Are Ford custom engines reliable?

Overall, Ford's in-house engine lineup is generally reliable, with standout confidence in the 5.0-liter Coyote V8 and the 6.7-liter Power Stroke diesel. EcoBoost turbo engines offer solid performance and efficiency but tend to require attentive maintenance to sustain long-term reliability. In short, Ford engines are dependable when properly cared for and used within their designed operating conditions.

In this article, we examine how reliability varies across Ford's modern engines, what factors influence longevity, and practical maintenance steps to keep engines running smoothly.

Understanding Ford's engine reliability landscape

Reliability assessments come from warranty data, owner reports, and industry reviews that track long-term durability across model years. Ford’s engine lineup spans naturally aspirated V8s, turbocharged EcoBoost engines, and heavy-duty diesel Power Stroke units. Each family has its own strengths and potential trouble spots, which can shift with model-year updates and maintenance practices.

Reliability by engine family

The following overview summarizes how owners and reviewers typically perceive the main Ford engine families in modern vehicles. This section focuses on durability and common concerns, rather than every individual model year.

• 5.0L Coyote V8 — Widely praised for durability and long service life when serviced on schedule; simple enough in design relative to turbocharged engines, contributing to reliable performance in trucks and muscle cars alike.


• 2.3L EcoBoost — Noted for strong torque and efficiency; generally reliable in daily driving, with improvements in later years addressing early turbo and cooling concerns observed by some owners.


• 3.5L EcoBoost V6 — A workhorse for many trucks and SUVs; reliability is solid overall, though some model-year issues have been linked to turbo systems and related components in certain applications.


• 6.2L V8 — Found primarily in select trucks; praised for straightforward reliability and ease of maintenance, often performing well in high-mileage fleets.


• 6.7L Power Stroke Diesel — A rugged heavy-duty option with strong reliability when properly maintained; diesel-specific systems (DEF,Filters, cooling) require attentive service to avoid downtime.

Conclusion: Across the board, Ford engine families offer solid reliability, with naturally aspirated V8s and diesel powertrains typically earning the strongest reputations. Turbocharged EcoBoost engines reward diligent maintenance and correct operating practices to reach their full reliability potential.

Maintenance and usage patterns that affect reliability

Maintenance routines and how a vehicle is used play a major role in how reliably Ford engines perform over time. The following checklist highlights practices that help maximize engine longevity and minimize issues.

• Follow Ford’s official maintenance schedule for oil changes, filters, and fluid replacements, using manufacturer-approved fluids where specified.


• Keep cooling systems in good condition, especially for EcoBoost engines that rely on reliable turbo cooling and for diesel engines with cooling and DEF systems.


• Address recalls and service campaigns promptly; many reliability improvements are introduced via manufacturer updates.


• Monitor and maintain intake and fuel systems; direct-injection EcoBoosts can accumulate carbon buildup if not properly maintained, so air and fuel cleanliness matters.


• Use quality fuels and ensure proper spark plug and ignition system maintenance where applicable; older or high-mileage engines may benefit from timely component replacements.

Conclusion: Consistent maintenance, adherence to recommended service intervals, and timely updates from Ford contribute significantly to engine reliability across the lineup.

Bottom line and practical takeaways

Ford’s current engine lineup generally delivers reliable performance, with the strongest reputations attached to the 5.0L Coyote V8 and the 6.7L Power Stroke diesel. EcoBoost engines offer impressive efficiency and power, but owners should stay on top of maintenance and be mindful of model-year-specific issues that may arise. Prospective buyers and owners should review maintenance histories, recall status, and service bulletins for their particular engine and vehicle to gauge long-term reliability.

Summary: In broad terms, Ford engines are reliable when properly maintained and used within design parameters. For longevity, prioritize regular service, address recalls promptly, and choose model-year combinations that have demonstrated strong durability in independent reviews and owner feedback.

Which Ford engine to stay away from?

Ford engines to avoid include the 6.0L and 6.4L Power Stroke diesels, known for catastrophic failures like EGR and head gasket issues. Other problematic engines are the 5.4L Triton V8 for its spark plug and timing chain problems, the 3.8L and 4.2L SXV6 engines for head gasket failures and timing chain issues, and certain EcoBoost models (especially early 2.7L and some 1.0L, 1.5L, 1.6L) that have faced problems with oil consumption, turbochargers, and coolant leaks.
 
