The BMW 4 Series Coupe (F32) 425d Steptronic, produced primarily during the 2016 model year, represents a compelling blend of performance and efficiency within the broader 4 Series lineup. Positioned as a mid-range offering, it catered to buyers seeking a refined driving experience with strong diesel torque and the convenience of an eight-speed automatic transmission. The F32 generation, launched in 2013, aimed to recapture the spirit of the classic BMW coupes, offering a more driver-focused alternative to the 3 Series sedan. The 425d Steptronic specifically targeted those desiring a balance between spirited driving and economical fuel consumption, making it a popular choice in European markets where diesel engines held significant appeal.
Technical Specifications
| Brand | BMW |
| Model | 4 Series |
| Generation | 4 Series Coupe (F32) |
| Type (Engine) | 425d (224 Hp) Steptronic |
| Start of production | 2016 |
| End of production | 2016 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Coupe |
| Seats | 4 |
| Doors | 2 |
| Fuel consumption (urban) | 5.0-5.4 l/100 km (47 – 43.6 US mpg, 56.5 – 52.3 UK mpg, 20 – 18.5 km/l) |
| Fuel consumption (extra urban) | 4.1-4.3 l/100 km (57.4 – 54.7 US mpg, 68.9 – 65.7 UK mpg, 24.4 – 23.3 km/l) |
| Fuel consumption (combined) | 4.4-4.7 l/100 km (53.5 – 50 US mpg, 64.2 – 60.1 UK mpg, 22.7 – 21.3 km/l) |
| CO2 emissions | 116-124 g/km |
| Fuel Type | Diesel |
| Acceleration 0 – 100 km/h | 6.1 sec |
| Acceleration 0 – 62 mph | 6.1 sec |
| Acceleration 0 – 60 mph | 5.8 sec |
| Maximum speed | 247 km/h (153.48 mph) |
| Emission standard | Euro 6 |
| Weight-to-power ratio | 6.8 kg/Hp, 147.9 Hp/tonne |
| Weight-to-torque ratio | 3.4 kg/Nm, 297 Nm/tonne |
| Power | 224 Hp @ 4400 rpm |
| Torque | 450 Nm @ 1500-3000 rpm (331.9 lb.-ft. @ 1500-3000 rpm) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | B47D20B |
| Engine displacement | 1995 cm3 (121.74 cu. in.) |
| Number of cylinders | 4 |
| Engine configuration | Inline |
| Cylinder Bore | 84 mm (3.31 in.) |
| Piston Stroke | 90 mm (3.54 in.) |
| Compression ratio | 16.5:1 |
| Number of valves per cylinder | 4 |
| Fuel injection system | Diesel Commonrail |
| Engine aspiration | Twin-power turbo, Intercooler |
| Engine oil capacity | 5 l (5.28 US qt | 4.4 UK qt) |
| Coolant | 7 l (7.4 US qt | 6.16 UK qt) |
| Kerb Weight | 1515 kg (3340 lbs.) |
| Max. weight | 2080 kg (4585.62 lbs.) |
| Max load | 565 kg (1245.61 lbs.) |
| Trunk (boot) space – minimum | 445 l (15.72 cu. ft.) |
| Fuel tank capacity | 57 l (15.06 US gal | 12.54 UK gal) |
| Max. roof load | 75 kg (165.35 lbs.) |
| Permitted trailer load with brakes (12%) | 1800 kg (3968.32 lbs.) |
| Permitted trailer load without brakes | 750 kg (1653.47 lbs.) |
| Permitted towbar download | 75 kg (165.35 lbs.) |
| Length | 4638 mm (182.6 in.) |
| Width | 1825 mm (71.85 in.) |
| Height | 1377 mm (54.21 in.) |
| Wheelbase | 2810 mm (110.63 in.) |
| Front track | 1545 mm (60.83 in.) |
| Rear (Back) track | 1594 mm (62.76 in.) |
| Ride height (ground clearance) | 130 mm (5.12 in.) |
| Drag coefficient (Cd) | 0.28 |
| Minimum turning circle (turning diameter) | 11.3 m (37.07 ft.) |
| Drivetrain Architecture | The Internal combustion engine (ICE) drives the rear wheels of the vehicle. |
| Drive wheel | Rear wheel drive |
| Number of gears and type of gearbox | 8 gears, automatic transmission Steptronic |
| Front suspension | Independent coil spring |
| Rear suspension | Independent multi-link suspension |
| Front brakes | Ventilated discs |
| Rear brakes | Ventilated discs |
| Assisting systems | ABS (Anti-lock braking system) |
| Steering type | Steering rack and pinion |
| Power steering | Electric Steering |
| Tires size | 225/50 R17 94W; 225/45 R18; 255/40 R18; 225/40 R19; 255/35 R19 |
| Wheel rims size | 7.5J x 17; 8J x 18; 8.5J x 18; 8J x 19; 8.5J x 19 |
Powertrain & Engine Architecture
