The BMW 3 Series Sedan (E90) 325xi, produced from 2005 to 2007, represented a significant evolution in BMW’s popular compact executive car line. Positioned as a premium all-wheel-drive variant within the E90 generation, the 325xi offered a blend of performance and all-weather capability. It served as a step up from the base 325i, appealing to buyers in regions experiencing inclement weather or desiring enhanced traction. The E90 chassis, known internally as the 1HX0, marked a departure from its predecessor (E46) with increased dimensions, revised styling, and a greater emphasis on interior refinement and technological features.
Technical Specifications
| Brand | BMW |
| Model | 3 Series |
| Generation | 3 Series Sedan (E90) |
| Type (Engine) | 325xi (218 Hp) |
| Start of production | 2005 |
| End of production | 2007 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Sedan |
| Seats | 5 |
| Doors | 4 |
| Fuel consumption (urban) | 13 l/100 km (18.1 US mpg, 21.7 UK mpg, 7.7 km/l) |
| Fuel consumption (extra urban) | 7 l/100 km (33.6 US mpg, 40.4 UK mpg, 14.3 km/l) |
| Fuel Type | Petrol (Gasoline) |
| Acceleration 0 – 100 km/h | 7.5 sec |
| Acceleration 0 – 62 mph | 7.5 sec |
| Acceleration 0 – 60 mph | 7.1 sec |
| Maximum speed | 242 km/h (150.37 mph) |
| Weight-to-power ratio | 7.1 kg/Hp, 141.1 Hp/tonne |
| Weight-to-torque ratio | 6.2 kg/Nm, 161.8 Nm/tonne |
| Power | 218 Hp @ 6500 rpm |
| Power per litre | 87.3 Hp/l |
| Torque | 250 Nm @ 2750 rpm (184.39 lb.-ft. @ 2750 rpm) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | N52B25A |
| Engine displacement | 2497 cm3 (152.38 cu. in.) |
| Number of cylinders | 6 |
| Engine configuration | Inline |
| Cylinder Bore | 82 mm (3.23 in.) |
| Piston Stroke | 78.8 mm (3.1 in.) |
| Compression ratio | 11:1 |
| Number of valves per cylinder | 4 |
| Fuel injection system | Multi-port manifold injection |
| Engine aspiration | Naturally aspirated engine |
| Engine oil capacity | 6.5 l (6.87 US qt | 5.72 UK qt) |
| Coolant | 8.2 l (8.66 US qt | 7.21 UK qt) |
| Kerb Weight | 1545 kg (3406.14 lbs.) |
| Max. weight | 2060 kg (4541.52 lbs.) |
| Max load | 515 kg (1135.38 lbs.) |
| Trunk (boot) space – minimum | 460 l (16.24 cu. ft.) |
| Fuel tank capacity | 60 l (15.85 US gal | 13.2 UK gal) |
| Length | 4520 mm (177.95 in.) |
| Width | 1817 mm (71.54 in.) |
| Height | 1421 mm (55.94 in.) |
| Wheelbase | 2760 mm (108.66 in.) |
| Front track | 1500 mm (59.06 in.) |
| Rear (Back) track | 1513 mm (59.57 in.) |
| Drive wheel | All wheel drive (4×4) |
| Number of gears and type of gearbox | 6 gears, manual transmission |
| Front suspension | Spring Strut |
| Rear suspension | Coil spring |
| 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 W |
| Wheel rims size | 16 |
Powertrain & Engine Architecture
The heart of the 325xi was the N52B25A, a 2.5-liter inline-six cylinder engine. This engine was a significant advancement over its predecessor, the M54, featuring a fully variable valve timing system (VANOS) on both intake and exhaust camshafts. This allowed for optimized engine performance across a wider RPM range. The N52 utilized a magnesium alloy engine block, contributing to weight reduction. Fuel delivery was handled by a multi-port fuel injection system, providing precise fuel metering. The engine produced 218 horsepower at 6500 rpm and 184 lb-ft of torque at 2750 rpm. The 325xi was exclusively offered with a six-speed manual transmission in the US market, providing drivers with precise control over gear selection. The all-wheel-drive system, BMW’s xDrive, was a viscous coupling-based system that distributed power between the front and rear axles as needed, enhancing traction in slippery conditions.
Driving Characteristics
The 325xi offered a balanced driving experience. While not as overtly sporty as the rear-wheel-drive 330i, the all-wheel-drive system provided confident handling and stability, particularly on less-than-ideal road surfaces. The six-speed manual transmission allowed for engaging gear changes, and the engine’s responsive nature made it enjoyable to drive in everyday situations. Acceleration from 0-60 mph took approximately 7.1 seconds, a respectable figure for the time. Compared to the 325i, the 325xi felt slightly heavier due to the added weight of the xDrive system, but the improved traction more than compensated for this in many driving scenarios. The gear ratios were tuned for a balance of acceleration and fuel efficiency, with a relatively tall sixth gear for highway cruising.
Equipment & Trim Levels
The 325xi came standard with a comprehensive list of features, including power windows, power locks, a multi-function steering wheel, automatic climate control, and a premium sound system. Upholstery was typically cloth, but leather upholstery was available as an option. Optional extras included a sunroof, navigation system, sport package (which added sport seats, sport suspension, and unique styling cues), and premium sound upgrades. The interior design was typical of BMW at the time, with a driver-focused layout and high-quality materials. The sport package was a popular choice, transforming the 325xi into a more engaging and visually appealing vehicle.
Chassis & Braking
The E90 325xi utilized a MacPherson strut front suspension and a multi-link rear suspension, providing a comfortable yet controlled ride. The suspension was tuned to balance handling and comfort, offering a good compromise for everyday driving. Brakes consisted of ventilated discs at the front and solid discs at the rear. Anti-lock brakes (ABS) were standard, along with electronic brake-force distribution (EBD). The xDrive all-wheel-drive system added to the vehicle’s stability during braking, particularly on slippery surfaces. Stabilizer bars were fitted front and rear to reduce body roll during cornering.
Market Reception & Comparison
The 325xi was generally well-received by automotive critics. It was praised for its all-weather capability, comfortable ride, and refined interior. However, some critics noted that it lacked the outright sportiness of the rear-wheel-drive 330i. Fuel economy was reasonable for a vehicle in its class, averaging around 21 mpg in the city and 33 mpg on the highway. Compared to the 325i, the 325xi offered superior traction and stability, but at a slightly higher price point. The 330i, with its more powerful engine, was the choice for drivers prioritizing performance. The 325xi filled a niche for those seeking a balance of performance, practicality, and all-weather confidence.
Legacy
The N52B25A engine, found in the 325xi, is generally considered a reliable powerplant, although preventative maintenance is crucial. Common issues include oil leaks, VANOS system failures, and cooling system problems. The xDrive all-wheel-drive system has also proven to be durable, but regular fluid changes are essential. Today, the E90 325xi represents a relatively affordable entry point into BMW ownership. Well-maintained examples are still sought after by enthusiasts who appreciate the car’s balanced driving dynamics and classic BMW styling. The 325xi remains a capable and enjoyable vehicle, offering a blend of performance, practicality, and all-weather confidence that continues to appeal to a wide range of drivers.
