The BMW 4 Series Gran Coupe (F36) 420d Steptronic, produced from 2015 to 2016, represents a compelling blend of practicality and performance within the broader 4 Series Gran Coupe lineup. Positioned as a mid-range offering, it catered to buyers seeking a more efficient and refined experience than the higher-powered gasoline variants, while still providing a premium driving experience. This four-door coupe, built on the F30 3 Series platform, aimed to bridge the gap between traditional sedans and sporty coupes, offering increased versatility without sacrificing BMW’s core driving dynamics. The 420d Steptronic specifically combined a 2.0-liter turbocharged diesel engine with an eight-speed automatic transmission, a configuration designed for both fuel economy and comfortable cruising.
Technical Specifications
| Brand | BMW |
| Model | 4 Series |
| Generation | 4 Series Gran Coupe (F36) |
| Type (Engine) | 420d (190 Hp) Steptronic |
| Start of production | 2015 |
| End of production | 2016 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Coupe |
| Seats | 5 |
| Doors | 5 |
| Fuel consumption (urban) | 4.7-5.1 l/100 km (50 – 46.1 US mpg, 60.1 – 55.4 UK mpg, 21.3 – 19.6 km/l) |
| Fuel consumption (extra urban) | 3.6-3.9 l/100 km (65.3 – 60.3 US mpg, 78.5 – 72.4 UK mpg, 27.8 – 25.6 km/l) |
| Fuel consumption (combined) | 4.0-4.3 l/100 km (58.8 – 54.7 US mpg, 70.6 – 65.7 UK mpg, 25 – 23.3 km/l) |
| CO2 emissions | 106-114 g/km |
| Fuel Type | Diesel |
| Acceleration 0 – 100 km/h | 7.3 sec |
| Acceleration 0 – 62 mph | 7.3 sec |
| Acceleration 0 – 60 mph | 6.9 sec |
| Maximum speed | 231 km/h (143.54 mph) |
| Emission standard | Euro 6 |
| Weight-to-power ratio | 8.1 kg/Hp, 123.4 Hp/tonne |
| Weight-to-torque ratio | 3.9 kg/Nm, 259.7 Nm/tonne |
| Power | 190 Hp @ 4000 rpm |
| Power per litre | 95.2 Hp/l |
| 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 | 1540 kg (3395.12 lbs.) |
| Max. weight | 2100 kg (4629.71 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 | 745 kg (1642.44 lbs.) |
| Permitted towbar download | 75 kg (165.35 lbs.) |
| Length | 4638 mm (182.6 in.) |
| Width | 1825 mm (71.85 in.) |
| Height | 1389 mm (54.69 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 94V; 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 |
INTRODUCTION
The BMW 420d Gran Coupe Steptronic, produced between 2015 and 2016, is a five-door coupe that forms part of the F36 generation of the 4 Series. This model aimed to offer a more practical alternative to the traditional two-door coupe, while retaining the stylish aesthetics and engaging driving experience associated with the BMW brand. The ‘20d’ designation indicates the engine variant – a 2.0-liter turbocharged diesel – and ‘Steptronic’ refers to the eight-speed automatic transmission. Within the 4 Series Gran Coupe range, the 420d Steptronic served as an entry point into the diesel engine options, positioned below the more powerful 425d and 430d models.
Powertrain & Engine Architecture
At the heart of the 420d Steptronic lies the BMW B47D20A engine, a 2.0-liter inline-four cylinder diesel. 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 engine is equipped with a twin-scroll turbocharger with variable geometry turbine (VGT) technology, enhancing responsiveness and minimizing turbo lag. The B47 engine also features advanced thermal management and friction reduction technologies to further improve fuel economy. The eight-speed Steptronic automatic transmission is a torque-converter type, offering smooth and quick gear changes. It features adaptive shift programs that adjust to the driver’s style and road conditions. Manual shift control is also available via steering wheel-mounted paddles or the gear selector lever.
Driving Characteristics
The 420d Steptronic delivers a comfortable and refined driving experience. While not as overtly sporty as its higher-powered siblings, the 190 horsepower and 400 Nm (295 lb-ft) of torque provide ample performance for everyday driving and long-distance cruising. Acceleration from 0 to 60 mph takes approximately 6.9 seconds. The eight-speed automatic transmission is well-matched to the engine’s characteristics, providing smooth upshifts and downshifts. The gear ratios are optimized for both fuel efficiency and responsiveness. Compared to the manual transmission versions of the 420d, the Steptronic offers greater convenience, particularly in urban traffic. However, some enthusiasts may find the manual version more engaging. The 420d’s power delivery is linear and predictable, making it easy to control in various driving situations. The rear-wheel-drive configuration contributes to balanced handling and a sporty feel.
Equipment & Trim Levels
The 420d Steptronic 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 leather-wrapped steering wheel. Standard safety equipment included ABS, stability control, and multiple airbags. Optional extras included a larger iDrive display screen, navigation system, Harman Kardon premium sound system, heated front seats, and a panoramic sunroof. Interior upholstery options typically included cloth or leather, with a range of color choices available. Trim levels varied depending on the market, but generally included Sport, Luxury, and M Sport packages, each adding unique styling and equipment enhancements.
Chassis & Braking
The 4 Series Gran Coupe utilizes a sophisticated chassis design, featuring an independent suspension system at all four wheels. The front suspension consists of coil springs and struts, while the rear suspension employs a multi-link setup. This configuration provides a good balance between ride comfort and handling precision. The 420d Steptronic is equipped with ventilated disc brakes on all four wheels, providing ample stopping power. Anti-lock braking system (ABS) and electronic stability control (ESC) are standard features. The steering system is a rack-and-pinion type with electric power assistance, offering precise and responsive steering feel.
Market Reception & Comparison
The 420d Steptronic was generally well-received by automotive critics, who praised its fuel efficiency, comfortable ride, and refined driving experience. It was seen as a practical and stylish alternative to traditional sedans and coupes. Compared to the higher-powered 425d and 430d models, the 420d offered a more affordable entry point into the 4 Series Gran Coupe range. While it lacked the outright performance of its siblings, it provided sufficient power for most drivers. Fuel economy was a key strength of the 420d, with combined fuel consumption figures ranging from 4.0 to 4.3 l/100 km (58.8 – 54.7 US mpg). Reliability was generally good, although some owners reported minor issues with the diesel particulate filter (DPF).
Legacy
The BMW 420d Gran Coupe Steptronic remains 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 has proven to be relatively reliable, although regular maintenance is essential to ensure long-term durability. The eight-speed Steptronic transmission is also known for its robustness. However, potential buyers should be aware of the potential for DPF issues, particularly if the vehicle has primarily been used for short trips. Overall, the 420d Steptronic represents a well-rounded and capable grand tourer that offers a compelling blend of performance, comfort, and economy.
