The Subaru Forester II 2.5i, produced between 2005 and 2008, represented a significant evolution of Subaru’s popular compact SUV. Positioned as a mid-range offering within the second-generation Forester (SF/SG) lineup, the 2.5i variant aimed to balance performance, fuel efficiency, and practicality for the North American and European markets. It built upon the foundation of the first-generation Forester, offering increased space, improved refinement, and Subaru’s signature symmetrical all-wheel drive system. This model year saw a shift towards a more car-like driving experience while retaining the Forester’s off-road capability. The 2.5i was a key model for Subaru, contributing to the Forester’s growing reputation as a versatile and reliable family vehicle.
Technical Specifications
| Brand | Subaru |
| Model | Forester |
| Generation | Forester II |
| Type (Engine) | 2.5 i (158 Hp) |
| Start of production | 2005 |
| End of production | 2008 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | SUV, Crossover |
| Seats | 5 |
| Doors | 5 |
| Fuel consumption (urban) | 12.3 l/100 km (19.1 US mpg) |
| Fuel consumption (extra urban) | 7.5 l/100 km (31.4 US mpg) |
| Fuel consumption (combined) | 9.3 l/100 km (25.3 US mpg) |
| Fuel Type | Petrol (Gasoline) |
| Acceleration 0 – 100 km/h | 9.7 sec |
| Acceleration 0 – 62 mph | 9.7 sec |
| Acceleration 0 – 60 mph | 9.2 sec |
| Maximum speed | 197 km/h (122.41 mph) |
| Weight-to-power ratio | 8.6 kg/Hp |
| Weight-to-torque ratio | 7.3 kg/Nm |
| Power | 158 Hp @ 6400 rpm |
| Torque | 186 Nm @ 3200 rpm (137.19 lb.-ft. @ 3200 rpm) |
| Engine layout | Front, Longitudinal |
| Engine displacement | 1994 cm3 (121.68 cu. in.) |
| Number of cylinders | 4 |
| Engine configuration | Boxer |
| Cylinder Bore | 92 mm (3.62 in.) |
| Piston Stroke | 75 mm (2.95 in.) |
| Compression ratio | 11:1 |
| Number of valves per cylinder | 4 |
| Fuel injection system | Multi-port manifold injection |
| Engine aspiration | Naturally aspirated engine |
| Valvetrain | DOHC |
| Engine oil capacity | 4 l (4.23 US qt | 3.52 UK qt) |
| Coolant capacity | 6.9 l (7.29 US qt | 6.07 UK qt) |
| Kerb Weight | 1360 kg (2998.29 lbs.) |
| Trunk (boot) space – minimum | 406 l (14.34 cu. ft.) |
| Trunk (boot) space – maximum | 1525 l (53.85 cu. ft.) |
| Fuel tank capacity | 60 l (15.85 US gal | 13.2 UK gal) |
| Length | 4450 mm (175.2 in.) |
| Width | 1735 mm (68.31 in.) |
| Height | 1590 mm (62.6 in.) |
| Wheelbase | 2525 mm (99.41 in.) |
| Front track | 1495 mm (58.86 in.) |
| Rear track | 1485 mm (58.46 in.) |
| Drive wheel | All wheel drive (4×4) |
| Number of gears | 5 |
| Gearbox type | Manual transmission |
| Front suspension | Spring Strut |
| Rear suspension | Wishbone |
| Front brakes | Ventilated discs |
| Rear brakes | Drum |
| Assisting systems | ABS (Anti-lock braking system) |
| Steering type | Steering rack and pinion |
| Power steering | Hydraulic Steering |
| Tires size | 205/70 R15 |
Introduction
The 2005-2008 Subaru Forester II 2.5i was a crucial model for Subaru, solidifying the Forester’s position as a leading compact SUV. It was built on the Subaru S platform, also known as the 1HX0/A3 platform, shared with other Subaru models like the Impreza. The 2.5i trim represented a sweet spot in the lineup, offering a more powerful engine than the base 2.0L models, but at a more accessible price point than the turbocharged XT variants. It was primarily marketed towards families and individuals seeking a practical, reliable, and capable vehicle for everyday use and light off-road adventures. The Forester II addressed criticisms of the first generation by offering a more spacious interior and a more refined driving experience.