The heart of the 425d Steptronic is the BMW B47D20B, a 2.0-liter inline-four cylinder diesel engine. This engine is a member of BMW’s modular engine family, known for its efficiency and refinement. It utilizes a sophisticated common-rail direct injection system, delivering fuel at extremely high pressures for optimized combustion. The B47 features a single twin-scroll turbocharger with variable geometry turbine (VGT) technology, enhancing both low-end torque and high-end power. The engine also incorporates an intercooler to further cool the intake air, increasing density and improving performance. The eight-speed Steptronic automatic transmission is a crucial component, offering smooth and quick shifts. This transmission is known for its adaptability, allowing drivers to select different driving modes (Comfort, Eco Pro, Sport) to tailor the shift points and responsiveness to their preferences. The transmission’s wide gear ratio spread contributes to both fuel efficiency and strong acceleration.
Driving Characteristics
The 425d Steptronic delivers a refined and comfortable driving experience. While not as overtly sporty as some of its gasoline-powered siblings, the 425d offers ample torque – 450 Nm (331.9 lb-ft) – available from a low 1500 rpm. This provides strong acceleration in everyday driving situations, making overtaking and merging onto highways effortless. The eight-speed automatic transmission complements the engine well, providing seamless gear changes and keeping the engine within its optimal power band. Compared to the six-speed manual transmission available on some 425d models, the Steptronic offers greater convenience, particularly in urban traffic. However, the manual transmission provides a more engaging driving experience for enthusiasts. The 0-60 mph time of around 5.8 seconds is respectable for a diesel-powered coupe, and the car feels stable and composed at higher speeds.
Equipment & Trim Levels
The 425d Steptronic typically came equipped with a generous array of standard features. These included leather upholstery, automatic climate control, a BMW iDrive infotainment system with a central display screen, and a suite of safety features such as ABS, stability control, and multiple airbags. Optional extras were plentiful, allowing buyers to personalize their vehicles. Popular options included a navigation system, a premium sound system, heated seats, a sunroof, and various driver-assistance systems like lane departure warning and adaptive cruise control. Interior trim options ranged from basic cloth to more luxurious leather and wood combinations.
Chassis & Braking
The 4 Series Coupe (F32) utilizes a sophisticated chassis design. The front suspension features independent coil springs and struts, while the rear employs an independent multi-link suspension. This setup provides a good balance between ride comfort and handling precision. The 425d Steptronic typically came equipped with ventilated disc brakes on all four wheels, providing ample stopping power. The steering is electrically assisted, offering precise and responsive control. The car’s relatively low center of gravity and well-tuned suspension contribute to its agile handling characteristics.
Market Reception & Comparison
The 425d Steptronic was generally well-received by automotive critics. It was praised for its refined engine, comfortable ride, and fuel efficiency. Compared to the more powerful 435i models, the 425d offered a more economical alternative without sacrificing too much in terms of driving enjoyment. The 420d, being the entry-level diesel, offered even better fuel economy but lacked the outright performance of the 425d. Reliability reports suggest that the B47 engine is generally robust, although some owners have reported issues with the diesel particulate filter (DPF) and turbocharger.
Legacy
The BMW 4 Series Coupe (F32) 425d Steptronic remains a popular choice in the used car market. Its combination of performance, efficiency, and refinement continues to appeal to buyers seeking a stylish and practical coupe. The B47 engine, while not without its potential issues, is generally considered to be a durable and reliable unit when properly maintained. The Steptronic transmission is also known for its longevity. As with any used vehicle, a thorough inspection by a qualified mechanic is recommended before purchase, paying particular attention to the condition of the DPF and turbocharger.
