What is the best engine for the Ford Flex?
The best engine for the Ford Flex is the 3.5-liter EcoBoost V6, delivering strong acceleration and reasonable highway efficiency for a large family SUV. For buyers who prioritize simplicity and lower maintenance costs, the naturally aspirated 3.5-liter Duratec V6 remains a solid alternative.
What follows explains the available engines, how they compare in real-world use, and what to consider when choosing between them for a Ford Flex.
Engine options for the Ford Flex
The Ford Flex offered two main engine choices during its production life. Here are the engines and what they bring to the table.
- 3.5-liter Ti-VCT V6 (naturally aspirated) — Approximately 262 horsepower and around 248 lb-ft of torque. This engine is simpler, reliable, and typically cheaper to maintain.
- 3.5-liter EcoBoost V6 (turbocharged) — Roughly 365 horsepower and about 350 lb-ft of torque. This engine offers significantly stronger acceleration and better towing capability, at the cost of added complexity and potential maintenance considerations.
In short, the EcoBoost variant provides the best blend of power and efficiency for most Flex buyers, while the naturally aspirated Duratec remains a viable option for those prioritizing simplicity and lower upfront maintenance costs.
Which engine is best for you?
Choosing the right engine depends on how you plan to use the Flex. If you routinely carry a full family and occasional gear or tow modest loads, EcoBoost makes the most sense. If you mostly drive it around town and value long-term reliability and cheaper maintenance, the Duratec V6 can be a sensible choice.
Performance and towing
The EcoBoost’s turbocharged output makes a noticeable difference in acceleration and on-the-line torque for passing and merging. Towing capacity remains competitive; check your model’s brochure for the exact figure, as it varies by drivetrain and trim.
Fuel economy and daily use
On highway stretches, the EcoBoost can be efficient if driven calmly, but aggressive driving will quickly erase any mileage gains. The Duratec engine tends to deliver steadier performance with potentially lower fuel consumption when not heavily loaded.
Maintenance and reliability
The EcoBoost is more complex and requires attentive maintenance, including proper cooling and oil changes, and carbon buildup with direct injection can occur. The Duratec is simpler and typically cheaper to repair but lacks the power and towing capacity of EcoBoost.
Summary
For most Ford Flex buyers, the 3.5L EcoBoost V6 is the recommended engine due to its strong performance and usable efficiency. The naturally aspirated 3.5L Duratec V6 offers a straightforward, cost-effective alternative for drivers who don't need turbocharged power. When shopping, verify which engine your model has, review maintenance history, and consider fuel costs and towing needs to determine the best choice for your situation. Note: the Ford Flex is no longer in production, so engine availability relates to used-model years.
