What is the engine 2.5 L 4 cylinder Ford Fusion 2018?

The 2018 Ford Fusion’s base engine is a 2.5-liter inline-4 Duratec that delivers roughly 170 horsepower and about 170 lb-ft of torque, paired with a six-speed automatic transmission. In this configuration, the Fusion emphasizes smoothness and reliability, with front-wheel drive as standard.

This article explains what that engine is, how it fits into the 2018 Fusion lineup, and how it compares with the other powerplants Ford offered for that year, including turbocharged EcoBoost and hybrid options.

Engine type and design

The 2.5 L inline-4 is part of Ford’s Duratec family, a line of naturally aspirated engines built for efficiency and durability. In the 2018 Fusion, the 2.5 L I-4 uses multipoint fuel injection and a modern valvetrain to balance everyday driving performance with economy.

Core specifications

Below are the primary specs for the 2.5 L Duratec inline-4 as used in the 2018 Fusion. Values can vary slightly by model year and emission controls, but these cover the typical configuration:

• Displacement: 2.5 liters


• Configuration: Inline-4


• Aspiration: Naturally aspirated


• Valvetrain: DOHC with 16 valves


• Fuel system: Sequential multi-point fuel injection


• Output: Approximately 170 horsepower


• Torque: Approximately 170 lb-ft of torque


• Transmission: 6-speed automatic paired with front-wheel drive (no AWD with this engine)

The engine is designed for predictable, comfortable acceleration and reliable everyday operation, rather than high-performance driving. It may incorporate variable cam timing on some variants to support efficiency and emissions without sacrificing drivability.

Position within the Fusion lineup

Ford’s 2018 Fusion offered a range of powertrains to suit different priorities. The 2.0-liter EcoBoost turbocharged engine delivered higher horsepower and, when paired with an optional all-wheel-drive system, more sporty performance. The Fusion Hybrid used a gasoline 2.0-liter Atkinson-cycle engine paired with electric motors for improved fuel economy. The 2.5 L engine sits at the base of the lineup, providing a straightforward, budget-conscious option with proven reliability.

Performance and efficiency notes

Real-world fuel economy with the 2.5 L engine tends to fall in the mid-20s MPG combined, with variations based on drivetrain, trim, and driving style. While not as quick as the EcoBoost variants, the 2.5 L powertrain offers smooth operation and simple maintenance, which many buyers value for daily commuting.

Reliability and maintenance context

As Ford’s base non-turbo engine, the 2.5 L inline-4 emphasizes durability and ease of service. Routine maintenance—oil changes, air and fuel filter replacements, and periodic inspections—helps preserve reliability over the long term. Owners who prioritize predictable ownership costs often favor this engine for its straightforward design and proven track record in the Fusion lineup.

Summary

The 2.5 L inline-4 Duratec in the 2018 Ford Fusion provides a dependable, non-turbo option with about 170 horsepower and ~170 lb-ft of torque, teamed with a 6-speed automatic and front-wheel drive. It stands as the entry-level choice in Ford’s Fusion family, offering balanced performance and steady efficiency alongside more powerful EcoBoost and hybrid alternatives.

Is the Ford 2.5 a good engine?

Yes, the Ford 2.5L Duratec engine is generally considered a good, reliable engine, known for its durability and longevity, often lasting 200,000 miles or more with proper maintenance. However, it is not a performance engine and common issues can include high coolant consumption and, in some cases, transmission problems or power steering failures, so it's important to be aware of these potential drawbacks. 
Pros of the Ford 2.5L engine

• Reliability: The engine has a strong reputation for being durable and long-lasting. 
• Longevity: Many owners report engines reaching high mileage (200,000+ miles) with only regular maintenance. 
• Efficiency: It is an efficient, naturally aspirated engine that performs well in its role, especially in its hybrid form. 
• Maintenance: It is often praised for being straightforward and cost-effective to maintain. 

