 6.7L Power Stroke? Potential issues include turbocharger failure (early models), fuel system contamination, CP4 pump failure (pre-2020), EGR system problems, and DPF issues.
  • Which model year of the 6.7L Power Stroke is the most reliable? The 2020 and newer models, with the dual HPFP system, are generally considered the most reliable.
  • How often should I change the oil in my 6.7L Power Stroke? Follow the manufacturer's recommended oil change intervals, typically every 7,500 to 10,000 miles under normal driving conditions.
  • What is the best fuel additive for the 6.7L Power Stroke? There are many reputable fuel additives available. Look for additives that improve fuel lubricity and prevent fuel system problems.
  • How much does it cost to replace a 6.7L Power Stroke engine? Replacement costs can vary widely depending on the source of the engine (new, rebuilt, or used) and the labor costs. Expect to pay anywhere from ,000 to ,000 or more.

The Verdict: Is the 6.7L Power Stroke a Good Choice?

The Ford 6.7L Power Stroke diesel engine has evolved into a powerful and capable workhorse. While older models had some potential issues, Ford has addressed many of these concerns in newer versions. With proper maintenance and care, the 6.7L Power Stroke can provide years of reliable service. Consider the model year, maintenance history, and your specific needs when making your decision.