The BMW 4 Series Coupe (F32), specifically the 420i xDrive variant produced from 2017 to 2020, represents a mid-cycle refresh of the F32 generation. Introduced as part of the “Life Cycle Impulse” (LCI) update, this model aimed to refine the original 4 Series Coupe’s design and technology while maintaining its core grand touring character. The 420i xDrive occupied a key position in the lineup, serving as the entry point to the 4 Series Coupe with all-wheel drive, appealing to buyers seeking a balance of performance, luxury, and all-weather capability. It slotted below the more powerful 430i and 440i models, offering a more accessible price point without sacrificing the BMW driving experience.
Technical Specifications
| Brand | BMW |
| Model | 4 Series |
| Generation | 4 Series Coupe (F32, facelift 2017) |
| Type (Engine) | 420i (184 Hp) xDrive |
| Start of production | 2017 |
| End of production | 2020 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Coupe |
| Seats | 4 |
| Doors | 2 |
| Fuel consumption (urban) | 8.7-9.0 l/100 km (27 – 26.1 US mpg) |
| Fuel consumption (extra urban) | 5.4-5.7 l/100 km (43.6 – 41.3 US mpg) |
| Fuel consumption (combined) | 6.6-6.9 l/100 km (35.6 – 34.1 US mpg) |
| CO2 emissions | 154-161 g/km |
| Fuel Type | Petrol (Gasoline) |
| Acceleration 0 – 100 km/h | 7.6 sec |
| Acceleration 0 – 62 mph | 7.6 sec |
| Acceleration 0 – 60 mph | 7.2 sec |
| Maximum speed | 233 km/h (144.78 mph) |
| Emission standard | Euro 6 |
| Weight-to-power ratio | 8.5 kg/Hp, 117.9 Hp/tonne |
| Weight-to-torque ratio | 5.8 kg/Nm, 173.1 Nm/tonne |
| Power | 184 Hp @ 5000 rpm |
| 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 | 5.25 l (5.55 US qt | 4.62 UK qt) |
| Coolant | 7.8 l (8.24 US qt | 6.86 UK qt) |
| Kerb Weight | 1560 kg (3439.21 lbs.) |
| Max. weight | 2080 kg (4585.62 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 | 4640 mm (182.68 in.) |
| Width | 1825 mm (71.85 in.) |
| Height | 1392 mm (54.8 in.) |
| Wheelbase | 2810 mm (110.63 in.) |
| Front track | 1543 mm (60.75 in.) |
| Rear (Back) track | 1589 mm (62.56 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 | 6 gears, manual transmission |
| 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; 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 is powered by the BMW B48B20A 2.0-liter inline-four cylinder engine. This engine is a member of BMW’s modular engine family, known for its efficiency and performance. It utilizes direct fuel injection, a single twin-scroll turbocharger, and variable valve timing (VANOS) and valve lift (Valvetronic) technologies to optimize power delivery and fuel economy. 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 is longitudinally mounted at the front of the vehicle. The xDrive system is BMW’s intelligent all-wheel-drive system, which normally sends power to the rear wheels but can dynamically distribute torque to the front wheels when traction is needed. The 420i xDrive was typically equipped with an 8-speed automatic transmission, although a 6-speed manual was available in some markets.
Driving Characteristics
The 420i xDrive offers a comfortable and refined driving experience. While not as overtly sporty as the higher-powered 4 Series variants, it provides ample power for everyday driving and highway cruising. The xDrive system enhances stability and traction, particularly in inclement weather. The 8-speed automatic transmission provides smooth and responsive shifts, contributing to a relaxed driving experience. Acceleration from 0 to 60 mph takes approximately 7.2 seconds. Compared to the manual transmission version, the automatic offers slightly slower acceleration but greater convenience. The 420i xDrive’s suspension is tuned for a balance of comfort and handling, providing a composed ride without feeling overly soft.
Equipment & Trim Levels
The 420i xDrive came standard with a comprehensive list of features, including leatherette upholstery, automatic climate control, a 6.5-inch iDrive infotainment system, and a suite of safety features such as ABS, stability control, and airbags. Optional extras included leather upholstery, a larger iDrive screen, navigation, a premium sound system, and various driver-assistance systems like lane departure warning and adaptive cruise control. Trim levels varied by market, but generally, the 420i xDrive could be upgraded with packages that added cosmetic enhancements and additional features.
Chassis & Braking
The 4 Series Coupe utilizes a MacPherson strut front suspension and a multi-link rear suspension. The xDrive models typically featured slightly stiffer springs and dampers to compensate for the added weight of the all-wheel-drive system. The 420i xDrive came equipped with ventilated disc brakes on all four wheels. The braking system is assisted by ABS, electronic brakeforce distribution, and brake assist. The steering system is an electric power-assisted rack-and-pinion system, providing precise and responsive steering feel.
Market Reception & Comparison
The 420i xDrive was generally well-received by automotive critics. It was praised for its comfortable ride, refined interior, and all-weather capability. However, some critics noted that the engine lacked the outright performance of the 430i and 440i models. Compared to the rear-wheel-drive 420i, the xDrive version offered superior traction and stability, making it a more practical choice for drivers in regions with harsh winters or challenging road conditions. Fuel economy was competitive for its class, with combined fuel consumption ranging from 6.6 to 6.9 l/100 km (35.6 to 34.1 US mpg).
Legacy
The BMW 420i xDrive (F32) has proven to be a reliable and durable vehicle. The B48 engine is generally considered to be a robust and long-lasting unit, although regular maintenance is essential. Common issues include oil leaks and occasional problems with the cooling system. On the used car market, the 420i xDrive represents a good value proposition, offering a blend of luxury, performance, and all-weather capability at a relatively affordable price point. Its popularity has ensured a steady supply of parts and qualified mechanics, making it a relatively easy vehicle to maintain.
