Is the Ford 6.4 Diesel a Good Engine?

When it comes to diesel engines, Ford has made quite a name for itself, especially in the heavy-duty truck market. The Ford 6.4-liter diesel engine, known for its presence in the Super Duty lineup from 2008 to 2010, has garnered both praise and criticism over the years. For mechanics and truck enthusiasts alike, understanding whether this engine is worth your time and money is crucial.

While the 6.4 diesel engine offers impressive power and torque figures, it’s not without its share of issues. Many truck owners have found themselves in the shop more often than they’d like, dealing with problems that can range from minor annoyances to significant failures. So, what’s the deal with the Ford 6.4 diesel? Is it a reliable workhorse or a ticking time bomb? Let’s break it down.

Power and Performance

One of the standout features of the 6.4 diesel is its power output. With a robust 350 horsepower and a staggering 650 lb-ft of torque, this engine is designed to handle heavy loads and tackle tough terrain. Whether you’re towing a trailer or hauling equipment, the 6.4 can deliver the performance you need. However, that power comes at a price, especially when it comes to fuel efficiency and maintenance.

Common Issues

It’s essential to address the elephant in the room: the problems that plague the 6.4 diesel. Many mechanics report issues with the fuel system, particularly the injectors and fuel pumps. Additionally, the engine is known for having a propensity for overheating, which can lead to costly repairs. If you’re considering a vehicle equipped with this engine, be prepared for potential headaches down the road.

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In the following sections, we’ll dive deeper into the specifics of the Ford 6.4 diesel engine, examining its strengths and weaknesses in detail. Whether you’re a mechanic looking to understand the ins and outs or a potential buyer weighing your options, knowing the full story is crucial.

Understanding the Ford 6.4 Diesel Engine

The Ford 6.4-liter diesel engine has been a topic of debate among truck enthusiasts and mechanics alike. To determine whether this engine is a solid choice, we need to dissect its various aspects, including performance, reliability, maintenance issues, and owner experiences. Let’s dig deeper into what makes this engine tick—or, in some cases, tick loudly.

Performance Metrics

When evaluating any engine, performance is a key factor. The Ford 6.4 diesel engine is designed to deliver robust power and torque, making it suitable for heavy-duty applications. Here’s a quick look at its performance specifications:

Specification Value
Displacement 6.4 liters
Horsepower 350 hp @ 3,000 rpm
Torque 650 lb-ft @ 2,000 rpm
Fuel Type Diesel
Transmission Options 6-speed automatic

With these numbers, it’s clear that the 6.4 diesel can handle heavy towing and hauling tasks. However, power isn’t everything; we need to consider how it performs under real-world conditions.

Fuel Economy

While the Ford 6.4 diesel engine offers impressive power, it falls short in fuel efficiency. Typical owners report fuel economy figures that vary widely based on driving habits and load conditions. Here’s a rough estimate:


  • City: 12-15 MPG

  • Highway: 16-20 MPG

Compared to newer diesel engines, which often achieve better fuel economy, the 6.4 can feel a bit outdated. If you’re looking for a workhorse that won’t break the bank at the pump, you might want to consider other options.

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Common Issues and Reliability

The Ford 6.4 diesel engine is notorious for several reliability concerns, which can lead to frequent trips to the mechanic. Here’s a list of common issues:


  1. Fuel Injectors: Prone to failure, leading to poor performance and increased emissions.

  2. Turbocharger Problems: Turbo failure can result in loss of power and increased repair costs.

  3. Cooling System: Overheating is a common issue, often caused by a failing water pump or radiator.

  4. DPF (Diesel Particulate Filter) Issues: Clogging can lead to reduced performance and costly replacements.

  5. Oil Cooler Failures: Can lead to coolant mixing with oil, causing severe engine damage.

The reliability of the 6.4 diesel engine has been called into question due to these issues. Many owners report having to invest significantly in repairs, which can sour the overall ownership experience.

Maintenance Considerations

If you’re considering a Ford 6.4 diesel, be prepared for a maintenance schedule that can be more demanding than other engines. Regular maintenance is crucial to prolonging the life of this engine. Here are some key points to keep in mind:

Recommended Maintenance Schedule

Maintenance Task Frequency
Oil Change Every 5,000-7,500 miles
Fuel Filter Replacement Every 10,000 miles
Coolant Flush Every 30,000 miles
Transmission Fluid Change Every 30,000 miles
Turbo Inspection Every 15,000 miles

Staying on top of these maintenance tasks can help mitigate some of the reliability issues associated with the 6.4 diesel engine. However, it’s essential to be proactive, as ignoring maintenance can lead to more severe problems down the line.

Owner Experiences

Owner reviews of the Ford 6.4 diesel engine are mixed at best. While some appreciate its power and towing capabilities, others are frustrated by the engine’s reliability issues. Here are a few common sentiments:

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  • “The power is great, but the repair bills can be crippling.”

  • “I love the towing capacity, but I’ve replaced the injectors twice.”

  • “It’s a beast when it runs, but I’m always on edge about the next potential failure.”

These experiences highlight the trade-offs involved in owning a Ford 6.4 diesel. It can perform exceptionally well under the right conditions, but the associated risks and costs may not be worth it for everyone.

In summary, the Ford 6.4 diesel engine has its strengths, but it also comes with a host of issues that can make ownership a gamble. If you’re considering this engine, weigh the pros and cons carefully, and be prepared for potential challenges along the way.

Categories: Diesel engine

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