The BMW 4 Series Gran Coupe (F36) 420d Steptronic, produced from 2014 to 2015, represents a compelling entry point into the 4 Series Gran Coupe lineup. Positioned as a diesel-powered variant, it aimed to deliver a balance of performance, fuel efficiency, and practicality within the premium four-door coupe segment. This model utilizes BMW’s EfficientDynamics technologies and is built on the F36 chassis, part of the broader F30 3 Series platform. The 420d Steptronic offered a more economical alternative to the higher-performance gasoline models, appealing to buyers prioritizing fuel costs and long-distance comfort.
Technical Specifications
| Brand | BMW |
| Model | 4 Series |
| Generation | 4 Series Gran Coupe (F36) |
| Type (Engine) | 420d (184 Hp) Steptronic |
| Start of production | 2014 |
| End of production | 2015 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Coupe |
| Seats | 5 |
| Doors | 5 |
| Fuel consumption (urban) | 5.4 l/100 km (43.6 US mpg, 52.3 UK mpg, 18.5 km/l) |
| Fuel consumption (extra urban) | 4.1 l/100 km (57.4 US mpg, 68.9 UK mpg, 24.4 km/l) |
| Fuel consumption (combined) | 4.6 l/100 km (51.1 US mpg, 61.4 UK mpg, 21.7 km/l) |
| CO2 emissions | 121 g/km |
| Fuel Type | Diesel |
| Acceleration 0 – 100 km/h | 7.5 sec |
| Acceleration 0 – 62 mph | 7.5 sec |
| Acceleration 0 – 60 mph | 7.1 sec |
| Maximum speed | 231 km/h (143.54 mph) |
| Emission standard | Euro 6 |
| Weight-to-power ratio | 8.3 kg/Hp, 120.7 Hp/tonne |
| Weight-to-torque ratio | 4 kg/Nm, 249.2 Nm/tonne |
| Power | 184 Hp @ 4000 rpm |
| Power per litre | 92.2 Hp/l |
| Torque | 380 Nm @ 1750-2750 rpm (280.27 lb.-ft. @ 1750-2750 rpm) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | N47D20C |
| 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 | 5.2 l (5.49 US qt | 4.58 UK qt) |
| Coolant | 7 l (7.4 US qt | 6.16 UK qt) |
| Kerb Weight | 1525 kg (3362.05 lbs.) |
| Max. weight | 2085 kg (4596.64 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 94W |
| Wheel rims size | 7.5J x 17 |
Powertrain & Engine Architecture
The heart of the 420d Steptronic is BMW’s N47D20C 2.0-liter inline-four diesel engine. This engine is a member of BMW’s highly regarded N47 family, known for its efficiency and refinement. The N47D20C utilizes a second-generation common rail direct injection system, delivering fuel at pressures up to 1800 bar for optimized combustion. A single twin-scroll turbocharger with variable geometry turbine (VGT) technology provides enhanced responsiveness and power delivery. The engine also features intercooling to further improve efficiency. The Steptronic transmission is an 8-speed automatic gearbox, offering smooth and efficient gear changes. This transmission is known for its quick shifts and adaptive learning capabilities, adjusting shift points based on driving style.
Driving Characteristics
The 420d Steptronic delivers a comfortable and refined driving experience. While not overtly sporty, the 184 horsepower and 380 Nm (280 lb-ft) of torque provide adequate performance for everyday driving and highway cruising. Acceleration from 0-60 mph takes around 7.1 seconds. The 8-speed automatic transmission contributes to relaxed cruising, keeping engine speeds low at highway speeds. Compared to the manual transmission version, the Steptronic offers greater convenience, particularly in urban traffic. However, some drivers may find the automatic slightly less engaging than the manual. Compared to the more powerful 428i or 435i models, the 420d prioritizes fuel economy over outright performance.
Equipment & Trim Levels
The 420d Steptronic typically came equipped with a generous level of standard features. These included automatic climate control, BMW’s iDrive infotainment system with a 6.5-inch display, power-adjustable front seats, and a leather-wrapped steering wheel. Common optional extras included a larger iDrive screen, navigation system, premium sound system, sunroof, and various driver assistance features like parking sensors and lane departure warning. Interior upholstery was typically a combination of cloth and leatherette, with full leather options available. Trim levels varied depending on the market, but generally offered packages that bundled together popular options.
Chassis & Braking
The F36 Gran Coupe features a sophisticated chassis design. The front suspension utilizes independent coil springs and struts, while the rear employs an independent multi-link suspension. This setup provides a good balance of ride comfort and handling precision. The 420d Steptronic typically came equipped with ventilated disc brakes on all four wheels, providing ample stopping power. ABS (Anti-lock Braking System) and electronic stability control are standard safety features. The suspension tuning was generally geared towards comfort, with a focus on absorbing bumps and providing a smooth ride.
Market Reception & Comparison
The 420d Steptronic was generally well-received by automotive critics. It was praised for its fuel efficiency, comfortable ride, and refined interior. However, some reviewers noted that the engine could feel slightly strained when pushed hard. Compared to other trims in the 4 Series lineup, the 420d offered the best fuel economy, making it an attractive option for drivers covering long distances. Its reliability was generally considered good, although some owners reported issues with the timing chain on earlier N47 engines. The 420d competed with other premium four-door coupes, such as the Audi A5 Sportback and the Mercedes-Benz CLS.
Legacy
The BMW 4 Series Gran Coupe (F36) 420d Steptronic remains a popular choice in the used car market. Its combination of practicality, fuel efficiency, and BMW’s renowned build quality makes it an appealing option for buyers seeking a premium coupe. While the N47 engine has been known for timing chain issues, regular maintenance and preventative checks can mitigate this risk. The 8-speed Steptronic transmission has proven to be reliable, and parts availability is generally good. Today, these vehicles offer a relatively affordable entry point into the BMW brand, providing a comfortable and refined driving experience.
