The BMW 6 Series Gran Turismo (G32) 630d Steptronic, produced from 2017 to 2020, represents BMW’s attempt to blend the luxury and performance of the 6 Series with the practicality of a Gran Turismo body style. Positioned as a mid-range offering within the G32 lineup, it aimed to provide a balance between fuel efficiency, comfortable long-distance cruising, and respectable performance. The 630d utilized BMW’s latest diesel technology and an eight-speed automatic transmission, targeting buyers who prioritized refinement and economy over outright sportiness. It was primarily marketed in Europe and other regions where diesel engines held significant market share, offering a premium alternative to traditional sedans and wagons.
Technical Specifications
| Brand | BMW |
| Model | 6 Series |
| Generation | 6 Series Gran Turismo (G32) |
| Type (Engine) | 630d (265 Hp) Steptronic |
| Start of production | 2017 |
| End of production | 2020 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Grand Tourer |
| Seats | 5 |
| Doors | 5 |
| Fuel consumption (urban) | 5.6-6.1 l/100 km (42 – 38.6 US mpg) |
| Fuel consumption (extra urban) | 4.5-4.9 l/100 km (52.3 – 48 US mpg) |
| Fuel consumption (combined) | 4.9-5.3 l/100 km (48 – 44.4 US mpg) |
| CO2 emissions | 129-139 g/km |
| Fuel Type | Diesel |
| Acceleration 0 – 100 km/h | 6.1 sec |
| Acceleration 0 – 62 mph | 6.1 sec |
| Acceleration 0 – 60 mph | 5.8 sec |
| Maximum speed | 250 km/h (155.34 mph) |
| Emission standard | Euro 6 |
| Weight-to-power ratio | 6.9 kg/Hp, 145.2 Hp/tonne |
| Weight-to-torque ratio | 2.9 kg/Nm, 339.7 Nm/tonne |
| Power | 265 Hp @ 4000 rpm |
| Torque | 620 Nm @ 2000-2500 rpm (457.29 lb.-ft. @ 2000-2500 rpm) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | B57D30A |
| 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 | 6.5 l (6.87 US qt | 5.72 UK qt) |
| Coolant | 11.7 l (12.36 US qt | 10.29 UK qt) |
| Kerb Weight | 1825 kg (4023.44 lbs.) |
| Max. weight | 2510 kg (5533.6 lbs.) |
| Max load | 685 kg (1510.17 lbs.) |
| Trunk (boot) space – minimum | 610 l (21.54 cu. ft.) |
| Trunk (boot) space – maximum | 1800 l (63.57 cu. ft.) |
| Fuel tank capacity | 66 l (17.44 US gal | 14.52 UK gal) |
| Max. roof load | 75 kg (165.35 lbs.) |
| Permitted trailer load with brakes (12%) | 2100 kg (4629.71 lbs.) |
| Permitted trailer load without brakes | 750 kg (1653.47 lbs.) |
| Permitted towbar download | 100 kg (220.46 lbs.) |
| Length | 5091 mm (200.43 in.) |
| Width | 1902 mm (74.88 in.) |
| Width including mirrors | 2158 mm (84.96 in.) |
| Height | 1538 mm (60.55 in.) |
| Wheelbase | 3070 mm (120.87 in.) |
| Front track | 1615 mm (63.58 in.) |
| Rear (Back) track | 1649 mm (64.92 in.) |
| Front overhang | 871 mm (34.29 in.) |
| Rear overhang | 1150 mm (45.28 in.) |
| Ride height (ground clearance) | 138 mm (5.43 in.) |
| Drag coefficient (Cd) | 0.25 |
| Minimum turning circle (turning diameter) | 12.3 m (40.35 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 | Double wishbone |
| 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 | 225/60 R17; 245/50 R18; 245/45 R19; 275/40 R19; 245/40 R20; 275/35 R20 |
| Wheel rims size | 7.5J x 17; 8J x 18; 8.5J x 19; 9.5J x 19; 8.5J x 20; 10J x 20 |
Powertrain & Engine Architecture
The heart of the 630d Steptronic is BMW’s B57D30A 3.0-liter inline-six diesel engine. This engine is a member of the modular BMW engine family, known for its robust construction and advanced technology. The B57 features a common-rail direct injection system operating at extremely high pressures (2,200 bar) for optimized fuel atomization and combustion efficiency. A twin-scroll turbocharger with variable geometry turbine (VGT) technology minimizes turbo lag and provides a broad torque curve. The engine also incorporates an intercooler to further enhance performance. The 630d utilizes BMW’s Steptronic eight-speed automatic transmission, renowned for its smooth shifts and efficiency. This transmission is electronically controlled and adapts to driving conditions, offering both automatic and manual shift modes. The transmission’s gear ratios are tuned for a balance of acceleration and fuel economy, with a relatively long final drive ratio to prioritize cruising comfort.
