Technical Specifications
| Brand | BMW |
| Model | 4 Series |
| Generation | 4 Series Gran Coupe (F36, facelift 2017) |
| Type (Engine) | 420i (184 Hp) xDrive |
| Start of production | 2017 |
| End of production | 2021 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Coupe |
| Seats | 5 |
| Doors | 4 |
| 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 | 7.8 sec |
| Acceleration 0 – 62 mph | 7.8 sec |
| Acceleration 0 – 60 mph | 7.4 sec |
| Maximum speed | 233 km/h (144.78 mph) |
| Emission standard | Euro 6 |
| Weight-to-power ratio | 8.7 kg/Hp, 115 Hp/tonne |
| Weight-to-torque ratio | 5.9 kg/Nm, 168.8 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 | 5.25 l (5.55 US qt | 4.62 UK qt) |
| Coolant | 7.8 l (8.24 US qt | 6.86 UK qt) |
| Kerb Weight | 1600 kg (3527.4 lbs.) |
| Max. weight | 2160 kg (4761.98 lbs.) |
| Max load | 560 kg (1234.59 lbs.) |
| Trunk (boot) space – minimum | 480 l (16.95 cu. ft.) |
| Trunk (boot) space – maximum | 1300 l (45.91 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 | 1404 mm (55.28 in.) |
| Wheelbase | 2810 mm (110.63 in.) |
| Front track | 1543 mm (60.75 in.) |
| Rear (Back) track | 1592 mm (62.68 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 | 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 |
The BMW 420i xDrive Gran Coupe, produced from 2017 to 2021, is a four-door coupe that successfully combines sporty styling with practical usability. Part of the F36 generation, the Gran Coupe expanded the 4 Series range by offering a more accessible body style than the traditional coupe or convertible. The 2017 facelift brought subtle but important changes to the exterior design, including revised headlights and taillights, along with interior enhancements. The 420i xDrive served as a popular choice for buyers seeking a balance between performance, fuel efficiency, and all-weather capability. It was positioned as a step up from the base 420i, offering the added security and traction of BMW’s xDrive all-wheel-drive system.
Powertrain & Engine Architecture
The 420i xDrive is powered by BMW’s B48B20A 2.0-liter turbocharged inline-four cylinder engine. This engine is part of BMW’s modular engine family, known for its efficiency and responsiveness. The B48 utilizes direct fuel injection, a twin-scroll turbocharger, and variable valve timing (VANOS) and valve lift (Valvetronic) technologies to optimize performance and fuel economy. The engine produces 184 horsepower at 5000 rpm and 270 Nm (199 lb-ft) of torque between 1350 and 4600 rpm. The engine’s longitudinal mounting and front-wheel-drive bias, coupled with the xDrive system, contribute to balanced handling. The 420i xDrive was typically paired with an 8-speed automatic transmission, renowned for its smooth shifts and quick response. This transmission features a torque converter and allows for both fully automatic operation and manual gear selection via steering wheel-mounted paddles or the gear selector.
Driving Characteristics
The 420i xDrive Gran Coupe delivers a comfortable and composed driving experience. While not as overtly sporty as the higher-powered 4 Series variants, it offers sufficient performance for everyday driving and occasional spirited runs. The xDrive all-wheel-drive system provides excellent traction, particularly in adverse conditions, enhancing stability and confidence. The 8-speed automatic transmission contributes to smooth acceleration and efficient cruising. The gear ratios are tuned to prioritize fuel economy while still providing responsive acceleration when needed. Compared to the manual transmission equipped 420i, the automatic offers a more relaxed driving experience, especially in city traffic. However, some driving enthusiasts may prefer the greater driver engagement of the manual gearbox. The 420i xDrive’s weight distribution and well-tuned suspension contribute to predictable handling and a comfortable ride quality.
Equipment & Trim Levels
The 420i xDrive Gran Coupe came standard with a comprehensive list of features, including automatic climate control, power-adjustable front seats, a BMW iDrive infotainment system with a 6.5-inch display screen, and a suite of safety features such as ABS, stability control, and multiple airbags. Common optional extras included a larger iDrive display screen, navigation system, premium audio system, leather upholstery, heated front seats, and a sunroof. Trim levels varied depending on the market, but generally included options for enhanced interior trim materials, exterior styling packages, and driver assistance systems like lane departure warning and adaptive cruise control. The interior typically featured a blend of high-quality materials and a driver-focused design.
Chassis & Braking
The F36 4 Series Gran Coupe utilizes a sophisticated chassis design featuring an independent suspension at all four corners. The front suspension employs coil springs and struts, while the rear suspension utilizes a multi-link setup. This configuration provides a good balance between ride comfort and handling precision. The 420i xDrive typically featured ventilated disc brakes on all four wheels, providing ample stopping power. The ABS (Anti-lock Braking System) and stability control systems work in conjunction with the brakes to enhance safety and control. The steering system is a rack-and-pinion setup with electric power assistance, offering precise and responsive steering feel.
Market Reception & Comparison
The 420i xDrive Gran Coupe was generally well-received by automotive critics. It was praised for its stylish design, comfortable ride, and capable all-wheel-drive system. However, some reviewers noted that the 2.0-liter engine could feel somewhat underpowered compared to the larger engines offered in other 4 Series variants. Compared to the 430i and 440i models, the 420i xDrive offered a more affordable entry point into the 4 Series range, but at the expense of outright performance. In terms of fuel economy, the 420i xDrive generally outperformed the higher-powered models, making it a more practical choice for daily commuting. Reliability reports suggest that the B48 engine is generally robust, but regular maintenance is essential to ensure long-term durability.
Legacy
The BMW 420i xDrive Gran Coupe (F36) remains a popular choice in the used car market. Its blend of style, practicality, and all-wheel-drive capability continues to appeal to buyers seeking a premium four-door coupe. The B48 engine has proven to be a reliable powerplant when properly maintained, and parts availability is generally good. While not the most exhilarating performer in the 4 Series lineup, the 420i xDrive offers a compelling value proposition for those prioritizing comfort, fuel efficiency, and all-weather confidence. Its enduring appeal is a testament to BMW’s ability to create vehicles that are both enjoyable to drive and practical for everyday use.