This video discusses problematic Ford engines including the 6.4L Power Stroke: 1mAutotrendsYouTube · Jun 29, 2025
Diesel engines

• 6.0L Power Stroke (2003-2007): Prone to injector, EGR cooler, and head gasket failures.
• 6.4L Power Stroke (2008-2010): Suffers from fuel dilution, clogged DPFs, and cracked pistons. 

V8 engines

• 5.4L Triton (1997-2010): Has issues with spark plugs breaking during removal, cam phaser failures, and timing chain stretch. 

This video explains why the 5.4L Triton engine is considered one of the worst: 53sSeats & WheelsYouTube · Aug 10, 2025
V6 engines

• 3.8L SXV6 (1982-2008): Often experiences head gasket failures. 
• 4.2L SX V6 (1997-2008): Has a problematic timing chain system with plastic guides that can fail and lead to catastrophic engine damage. 

EcoBoost engines

• Early 2.7L EcoBoost (circa 2016-2017): Some models had problems with defective valve guides, turbocharger failures, and leaking plastic oil pans. 
• 1.0L, 1.5L, and 1.6L EcoBoost: Some versions of these engines have reported issues with coolant intrusion into the engine block, overheating, and turbocharger failures. 
• 3.5L EcoBoost: Common complaints include carbon buildup on intake valves, premature timing chain wear, and water pump failures. 

This video explains some of the issues with the EcoBoost engine: 1mExoticCar PlayPlaceYouTube · Nov 15, 2025
Other engines to be cautious about

• Certain 2.0L, 2.5L, and 3.6L boxer engines: Some model years are less reliable. 

What is the most reliable engine in the Ford Transit Custom?

2.2 TDCi Duratorq
Which Ford Transit Custom Engine Is Best? The most reliable engine in the Transit Custom range is the 2.2 TDCi Duratorq used between 2012 and 2016. It's chain-driven, proven in high-mileage use, and far less problematic than the newer 2.0 EcoBlue.

Is the Ford Custom reliable?

Ford Transit Custom's have a extremely good reliability rating of 841/999.

What's the most reliable Ford engine?

The most reliable Ford engines are often cited as the 5.0L V8 Coyote and the 7.3L "Godzilla" V8, known for their durability and simpler design. For a more modern, turbocharged option, the 3.5L V6 EcoBoost has proven to be reliable, especially after its 2018 refresh, and the 2.7L V6 EcoBoost is also highly regarded for its reliability. Older, legendary diesel engines like the 7.3L Power Stroke are also considered very reliable. 
You can watch this video to learn why the 7.3L Godzilla V8 is considered one of the most reliable pickup truck engines: 51sGetty's GarageYouTube · Oct 2, 2025
Modern gas engines

• 5.0L V8 Coyote: A popular choice known for its durability and longevity. Technicians often favor it for its power and simplicity compared to turbocharged engines. 
• 7.3L "Godzilla" V8: Found in larger trucks like the F-250, this engine is built for heavy-duty work and long life, utilizing traditional, robust design elements like a single timing chain and cast iron block, says this YouTube video. 
• 3.5L V6 EcoBoost: This turbocharged engine is very reliable, particularly the second generation (post-2018) which fixed many initial issues. 
• 2.7L V6 EcoBoost: Considered by many to be a very reliable and solid choice, often recommended by technicians, notes this Reddit thread. 
• 3.3L V6: This naturally aspirated engine is a reliable option due to its lack of turbocharging, which reduces stress on the engine. 

This video compares the 3.5L EcoBoost and 5.0L Coyote engines: 59s8020 AutomotiveYouTube · Feb 28, 2023
Older and diesel engines 

• 7.3L Power Stroke V8: This is a legendary diesel engine known for its robust and reliable performance.
• 6.7L Power Stroke V8: This more modern diesel engine is also considered highly reliable, though some owners have reported issues with the emissions control systems. 

Factors to consider

• Simplicity vs. technology: Naturally aspirated engines, like the 5.0L V8 and 3.3L V6, have fewer components and may offer simpler, long-term reliability. Turbocharged engines (EcoBoost) are more complex but offer greater power and efficiency. 
• Maintenance: Proper maintenance, including regular oil changes, is crucial for the longevity of any engine, especially for turbocharged and modern engines, note Edge AutoSports and Reddit users.