The BMW 4 Series Gran Coupe (F36) 420i xDrive Steptronic, produced from 2014 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 all-wheel drive capability and the convenience of an automatic transmission without the higher price tag of the more powerful 435i or 440i models. This variant aimed to deliver a comfortable and efficient grand touring experience, appealing to both daily commuters and those embarking on longer journeys. It was part of the F36 generation, built on the BMW’s then-current modular platform, sharing underpinnings with the 3 Series (F30) sedan and wagon.
Technical Specifications
| Brand | BMW |
| Model | 4 Series |
| Generation | 4 Series Gran Coupe (F36) |
| Type (Engine) | 420i (184 Hp) xDrive Steptronic |
| Start of production | 2014 |
| End of production | 2016 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Coupe |
| Seats | 5 |
| Doors | 5 |
| Fuel consumption (urban) | 8.6-8.8 l/100 km (27.4 – 26.7 US mpg) |
| Fuel consumption (extra urban) | 5.1-5.2 l/100 km (46.1 – 45.2 US mpg) |
| Fuel consumption (combined) | 6.4-6.5 l/100 km (36.8 – 36.2 US mpg) |
| CO2 emissions | 149-152 g/km |
| Fuel Type | Petrol (Gasoline) |
| Acceleration 0 – 100 km/h | 7.9 sec |
| Acceleration 0 – 62 mph | 7.9 sec |
| Acceleration 0 – 60 mph | 7.5 sec |
| Maximum speed | 231 km/h (143.54 mph) |
| Emission standard | Euro 6 |
| Weight-to-power ratio | 8.6 kg/Hp, 116.1 Hp/tonne |
| Weight-to-torque ratio | 5.9 kg/Nm, 170.3 Nm/tonne |
| Power | 184 Hp @ 5000-6250 rpm |
| Torque | 270 Nm @ 1250-4500 rpm (199.14 lb.-ft. @ 1250-4500 rpm) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | N20B20B |
| Engine displacement | 1997 cm3 (121.86 cu. in.) |
| Number of cylinders | 4 |
| Engine configuration | Inline |
| Cylinder Bore | 84 mm (3.31 in.) |
| Piston Stroke | 90.1 mm (3.55 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 l (5.28 US qt | 4.4 UK qt) |
| Coolant | 8.2 l (8.66 US qt | 7.21 UK qt) |
| Kerb Weight | 1585 kg (3494.33 lbs.) |
| Max. weight | 2145 kg (4728.92 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 | 4638 mm (182.6 in.) |
| Width | 1825 mm (71.85 in.) |
| Height | 1404 mm (55.28 in.) |
| Wheelbase | 2810 mm (110.63 in.) |
| Front track | 1544 mm (60.79 in.) |
| Rear (Back) track | 1590 mm (62.6 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 | 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; 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
At the heart of the 420i xDrive Gran Coupe lies the BMW N20B20B engine, a 2.0-liter turbocharged inline-four cylinder. This engine is a cornerstone of BMW’s modern engine family, known for its blend of efficiency and performance. The N20 utilizes direct fuel injection, delivering fuel directly into the combustion chamber for improved combustion efficiency and reduced emissions. It also features BMW’s Valvetronic technology, which allows for precise control of valve lift and timing, optimizing engine breathing for varying driving conditions. The single twin-scroll turbocharger provides a responsive power delivery, minimizing turbo lag. The engine produces 184 horsepower at 5000-6250 rpm and 270 Nm (199 lb-ft) of torque between 1250 and 4500 rpm. This torque curve provides strong low-end and mid-range acceleration. The engine is paired with BMW’s 8-speed Steptronic automatic transmission. This transmission is renowned for its smooth and quick shifts, contributing to both performance and fuel economy. The xDrive all-wheel-drive system distributes power between the front and rear axles as needed, enhancing traction and stability, particularly in adverse weather conditions.
Driving Characteristics
The 420i xDrive Steptronic 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 8-speed automatic transmission is well-tuned, offering seamless gear changes and contributing to a relaxed driving experience. The xDrive all-wheel-drive system provides confident handling in all conditions, enhancing stability and grip. Compared to the 6-speed manual transmission available in some markets, the Steptronic automatic prioritizes convenience and ease of use. Acceleration from 0 to 60 mph takes approximately 7.5 seconds, which is respectable for a grand coupe. The gear ratios are optimized for both fuel efficiency and responsive acceleration. The engine delivers a linear power delivery, making it easy to modulate throttle inputs. However, drivers seeking a more engaging and sporty driving experience might find the 420i lacking the outright performance of the 435i or 440i models.
Equipment & Trim Levels
The 420i xDrive Gran Coupe came standard with a comprehensive list of features, including leatherette upholstery, automatic climate control, 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. Optional extras included leather upholstery, a premium sound system, a larger iDrive display screen, navigation, and a variety of driver-assistance systems such as lane departure warning and blind-spot monitoring. Trim levels were relatively limited, with most customization options available as individual add-ons. The interior design emphasized a driver-focused layout with high-quality materials and a modern aesthetic.
Chassis & Braking
The 4 Series Gran Coupe utilizes a sophisticated chassis design featuring an independent coil spring suspension in the front and an independent multi-link suspension in the rear. This setup provides a comfortable ride while maintaining good handling characteristics. The 420i xDrive models typically featured slightly stiffer suspension components compared to the rear-wheel-drive variants to compensate for the added weight of the all-wheel-drive system. Braking duties are handled by ventilated disc brakes on all four wheels, providing ample stopping power. The ABS (Anti-lock Braking System) ensures optimal braking performance in emergency situations. The steering system is a rack-and-pinion setup with electric power steering, offering precise and responsive steering feel.
Market Reception & Comparison
The 420i xDrive Steptronic was generally well-received by automotive critics. It was praised for its comfortable ride, refined interior, and efficient engine. However, some reviewers noted that it lacked the outright performance of the more powerful 4 Series variants. Compared to the 428i (later 430i), the 420i offered a more affordable entry point into the 4 Series Gran Coupe range, but at the expense of performance. The 420d, a diesel-powered variant, offered similar fuel economy but with a different driving character. The 420i xDrive provided a compelling alternative for buyers prioritizing all-weather capability and a comfortable driving experience.
Legacy
The N20 engine, found in the 420i xDrive, has proven to be a relatively reliable powertrain, although some owners have reported issues with the timing chain and water pump. Regular maintenance, including oil changes and coolant flushes, is crucial for ensuring long-term reliability. In the used car market, the 420i xDrive Gran Coupe represents a good value proposition, offering a blend of style, practicality, and all-wheel-drive capability at a reasonable price. Its fuel efficiency and comfortable ride make it a suitable choice for daily commuting and long-distance travel. While not the most exciting 4 Series variant, it remains a popular choice for buyers seeking a well-rounded and reliable grand coupe.
