The BMW 840d xDrive, produced from November 2020 to March 2022, represents a compelling blend of performance and efficiency within the G15 generation of the 8 Series coupe. Positioned as a mid-range offering in the 8 Series lineup, it catered to buyers seeking a sophisticated grand tourer with strong diesel power and all-wheel drive capability. This variant incorporated BMW’s mild-hybrid technology, enhancing both fuel economy and responsiveness. The 840d aimed to bridge the gap between the entry-level 830d and the higher-performance 850i, offering a unique driving experience focused on torque and refined comfort.
Technical Specifications
| Brand | BMW |
| Model | 8 Series |
| Generation | 8 Series (G15) |
| Type (Engine) | 840d (340 Hp) Mild Hybrid xDrive Steptronic |
| Start of production | November, 2020 |
| End of production | March, 2022 |
| Powertrain Architecture | MHEV (Mild Hybrid Electric Vehicle) |
| Body type | Coupe |
| Seats | 4 |
| Doors | 2 |
| Fuel consumption (urban) | 7.1-7.3 l/100 km (33.1 – 32.2 US mpg) |
| Fuel consumption (extra urban) | 4.7-5.0 l/100 km (50 – 47 US mpg) |
| Fuel consumption (combined) | 5.6-5.8 l/100 km (42 – 40.6 US mpg) |
| CO2 emissions | 146-154 g/km |
| Fuel Type | Diesel |
| Acceleration 0 – 100 km/h | 4.8 sec |
| Acceleration 0 – 62 mph | 4.8 sec |
| Acceleration 0 – 60 mph | 4.6 sec |
| Maximum speed | 250 km/h (155.34 mph) |
| Emission standard | Euro 6d |
| Weight-to-power ratio | 5.6 kg/Hp |
| Weight-to-torque ratio | 2.7 kg/Nm |
| Electric motor power | 11 Hp |
| Power | 340 Hp @ 4400 rpm |
| Torque | 700 Nm @ 1750-2250 rpm (516.29 lb.-ft.) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | B57D30B |
| Engine displacement | 2993 cm3 (182.64 cu. in.) |
| Number of cylinders | 6 |
| 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 | 7 l (7.4 US qt | 6.16 UK qt) |
| Coolant capacity | 10.2 l (10.78 US qt | 8.97 UK qt) |
| Kerb Weight | 1915 kg (4221.85 lbs.) |
| Max. weight | 2410 kg (5313.14 lbs.) |
| Max load | 495 kg (1091.29 lbs.) |
| Trunk (boot) space (minimum) | 420 l (14.83 cu. ft.) |
| Fuel tank capacity | 66 l (17.44 US gal | 14.52 UK gal) |
| Max. roof load | 75 kg (165.35 lbs.) |
| Length | 4843 mm (190.67 in.) |
| Width | 1902 mm (74.88 in.) |
| Height | 1341 mm (52.8 in.) |
| Wheelbase | 2822 mm (111.1 in.) |
| Front track | 1627 mm (64.06 in.) |
| Rear track | 1642 mm (64.65 in.) |
| Ride height (ground clearance) | 121 mm (4.76 in.) |
| Drag coefficient (Cd) | 0.29 |
| Minimum turning circle | 11.9 m (39.04 ft.) |
| Drivetrain Architecture | All wheel drive (4×4) with MHEV |
| Number of gears | 8 |
| Gearbox type | Automatic transmission Steptronic |
| Front suspension | Double wishbone |
| Rear suspension | Independent multi-link suspension |
| Front brakes | Ventilated discs |
| Rear brakes | Ventilated discs |
| Tires size (Front) | 245/45 R18 100Y XL |
| Tires size (Rear) | 275/40 R18 103Y XL |
Powertrain & Engine Architecture
The heart of the 840d xDrive is BMW’s B57D30B 3.0-liter inline-six diesel engine. This engine is a member of the modular BMW engine family, known for its robust construction and sophisticated technology. The B57 features a common-rail direct injection system operating at extremely high pressures to optimize combustion efficiency and reduce emissions. A twin-scroll turbocharger with variable geometry turbine (VGT) technology provides a broad torque curve and minimizes turbo lag. The engine also incorporates an intercooler to further enhance performance. The mild-hybrid system, utilizing a 48V starter-generator, provides a power boost during acceleration and allows for smoother start-stop operation, contributing to improved fuel economy. The eight-speed Steptronic automatic transmission is a crucial component, offering quick and precise shifts. It’s programmed to prioritize fuel efficiency in normal driving conditions but can readily adapt to more aggressive settings when desired.
Driving Characteristics
The 840d xDrive delivers a distinctly different driving experience compared to its gasoline-powered siblings. While lacking the outright top-end power of the 850i, the 840d compensates with a massive 700 Nm (516 lb-ft) of torque available from a low 1750 rpm. This translates to effortless acceleration in everyday driving situations and strong performance during overtaking maneuvers. The xDrive all-wheel-drive system provides excellent traction and stability, particularly in adverse weather conditions. The Steptronic transmission is well-tuned, offering smooth gear changes and responsive kickdowns. Compared to a manual transmission, the automatic prioritizes comfort and ease of use, making it ideal for long-distance cruising. While not as sporty as some of BMW’s more focused performance models, the 840d offers a refined and engaging driving experience.
Equipment & Trim Levels
The 840d xDrive came standard with a comprehensive array of luxury features. Interior appointments typically included leather upholstery, power-adjustable seats with memory function, and a premium sound system. Standard technology included BMW’s iDrive infotainment system with a large touchscreen display, navigation, and Apple CarPlay compatibility. Optional extras included features like adaptive cruise control, a head-up display, ventilated seats, and a Bowers & Wilkins Diamond surround sound system. Exterior options included a variety of wheel designs, paint colors, and aerodynamic enhancements. The overall interior ambiance was one of understated elegance and high-quality materials.
Chassis & Braking
The 8 Series utilizes a sophisticated chassis design featuring a double-wishbone front suspension and an independent multi-link rear suspension. This setup provides a comfortable ride while maintaining precise handling characteristics. The 840d xDrive is equipped with ventilated disc brakes on all four wheels, providing ample stopping power. Anti-lock braking system (ABS), dynamic stability control (DSC), and traction control are standard safety features. The steering system is an electric power-assisted rack-and-pinion setup, offering precise and responsive steering feel.
Market Reception & Comparison
The 840d xDrive was generally well-received by automotive critics. It was praised for its strong performance, refined ride quality, and luxurious interior. The diesel engine was noted for its efficiency and torque delivery. Compared to the 850i, the 840d offered a more economical option without sacrificing a significant amount of performance. Against competitors like the Mercedes-Benz S-Class Coupe and the Porsche Panamera, the 840d held its own, offering a unique blend of luxury, performance, and efficiency. Fuel economy was a key selling point, with the 840d consistently achieving impressive MPG figures in real-world testing.
Legacy
The B57 engine family has proven to be remarkably reliable, and the 840d powertrain is no exception. With proper maintenance, these engines are capable of exceeding 200,000 miles. On the used car market, the 840d xDrive represents a compelling value proposition, offering a luxurious grand touring experience at a more accessible price point than its gasoline-powered counterparts. The combination of performance, efficiency, and reliability has made it a popular choice among discerning buyers seeking a sophisticated and capable coupe.
