The BMW 4 Series Gran Coupe (G26) 430d, produced from May 2022 to June 2024, represents a compelling blend of performance, efficiency, and practicality within the 4 Series lineup. This variant, characterized by its 3.0-liter inline-six diesel engine and mild-hybrid technology, occupies a mid-range position, offering a step up in power and refinement compared to the 420d models while remaining more accessible than the range-topping M440i. The G26 Gran Coupe builds upon the success of the F36 generation, offering a sleek, four-door coupe profile with enhanced interior space and technology.
Technical Specifications
| Brand | BMW |
| Model | 4 Series |
| Generation | 4 Series Gran Coupe (G26) |
| Type (Engine) | 430d (286 Hp) Mild Hybrid xDrive Steptronic |
| Start of production | May, 2022 |
| End of production | June, 2024 |
| Powertrain Architecture | MHEV (Mild Hybrid Electric Vehicle) |
| Body type | Coupe |
| Seats | 5 |
| Doors | 5 |
| Combined fuel consumption (WLTP) | 5.5-6 l/100 km (42.8 – 39.2 US mpg) |
| CO2 emissions (WLTP) | 145-158 g/km |
| Fuel Type | Diesel |
| Acceleration 0 – 100 km/h | 5.3 sec |
| Acceleration 0 – 62 mph | 5.3 sec |
| Acceleration 0 – 60 mph | 5 sec |
| Maximum speed | 250 km/h (155.34 mph) |
| Emission standard | Euro 6d |
| Weight-to-power ratio | 6.5 kg/Hp |
| Weight-to-torque ratio | 2.8 kg/Nm |
| Gross battery capacity | 0.4 kWh |
| Battery voltage | 48 V |
| Battery technology | Lithium-ion (Li-Ion) |
| Electric motor power | 11 Hp |
| Electric motor Torque | 25 Nm (18.44 lb.-ft.) |
| Power | 286 Hp @ 4000 rpm |
| Torque | 650 Nm @ 1500-2500 rpm (479.42 lb.-ft. @ 1500-2500 rpm) |
| Engine displacement | 2993 cm3 (182.64 cu. in.) |
| Number of cylinders | 6 |
| Cylinder Bore | 84 mm (3.31 in.) |
| Piston Stroke | 90 mm (3.54 in.) |
| Compression ratio | 16.5:1 |
| Fuel injection system | Diesel Commonrail |
| Engine oil capacity | 7 l (7.4 US qt | 6.16 UK qt) |
| Kerb Weight | 1845 kg (4067.53 lbs.) |
| Max. weight | 2400 kg (5291.09 lbs.) |
| Trunk (boot) space – minimum | 470 l (16.6 cu. ft.) |
| Trunk (boot) space – maximum | 1290 l (45.56 cu. ft.) |
| Fuel tank capacity | 59 l (15.59 US gal | 12.98 UK gal) |
| Length | 4783 mm (188.31 in.) |
| Width | 1852 mm (72.91 in.) |
| Height | 1442 mm (56.77 in.) |
| Wheelbase | 2856 mm (112.44 in.) |
| Number of gears | 8 |
| Gearbox type | automatic transmission Steptronic |
Powertrain & Engine Architecture
At the heart of the 430d Gran Coupe lies the BMW B57D30B engine, a 3.0-liter inline-six diesel engine. This engine benefits from BMW’s extensive experience in diesel technology, featuring a sophisticated common-rail direct injection system operating at extremely high pressures. The B57 utilizes a twin-scroll turbocharger with variable geometry turbine (VGT) technology, enhancing both low-end responsiveness and high-end power delivery. The mild-hybrid system, incorporating a 48V lithium-ion battery and an integrated starter generator, provides a power boost during acceleration and enables smoother start-stop operation, contributing to improved fuel efficiency. The engine’s DOHC valvetrain, with four valves per cylinder, optimizes gas exchange for increased power and torque. Power is transmitted to all four wheels via BMW’s xDrive all-wheel-drive system and an eight-speed Steptronic automatic transmission. This transmission is known for its smooth and quick shifts, adapting to driving conditions and driver input.
Driving Characteristics
The 430d Gran Coupe delivers a refined and capable driving experience. The 650 Nm (479 lb-ft) of torque, available from a low 1500 rpm, provides strong acceleration in everyday driving situations. The mild-hybrid system effectively fills in any turbo lag, resulting in a seamless power delivery. While not as overtly sporty as the M440i, the 430d offers ample performance for spirited driving, achieving 0-60 mph in approximately 5 seconds. The eight-speed Steptronic transmission is well-tuned, providing smooth gear changes and contributing to relaxed highway cruising. The xDrive system ensures excellent traction in various weather conditions, enhancing stability and confidence. Compared to the 420d, the 430d offers a noticeable increase in performance, while the manual transmission options available on lower trims are absent, focusing on effortless driving.
Equipment & Trim Levels
The 430d Gran Coupe typically comes well-equipped as standard. Features include BMW’s iDrive infotainment system with a touchscreen display, navigation, Apple CarPlay and Android Auto compatibility, and a premium sound system. Standard interior appointments include leather upholstery, power-adjustable front seats with memory function, and dual-zone automatic climate control. Optional extras often include a panoramic sunroof, upgraded leather options, a head-up display, and advanced driver-assistance systems such as adaptive cruise control and lane-keeping assist. Trim levels beyond the base model often add cosmetic enhancements, such as unique exterior styling elements and interior trim finishes.
Chassis & Braking
The G26 Gran Coupe utilizes a sophisticated chassis design, featuring a MacPherson strut front suspension and a multi-link rear suspension. Both ends incorporate stabilizer bars to minimize body roll during cornering. The suspension is tuned to provide a balance between comfort and handling, offering a compliant ride without sacrificing agility. Braking duties are handled by ventilated disc brakes on all four wheels, providing ample stopping power. The electronic stability control (ESC) system and anti-lock braking system (ABS) work in conjunction to enhance safety and control. The steering is electrically assisted, offering precise and responsive feel.
Market Reception & Comparison
The 430d Gran Coupe was generally well-received by automotive critics, praised for its refined engine, comfortable ride, and practical four-door coupe design. Compared to the 420d, the 430d offered a significant performance upgrade, justifying the higher price point for drivers seeking more power. Fuel economy was also a strong point, with the diesel engine delivering impressive mileage for its performance level. While the M440i offered even greater performance, the 430d provided a more balanced combination of power, efficiency, and affordability. Reliability reports have been generally positive, with the B57 engine proving to be a durable and dependable unit.
Legacy
The BMW 430d Gran Coupe (G26) represents a significant step forward in the evolution of the 4 Series lineup. The B57 engine, known for its robustness and efficiency, is expected to remain a reliable powertrain for years to come. On the used car market, these models are sought after for their blend of performance, luxury, and practicality. The mild-hybrid technology, while not as advanced as full hybrid systems, demonstrates BMW’s commitment to improving fuel efficiency and reducing emissions. As a result, the 430d Gran Coupe is likely to maintain its appeal as a desirable and well-rounded grand tourer.