Powertrain & Engine Architecture
The heart of the Forester 2.5i is the Subaru EJ251 2.5-liter naturally aspirated boxer-four engine. This engine, a hallmark of Subaru engineering, features horizontally opposed pistons, which contribute to a lower center of gravity and reduced vibration. The EJ251 utilizes a single overhead camshaft (SOHC) design per cylinder bank, operating with four valves per cylinder. Fuel delivery is managed by a multi-point fuel injection system, providing precise fuel metering for optimal combustion. The engine produces 158 horsepower at 6,400 rpm and 186 Nm (137 lb-ft) of torque at 3,200 rpm. The 2.5i was typically paired with a five-speed manual transmission, but a four-speed automatic transmission was also available, and the focus of this article. This automatic transmission, while providing convenience, was known for its relatively conservative gear ratios, prioritizing fuel economy over outright performance. The engine code for this configuration is often found as EJ251.
Driving Characteristics
The Forester 2.5i with the four-speed automatic transmission delivers a comfortable and predictable driving experience. Acceleration from 0-60 mph takes approximately 9.2 seconds, which is adequate for everyday driving but noticeably slower than the manual transmission version or the turbocharged XT models. The automatic transmission’s gear ratios are tuned for fuel efficiency, resulting in a slightly less responsive feel during acceleration. However, the engine’s broad torque curve provides sufficient power for merging onto highways and navigating hills. Subaru’s symmetrical all-wheel drive system provides excellent traction in various weather conditions, making the Forester 2.5i a confident performer on slippery roads. The steering is light and precise, contributing to easy maneuverability. Overall, the driving experience is geared towards comfort and practicality rather than sporty performance.
Equipment & Trim Levels
The 2.5i trim level typically included standard features such as air conditioning, power windows and locks, a CD player, and cloth upholstery. Safety features were also a priority, with standard inclusion of anti-lock brakes (ABS) and front airbags. Optional extras included a sunroof, alloy wheels, upgraded audio systems, and leather upholstery. The interior design was functional and straightforward, with a focus on durability and ease of use. The dashboard layout was clean and uncluttered, with logically placed controls. The rear seats offered ample legroom for passengers, and the cargo area was generously sized, especially with the rear seats folded down.
Chassis & Braking
The Forester 2.5i utilizes a MacPherson strut front suspension and a double-wishbone rear suspension, providing a comfortable ride and predictable handling. The suspension is tuned to balance ride comfort with body control. The front brakes are ventilated discs, providing ample stopping power, while the rear brakes are drums. This configuration was common for vehicles in this weight class during the mid-2000s. The steering system is a rack-and-pinion setup with hydraulic power assistance, offering a responsive and precise steering feel. The all-wheel drive system is a symmetrical system, distributing power evenly to all four wheels for optimal traction.
Market Reception & Comparison
The Subaru Forester 2.5i was generally well-received by automotive critics. It was praised for its spacious interior, standard all-wheel drive, and overall reliability. However, some critics noted that the four-speed automatic transmission felt dated compared to newer transmissions with more gears. Compared to the base 2.0L Forester, the 2.5i offered a noticeable improvement in performance. Compared to the turbocharged XT models, the 2.5i was more affordable and fuel-efficient, but lacked the XT’s exhilarating acceleration. Fuel economy was rated at around 25.3 US mpg combined, which was competitive for its class. Reliability was generally good, with the EJ251 engine proving to be a durable and long-lasting powerplant.
Legacy
The Subaru Forester II 2.5i remains a popular choice in the used car market today. The EJ251 engine, while known for potential head gasket issues in some applications, is generally considered reliable when properly maintained. The Forester’s all-wheel drive system and durable construction contribute to its longevity. These vehicles are often sought after by buyers looking for a practical, reliable, and capable SUV at an affordable price. The 2.5i variant, in particular, strikes a good balance between performance, fuel efficiency, and cost of ownership, making it a compelling option for those seeking a versatile and dependable vehicle.
