The Subaru Impreza III Sedan 2.5i, produced between 2008 and 2011, represented a significant evolution in Subaru’s compact car lineup. Positioned as a practical and all-weather capable sedan, it was a key component of Subaru’s strategy to broaden its appeal beyond the niche rally-inspired image of previous Impreza generations. This particular variant, equipped with the 2.5-liter naturally aspirated boxer engine and a four-speed automatic transmission, served as a mainstream offering within the Impreza range, targeting buyers prioritizing comfort and ease of use over outright performance. It was built on the Subaru Impreza platform (GE/GH) and shared many components with the Subaru Outback Sport.
Technical Specifications
| Brand | Subaru |
| Model | Impreza |
| Generation | Impreza III Sedan |
| Type (Engine) | 2.5i (170 Hp) AWD Automatic |
| Start of production | 2008 |
| End of production | 2011 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Sedan |
| Seats | 5 |
| Doors | 4 |
| Fuel Type | Petrol (Gasoline) |
| Emission standard | Euro 4 |
| Weight-to-power ratio | 8.2 kg/Hp, 121.9 Hp/tonne |
| Weight-to-torque ratio | 6.1 kg/Nm, 164.9 Nm/tonne |
| Power | 170 Hp @ 6000 rpm |
| Power per litre | 69.2 Hp/l |
| Torque | 230 Nm @ 4400 rpm (169.64 lb.-ft. @ 4400 rpm) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | EJ253 |
| Engine displacement | 2457 cm3 (149.94 cu. in.) |
| Number of cylinders | 4 |
| Engine configuration | Boxer |
| Cylinder Bore | 99.5 mm (3.92 in.) |
| Piston Stroke | 79 mm (3.11 in.) |
| Number of valves per cylinder | 4 |
| Fuel injection system | Multi-port manifold injection |
| Engine aspiration | Naturally aspirated engine |
| Valvetrain | DOHC |
| Engine oil capacity | 4.2 l (4.44 US qt | 3.7 UK qt) |
| Coolant | 6.7 l (7.08 US qt | 5.9 UK qt) |
| Kerb Weight | 1395 kg (3075.45 lbs) |
| Trunk (boot) space – maximum | 538 l (19 cu. ft.) |
| Fuel tank capacity | 60 l (15.85 US gal | 13.2 UK gal) |
| Length | 4580 mm (180.31 in.) |
| Width | 1740 mm (68.5 in.) |
| Height | 1475 mm (58.07 in.) |
| Wheelbase | 2620 mm (103.15 in.) |
| Front track | 1495 mm (58.86 in.) |
| Rear (Back) track | 1500 mm (59.06 in.) |
| Minimum turning circle (turning diameter) | 10.6 m (34.78 ft.) |
| Drive wheel | All wheel drive (4×4) |
| Number of gears and type of gearbox | 4 gears, automatic transmission |
| Front suspension | Independent type McPherson |
| Rear suspension | Several levers and rods |
| Front brakes | Ventilated discs |
| Rear brakes | Disc |
| Assisting systems | ABS (Anti-lock braking system) |
| Steering type | Steering rack and pinion |
| Tires size | 205/55 R16 |
| Wheel rims size | 16 |
Powertrain & Engine Architecture
The heart of the Impreza 2.5i was the EJ253 engine, a 2.5-liter horizontally opposed (boxer) four-cylinder. This engine design, a Subaru hallmark, offered a low center of gravity, contributing to the car’s balanced handling. The EJ253 featured a single overhead camshaft (SOHC) per cylinder bank, operating four valves per cylinder. Fuel delivery was handled by a multi-point fuel injection system. The engine produced 170 horsepower at 6000 rpm and 230 Nm (169.64 lb-ft) of torque at 4400 rpm. Paired with this engine was a four-speed automatic transmission, designed for smooth and convenient operation. While not offering the sportiness of a manual gearbox, the automatic was well-suited to the target demographic of this trim level.
Driving Characteristics
The 2.5i automatic Impreza offered a comfortable and predictable driving experience. The four-speed automatic, while adequate, wasn’t particularly quick to shift, and lacked the responsiveness of more modern transmissions. Acceleration was reasonable for everyday driving, but noticeably slower than the manual transmission or the more powerful turbocharged Impreza variants. The all-wheel-drive system provided excellent traction in various weather conditions, a key selling point for Subaru. The gear ratios were tuned for fuel efficiency and smooth cruising, rather than spirited performance. The boxer engine’s inherent balance contributed to a refined feel, minimizing vibrations.
Equipment & Trim Levels
The 2.5i trim generally included standard features such as air conditioning, power windows and locks, a basic audio system, and alloy wheels. Safety features like anti-lock brakes (ABS) were also standard. Optional extras included a sunroof, upgraded audio systems, and keyless entry. Interior upholstery was typically cloth, with a relatively simple and functional dashboard layout. The 2.5i was often positioned as the entry-level or mid-range trim, offering a good balance of features and affordability.
Chassis & Braking
The Impreza III Sedan utilized a MacPherson strut front suspension and a multi-link rear suspension. This setup provided a comfortable ride and predictable handling. Braking duties were handled by ventilated discs at the front and solid discs at the rear. The ABS system helped to maintain control during hard braking. The suspension tuning was geared towards comfort and everyday usability, rather than aggressive cornering. Stabilizer bars were included to reduce body roll, but were not as substantial as those found on the sportier Impreza models.
Market Reception & Comparison
The Impreza 2.5i automatic received generally positive reviews for its practicality, reliability, and all-weather capability. Critics noted that the automatic transmission wasn’t the most exciting, and that the engine lacked the punch of the turbocharged options. However, it was praised for its fuel efficiency and comfortable ride. Compared to the more performance-oriented Impreza WRX and STI models, the 2.5i appealed to a different audience – those prioritizing practicality and affordability over outright speed. Compared to other compact sedans of the era, the Impreza 2.5i stood out due to its standard all-wheel drive, offering a unique advantage in inclement weather.
Legacy
The EJ253 engine, while generally reliable, is known to be susceptible to head gasket failures, a common issue with earlier Subaru boxer engines. Regular maintenance, including timely coolant changes, is crucial to prevent this problem. The four-speed automatic transmission, while durable, is not as efficient as more modern transmissions. Today, the Impreza 2.5i automatic remains a relatively affordable and practical used car option. Its all-wheel-drive system and reputation for reliability make it a popular choice for buyers in regions with harsh winters. While not a performance icon, it represents a solid and dependable compact sedan that served as a cornerstone of Subaru’s lineup during the late 2000s.
