The BMW 4 Series Coupe (F32) 428i Steptronic, produced from October 2013 to March 2016, represented a key offering within BMW’s expanding 4 Series lineup. Positioned as a mid-range variant, it bridged the gap between the entry-level 420i and the higher-performance 435i and 440i models. Built on the F32 platform – a coupe derivative of the F30 3 Series – the 428i aimed to deliver a blend of sporty handling, refined comfort, and respectable fuel efficiency, appealing to buyers seeking a premium driving experience without the outright performance focus of its more powerful siblings. This model was primarily marketed towards North America and other regions where a balance of performance and economy was highly valued.
| Brand | BMW |
| Model | 4 Series |
| Generation | 4 Series Coupe (F32) |
| Type (Engine) | 428i (245 Hp) Steptronic |
| Start of production | October, 2013 |
| End of production | March, 2016 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Coupe |
| Seats | 4 |
| Doors | 2 |
| Fuel consumption (urban) | 8.1-8.3 l/100 km (29 – 28.3 US mpg) |
| Fuel consumption (extra urban) | 5.2-5.3 l/100 km (45.2 – 44.4 US mpg) |
| Fuel consumption (combined) | 6.3-6.4 l/100 km (37.3 – 36.8 US mpg) |
| CO2 emissions | 147-149 g/km |
| Fuel Type | Petrol (Gasoline) |
| Acceleration 0 – 100 km/h | 5.8 sec |
| Acceleration 0 – 62 mph | 5.8 sec |
| Acceleration 0 – 60 mph | 5.5 sec |
| Maximum speed | 250 km/h (155.34 mph) |
| Emission standard | Euro 6 |
| Weight-to-power ratio | 6 kg/Hp |
| Weight-to-torque ratio | 4.2 kg/Nm |
| Power | 245 Hp @ 5000-6500 rpm |
| Torque | 350 Nm @ 1250-4800 rpm (258.15 lb.-ft. @ 1250-4800 rpm) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | N20B20A |
| 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 | 10:1 |
| Number of valves per cylinder | 4 |
| Fuel injection system | Direct injection |
| Engine aspiration | Twin-scroll turbo, Intercooler |
| Valvetrain | Double-VANOS, VALVETRONIC |
| Engine oil capacity | 5 l (5.28 US qt | 4.4 UK qt) |
| Coolant capacity | 7.5 l (7.93 US qt | 6.6 UK qt) |
| Kerb Weight | 1470 kg (3240.8 lbs.) |
| Max. weight | 1990 kg (4387.2 lbs.) |
| Max load | 520 kg (1146.4 lbs.) |
| Trunk (boot) space | 445 l (15.72 cu. ft.) |
| Fuel tank capacity | 60 l (15.85 US gal | 13.2 UK gal) |
| Length | 4638 mm (182.6 in.) |
| Width | 1825 mm (71.85 in.) |
| Height | 1377 mm (54.21 in.) |
| Wheelbase | 2810 mm (110.63 in.) |
| Drivetrain | Rear wheel drive |
| Number of gears | 8 |
| Gearbox type | automatic transmission Steptronic |
Powertrain & Engine Architecture
The heart of the 428i Steptronic is BMW’s N20B20A 2.0-liter inline-four cylinder engine. This engine is a member of BMW’s highly regarded modular engine family, known for its efficiency and performance. It utilizes direct fuel injection, a twin-scroll turbocharger, and BMW’s variable valve timing and lift systems – Double-VANOS and VALVETRONIC – to optimize power delivery and fuel economy. The twin-scroll turbocharger minimizes turbo lag, providing a more responsive driving experience. The engine produces 245 horsepower at 5,000-6,500 rpm and 258 lb-ft of torque between 1,250 and 4,800 rpm. The “Steptronic” designation refers to BMW’s 8-speed automatic transmission, which features smooth and quick shifts. This transmission is programmed for both efficiency and performance, offering a Sport mode for more aggressive shifting.
Driving Characteristics
The 428i Steptronic delivers a comfortable and engaging driving experience. While not as overtly sporty as the 435i, the 2.0-liter turbo engine provides ample power for everyday driving and spirited acceleration. The 8-speed automatic transmission is well-matched to the engine’s characteristics, providing smooth upshifts and downshifts. Compared to the 6-speed manual transmission available on some 428i models, the Steptronic offers greater convenience, particularly in urban traffic. However, the manual transmission provides a more direct connection to the engine and a more engaging driving experience. The 428i’s rear-wheel-drive configuration contributes to balanced handling, and the suspension is tuned to provide a good compromise between comfort and control. Acceleration from 0 to 60 mph takes approximately 5.5 seconds, making it a competitive performer in its class.
Equipment & Trim Levels
The 428i Steptronic came standard with a comprehensive list of features, including leatherette upholstery, power-adjustable front seats, a BMW iDrive infotainment system with a 6.5-inch display screen, automatic climate control, and a suite of safety features such as anti-lock brakes, stability control, and airbags. Optional extras included leather upholstery, a premium sound system, a navigation system, a head-up display, and various driver-assistance features like lane departure warning and blind-spot monitoring. The interior design emphasized a driver-focused layout with high-quality materials and a modern aesthetic. Trim levels were relatively simple, with most customization options available through individual selections rather than distinct packages.
Chassis & Braking
The 428i utilizes a MacPherson strut front suspension and a multi-link rear suspension, providing a comfortable ride and precise handling. The suspension components are tuned to complement the car’s weight and power output. Braking duties are handled by ventilated disc brakes on all four wheels, providing ample stopping power. The anti-lock braking system (ABS) and dynamic stability control (DSC) enhance safety and stability. The 428i’s chassis is relatively lightweight, contributing to its agile handling characteristics. The standard tire size varied depending on the wheel size selected, ranging from 225/50 R17 to 255/30 R20.
Market Reception & Comparison
The 428i Steptronic was generally well-received by automotive critics. It was praised for its refined engine, comfortable ride, and well-appointed interior. Critics noted that the 428i offered a good balance of performance and fuel economy, making it a practical choice for daily driving. Compared to the 435i, the 428i offered a more affordable entry point into the 4 Series lineup, albeit with less power. The 428i’s fuel economy was notably better than the 435i, making it a more economical choice for those who prioritize efficiency. Reliability reports generally indicated that the N20 engine was relatively reliable, although some owners reported issues with oil leaks and cooling system components.
Legacy
The BMW 428i Steptronic remains a popular choice in the used car market. Its combination of style, performance, and reliability has made it a desirable option for buyers seeking a premium coupe. The N20 engine has proven to be durable, although regular maintenance is essential to prevent potential issues. The 8-speed Steptronic transmission is also known for its reliability. As with any used vehicle, it’s important to have a pre-purchase inspection performed by a qualified mechanic to identify any potential problems. The 428i represents a sweet spot in the 4 Series lineup, offering a compelling blend of driving enjoyment and everyday practicality.