Driving Characteristics
The 630d Steptronic delivers a refined and comfortable driving experience. While not as overtly sporty as some of its gasoline-powered siblings, the 630d offers ample torque (457 lb-ft) from low engine speeds, providing effortless acceleration in everyday driving situations. The 0-60 mph time of around 5.8 seconds is respectable for a large Gran Turismo. The eight-speed automatic transmission contributes to smooth gear changes and helps to keep the engine operating within its optimal efficiency range. Compared to the more powerful 640d models, the 630d feels less urgent in its acceleration, but it offers a more relaxed and fuel-efficient driving experience. The steering is precise and well-weighted, providing good feedback to the driver. The suspension is tuned for comfort, absorbing bumps and imperfections in the road surface effectively.
Equipment & Trim Levels
The 630d Steptronic typically came well-equipped as standard. Common features included leather upholstery, power-adjustable front seats with memory function, a premium sound system, a navigation system, and a comprehensive suite of safety features such as automatic emergency braking, lane departure warning, and adaptive cruise control. Optional extras included upgraded leather trim, a panoramic sunroof, ventilated front seats, and a head-up display. Interior trim options ranged from fine wood veneers to aluminum accents, allowing buyers to personalize the cabin to their preferences. The dashboard layout is typical BMW, with a driver-focused design and intuitive controls.
Chassis & Braking
The 6 Series Gran Turismo utilizes a sophisticated chassis design. The front suspension features a double-wishbone setup, while the rear employs an independent multi-link suspension. This configuration provides a good balance of ride comfort and handling precision. The 630d is equipped with ventilated disc brakes on all four wheels, providing ample stopping power. Anti-lock braking system (ABS) and electronic stability control (ESC) are standard features, enhancing safety and control. The steering system is an electric power steering (EPS) unit, offering precise and responsive steering feel.
Market Reception & Comparison
The 630d Steptronic was generally well-received by automotive critics. It was praised for its refined engine, comfortable ride, and spacious interior. However, some reviewers noted that it lacked the outright sportiness of some of its competitors. Compared to the 640d, the 630d offered a more affordable entry point into the 6 Series Gran Turismo range, but it came with a trade-off in terms of performance. Fuel economy was a strong point for the 630d, consistently achieving around 48 mpg on the combined cycle. Reliability has been generally good, although diesel engines can be susceptible to issues with the diesel particulate filter (DPF) if not properly maintained.
Legacy
The BMW 6 Series Gran Turismo (G32) 630d Steptronic represents a compelling option for buyers seeking a luxurious and efficient grand tourer. The B57 diesel engine has proven to be a durable and reliable powerplant, and the eight-speed automatic transmission is known for its smooth operation. On the used car market, the 630d Steptronic offers good value for money, providing a high level of equipment and refinement at a competitive price. However, potential buyers should be aware of the potential maintenance costs associated with diesel engines, particularly the DPF and fuel injection system. Overall, the 630d Steptronic remains a desirable and capable vehicle for long-distance travel and everyday driving.
