The BMW 4 Series Coupe (F32) 420i xDrive Steptronic, produced primarily during the 2016 model year, represents a compelling entry point into the F32 4 Series lineup. Positioned as a mid-range offering, it combined a turbocharged four-cylinder engine with BMW’s xDrive all-wheel-drive system and an eight-speed Steptronic automatic transmission. This configuration aimed to deliver a balance of performance, efficiency, and all-weather capability within the premium compact executive coupe segment. The F32 generation, launched in 2013, was BMW’s replacement for the 3 Series Coupe, establishing the 4 Series as a distinct model range emphasizing style and driving dynamics.
Technical Specifications
| Brand | BMW |
| Model | 4 Series |
| Generation | 4 Series Coupe (F32) |
| Type (Engine) | 420i (184 Hp) xDrive Steptronic |
| Start of production | 2016 |
| End of production | 2016 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Coupe |
| Seats | 4 |
| Doors | 2 |
| Fuel consumption (urban) | 7.7-8.1 l/100 km (30.5 – 29 US mpg, 36.7 – 34.9 UK mpg, 13 – 12.3 km/l) |
| Fuel consumption (extra urban) | 4.8-5.1 l/100 km (49 – 46.1 US mpg, 58.9 – 55.4 UK mpg, 20.8 – 19.6 km/l) |
| Fuel consumption (combined) | 5.9-6.2 l/100 km (39.9 – 37.9 US mpg, 47.9 – 45.6 UK mpg, 16.9 – 16.1 km/l) |
| CO2 emissions | 137-144 g/km |
| Fuel Type | Petrol (Gasoline) |
| Acceleration 0 – 100 km/h | 7.8 sec |
| Acceleration 0 – 62 mph | 7.8 sec |
| Acceleration 0 – 60 mph | 7.4 sec |
| Maximum speed | 231 km/h (143.54 mph) |
| Emission standard | Euro 6 |
| Weight-to-power ratio | 8.5 kg/Hp, 117.2 Hp/tonne |
| Weight-to-torque ratio | 5.8 kg/Nm, 172 Nm/tonne |
| Power | 184 Hp @ 5000 rpm |
| Power per litre | 92.1 Hp/l |
| Torque | 270 Nm @ 1350-4600 rpm (199.14 lb.-ft. @ 1350-4600 rpm) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | B48B20A |
| Engine displacement | 1998 cm3 (121.93 cu. in.) |
| Number of cylinders | 4 |
| Engine configuration | Inline |
| Cylinder Bore | 82 mm (3.23 in.) |
| Piston Stroke | 94.6 mm (3.72 in.) |
| Compression ratio | 11:1 |
| Number of valves per cylinder | 4 |
| Fuel injection system | Direct injection |
| Engine aspiration | Twin-power turbo, Intercooler |
| Engine oil capacity | 5.3 l (5.6 US qt | 4.66 UK qt) |
| Coolant | 7.8 l (8.24 US qt | 6.86 UK qt) |
| Kerb Weight | 1570 kg (3461.26 lbs.) |
| Max. weight | 2090 kg (4607.66 lbs.) |
| Max load | 520 kg (1146.4 lbs.) |
| Trunk (boot) space – minimum | 445 l (15.72 cu. ft.) |
| Fuel tank capacity | 60 l (15.85 US gal | 13.2 UK gal) |
| Max. roof load | 75 kg (165.35 lbs.) |
| Permitted trailer load with brakes (12%) | 1700 kg (3747.86 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 | 1392 mm (54.8 in.) |
| Wheelbase | 2810 mm (110.63 in.) |
| Front track | 1544 mm (60.79 in.) |
| Rear (Back) track | 1590 mm (62.6 in.) |
| Ride height (ground clearance) | 145 mm (5.71 in.) |
| Drag coefficient (Cd) | 0.30 |
| Minimum turning circle (turning diameter) | 11.8 m (38.71 ft.) |
| Drive wheel | All wheel drive (4×4) |
| 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 420i xDrive Steptronic is powered by BMW’s B48B20A 2.0-liter inline-four cylinder engine. This engine is a member of BMW’s modular engine family, characterized by a compact design and advanced technologies. It utilizes direct fuel injection, a single twin-scroll turbocharger, and variable valve timing (VANOS) and valve lift (Valvetronic) systems to optimize performance and efficiency. The B48 engine produces 184 horsepower at 5,000 rpm and 270 Nm (199 lb-ft) of torque between 1,350 and 4,600 rpm. The engine’s aluminum block and head contribute to its relatively lightweight construction. The eight-speed Steptronic automatic transmission is a torque-converter type, known for its smooth shifts and efficiency. It features adaptive shift programs that adjust to the driver’s style and driving conditions. The xDrive all-wheel-drive system employs a multi-plate clutch to distribute torque between the front and rear axles, providing enhanced traction and stability.
Driving Characteristics
The 420i xDrive Steptronic delivers a comfortable and refined driving experience. While not as overtly sporty as higher-powered 4 Series variants, the 184 hp engine provides adequate performance for everyday driving and occasional spirited runs. The eight-speed automatic transmission contributes to smooth acceleration and efficient cruising. The xDrive system provides confident handling in various weather conditions. Compared to the six-cylinder 435i or 440i models, the 420i offers less outright acceleration and a less aggressive exhaust note. However, it excels in fuel economy and provides a more accessible entry point into the 4 Series range. The automatic transmission, while smooth, may not offer the same level of driver engagement as the available six-speed manual transmission.
Equipment & Trim Levels
The 420i xDrive Steptronic typically came standard with features such as leatherette upholstery, automatic climate control, a 6.5-inch iDrive infotainment system, and power-adjustable front seats. Optional extras included a larger iDrive screen, navigation, a premium sound system, heated seats, and various driver-assistance features like lane departure warning and collision warning. Trim levels could vary depending on the market, but generally offered packages that bundled popular options together. The interior design emphasized a driver-focused layout with high-quality materials and a modern aesthetic.
Chassis & Braking
The F32 4 Series features a sophisticated chassis design with a multi-link rear suspension. The 420i xDrive Steptronic utilizes a coil spring front suspension and ventilated disc brakes on all four wheels. The xDrive system adds weight compared to rear-wheel-drive models, which slightly impacts handling balance. The steering is precise and well-weighted, providing good feedback to the driver. Stabilizer bars are fitted front and rear to reduce body roll during cornering. The braking system is generally responsive and provides ample stopping power for everyday driving.
Market Reception & Comparison
The 420i xDrive Steptronic was generally well-received by automotive critics as a practical and efficient entry point into the 4 Series range. It was praised for its comfortable ride, refined interior, and all-weather capability. However, some reviewers noted that the engine lacked the punch of the larger, more powerful engines available in the lineup. Compared to competitors like the Audi A5 Coupe and Mercedes-Benz C-Class Coupe, the 420i offered a compelling blend of performance, luxury, and technology. Fuel economy figures were competitive within its class, and the xDrive system provided a significant advantage in regions with inclement weather.
Legacy
The B48 engine family has proven to be relatively reliable, although some early examples experienced issues with oil leaks and cooling system components. The eight-speed Steptronic transmission is also generally considered durable. The F32 4 Series, including the 420i xDrive Steptronic, has maintained a solid reputation in the used car market. These models offer a good balance of style, performance, and value, making them attractive options for buyers seeking a premium compact coupe. Regular maintenance, including oil changes and coolant flushes, is crucial for ensuring the long-term reliability of this powertrain.