Cons and potential issues

• Coolant Consumption: A significant number of owners report the engine consuming coolant, sometimes requiring refills every few years, which can lead to overheating if not monitored. 
• Transmission problems: Some automatic transmissions paired with this engine have been reported to have issues, sometimes needing a rebuild. 
• Electronic Power Steering (EPS): In some vehicles, the electronic power steering system has been a point of failure. A recall was issued for the torque sensor, but repairs can be costly if the issue occurs outside the recall period. 
• Performance: The engine is not powerful and is designed for fuel efficiency rather than performance. 

What engine does a 2018 Ford Fusion have?

The 2018 Ford Fusion offered several engine options, including a base 2.5L four-cylinder and turbocharged EcoBoost I-4 and V6 engines. The options ranged from the standard 175-horsepower 2.5L to a 325-horsepower 2.7L V6 for the Sport model. A hybrid powertrain was also available, combining a 2.0L I-4 with an electric motor.
 
This video reviews the performance of the 2018 Ford Fusion SE, including the 2.0L EcoBoost engine: 45sThe Test DriveYouTube · Dec 14, 2017
Engine options and specifications

• 2.5L iVCT I-4: The standard engine, producing 175 horsepower and 175 lb-ft of torque. 
• 1.5L EcoBoost Turbo I-4: An optional turbocharged engine with 181 horsepower and 185 lb-ft of torque. 
• 2.0L EcoBoost Turbo I-4: A more powerful turbocharged option producing 245 horsepower and 275 lb-ft of torque. It was available with all-wheel drive. 
• 2.7L EcoBoost Turbo V6: Exclusive to the Fusion Sport trim, this twin-turbo V6 generates 325 horsepower and 380 lb-ft of torque. 
• Hybrid System: A combination of a 2.0L Atkinson-cycle four-cylinder engine and an electric motor. 

This video demonstrates a 2018 Ford Fusion 1.5L Ecoboost engine block replacement: 58sFord Boss Me - Auto / Politics / Family YouTube · Apr 19, 2021
Transmission

• All models came standard with a six-speed automatic transmission. 
• The hybrid model used an eCVT (electronic continuously variable transmission). 

What is a 2.5 L I4 engine?

A 2.5L I4 engine is a four-cylinder internal combustion engine with a 2.5-liter displacement, where all four cylinders are arranged in a single straight line. This "inline-4" design is common in many vehicles, known for being a fuel-efficient and compact option. The "2.5L" refers to the total volume of all four cylinders, while the "I4" or "inline-4" specifies the number of cylinders and their straight-line configuration.
 
Key characteristics

• Cylinder count: 4 
• Cylinder arrangement: Inline, meaning all cylinders are in a single row along the crankshaft 
• Displacement: 2.5 liters, which is the total volume the pistons displace as they move within all cylinders 
• Performance: Performance varies widely depending on specific design, but it generally offers a balance of power and fuel efficiency. Some turbocharged versions offer significantly more power, while naturally aspirated versions are typically focused on economy. 
• Common features: Many modern 2.5L I4 engines use technologies like variable valve timing, direct injection, and sometimes even cylinder deactivation to improve efficiency. 

Examples in the automotive industry

• The Ford Duratec is a well-known example, praised for its reliability but sometimes prone to coolant consumption. 
• GM Authority produces the Ecotec family of 2.5L I4 engines with features like direct injection and a high-compression combustion system. 
• Some newer GM engines, like the LK0, use a turbocharged version of the 2.5L I4 with an air-to-water intercooler, electric water pump, and cylinder deactivation. 
• Toyota also uses a 2.5L I4 in some of its hybrid and gasoline-powered vehicles, often featuring direct injection and other advanced technologies for efficiency. 

What is the life expectancy of a 2.5 L Ford Fusion engine?

Ford Fusion SE and SEL
Both offer a balance of fuel economy, comfort, and reliability. Equipped with a turbocharged EcoBoost engine, these models provide strong performance while maintaining solid MPG. With regular maintenance, these versions can easily reach the 200,000-mile mark.