Technical Specifications
| Brand | BMW |
| Model | 4 Series |
| Generation | 4 Series Gran Coupe (F36, facelift 2017) |
| Type (Engine) | 420d (190 Hp) xDrive Steptronic |
| Start of production | 2017 |
| End of production | 2021 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Coupe |
| Seats | 5 |
| Doors | 4 |
| Fuel consumption (urban) | 5.2-5.6 l/100 km (45.2 – 42 US mpg, 54.3 – 50.4 UK mpg, 19.2 – 17.9 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) | 4.5-4.8 l/100 km (52.3 – 49 US mpg, 62.8 – 58.9 UK mpg, 22.2 – 20.8 km/l) |
| CO2 emissions | 118-126 g/km |
| Fuel Type | Diesel |
| Acceleration 0 – 100 km/h | 7.4 sec |
| Acceleration 0 – 62 mph | 7.4 sec |
| Acceleration 0 – 60 mph | 7 sec |
| Maximum speed | 230 km/h (142.92 mph) |
| Emission standard | Euro 6 |
| Weight-to-power ratio | 8.5 kg/Hp, 117.6 Hp/tonne |
| Weight-to-torque ratio | 4 kg/Nm, 247.7 Nm/tonne |
| Power | 190 Hp @ 4000 rpm |
| Torque | 400 Nm @ 1750-2500 rpm (295.02 lb.-ft. @ 1750-2500 rpm) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | B47D20A |
| 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 | 1615 kg (3560.47 lbs.) |
| Max. weight | 2175 kg (4795.05 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 | 57 l (15.06 US gal | 12.54 UK gal) |
| Max. roof load | 75 kg (165.35 lbs.) |
| Permitted trailer load with brakes (12%) | 1600 kg (3527.4 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) | 0.29 |
| 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; 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 4 Series Gran Coupe (F36), specifically the 420d xDrive Steptronic variant produced from 2017 to 2021, represents a compelling blend of practicality and BMW’s signature driving dynamics. Positioned as a mid-range offering within the 4 Series Gran Coupe lineup, this model aimed to provide a more efficient and accessible entry point into the four-door coupe segment, while still delivering a premium experience. It falls within the LCI (Life Cycle Impulse) or facelift generation of the F36, benefitting from styling and technological updates introduced in 2017. The 420d xDrive Steptronic catered to buyers seeking a balance between performance, fuel economy, and all-weather capability.
Powertrain & Engine Architecture
The heart of the 420d xDrive Steptronic is BMW’s B47D20A 2.0-liter inline-four diesel engine. This engine is a member of BMW’s modular engine family, known for its efficiency and refinement. It utilizes a second-generation common rail direct injection system operating at pressures up to 2,000 bar, ensuring precise fuel delivery and optimized combustion. The B47 features a single twin-scroll turbocharger with variable geometry turbine (VGT) technology, along with an intercooler, to minimize turbo lag and maximize power output across the rev range. The engine produces 190 horsepower at 4,000 rpm and 400 Nm (295 lb-ft) of torque between 1,750 and 2,500 rpm. The engine also incorporates BMW’s BlueEfficiency technologies, including a particulate filter to reduce emissions and meet Euro 6 standards. The engine is paired with BMW’s 8-speed Steptronic automatic transmission, known for its smooth and quick shifts. 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 420d xDrive Steptronic offers a comfortable and refined driving experience. While not as overtly sporty as higher-powered 4 Series variants, the 190 hp engine provides adequate performance for everyday driving and highway cruising. The xDrive all-wheel-drive system ensures excellent traction in various weather conditions, enhancing stability and confidence. The 8-speed automatic transmission is well-tuned, providing smooth gear changes and contributing to the car’s overall efficiency. Compared to the 6-speed manual transmission available on some 420d models, the Steptronic offers greater convenience, particularly in urban traffic. However, some enthusiasts may find the manual transmission more engaging. The gear ratios are optimized for fuel economy and relaxed cruising, with a focus on maximizing torque in the lower and mid-range. Acceleration from 0 to 60 mph takes approximately 7.4 seconds, which is respectable for a diesel-powered Gran Coupe.
Equipment & Trim Levels
The 420d xDrive Steptronic typically came equipped with a generous array of standard features. These included BMW’s iDrive infotainment system with a central display screen, automatic climate control, power-adjustable front seats, and a leather-wrapped steering wheel. Standard safety features included ABS, stability control, multiple airbags, and parking sensors. Optional extras included features such as a premium sound system, navigation system, heated seats, a sunroof, and advanced driver-assistance systems like lane departure warning and adaptive cruise control. Interior upholstery options typically included cloth or leather, with a range of color choices available. Trim levels could vary depending on the market, but generally, the 420d xDrive Steptronic occupied a mid-range position in the 4 Series Gran Coupe lineup, offering a good balance of features and price.
Chassis & Braking
The 4 Series Gran Coupe features a sophisticated chassis design aimed at providing a balance between comfort and handling. The front suspension utilizes independent coil springs and struts, while the rear suspension employs an independent multi-link setup. This configuration helps to minimize body roll and provide precise steering response. The xDrive all-wheel-drive system distributes power between the front and rear axles as needed, optimizing traction and stability. Braking duties are handled by ventilated disc brakes on all four wheels, providing ample stopping power. The ABS (Anti-lock Braking System) and stability control systems further enhance safety. The 420d xDrive Steptronic’s weight of approximately 1615 kg (3560 lbs) is relatively moderate for a vehicle of its size, contributing to its agile handling characteristics.
Market Reception & Comparison
The 420d xDrive Steptronic was generally well-received by automotive critics. It was praised for its fuel efficiency, comfortable ride, and refined driving experience. The xDrive all-wheel-drive system was also highlighted as a significant benefit, particularly in regions with inclement weather. Compared to the more powerful 430d and 440i models, the 420d offered a more affordable entry point into the 4 Series Gran Coupe range, albeit with slightly less performance. In terms of fuel economy, the 420d consistently outperformed its higher-powered siblings, achieving combined fuel consumption figures of around 4.5-4.8 l/100 km (52.3-49 US mpg). Reliability was generally good, although some owners reported minor issues with the diesel particulate filter and turbocharger.
Legacy
The BMW 4 Series Gran Coupe (F36) 420d xDrive Steptronic has established itself as a popular choice in the used car market. Its combination of practicality, efficiency, and BMW’s renowned driving dynamics continues to appeal to buyers. The B47 engine, while known for some potential issues with the timing chain and EGR system, is generally considered to be a robust and reliable unit when properly maintained. The 8-speed Steptronic transmission has also proven to be durable and dependable. As a result, well-maintained examples of the 420d xDrive Steptronic can offer years of reliable service, making it a compelling option for those seeking a premium four-door coupe.
