The BMW 6 Series Gran Turismo (G32) 630i 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 slotted between the entry-level 630d and the higher-performance 640i and M6 variants. The 630i aimed to provide a balance of efficiency, comfort, and respectable performance for buyers prioritizing a refined driving experience over outright speed. It was primarily marketed in Europe and Asia, where the Gran Turismo format found greater acceptance than in the North American market.
Technical Specifications
| Brand | BMW |
| Model | 6 Series |
| Generation | 6 Series Gran Turismo (G32) |
| Type (Engine) | 630i (258 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 (economy) – urban | 7.8-8.2 l/100 km (30.2 – 28.7 US mpg, 36.2 – 34.4 UK mpg, 12.8 – 12.2 km/l) |
| Fuel consumption (economy) – extra urban | 5.3-5.8 l/100 km (44.4 – 40.6 US mpg, 53.3 – 48.7 UK mpg, 18.9 – 17.2 km/l) |
| Fuel consumption (economy) – combined | 6.2-6.6 l/100 km (37.9 – 35.6 US mpg, 45.6 – 42.8 UK mpg, 16.1 – 15.2 km/l) |
| CO2 emissions | 142-152 g/km |
| Fuel Type | Petrol (Gasoline) |
| Acceleration 0 – 100 km/h | 6.3 sec |
| Acceleration 0 – 62 mph | 6.3 sec |
| Acceleration 0 – 60 mph | 6 sec (Calculated) |
| Maximum speed | 250 km/h (155.34 mph) |
| Emission standard | Euro 6 |
| Weight-to-power ratio | 6.7 kg/Hp, 150 Hp/tonne |
| Weight-to-torque ratio | 4.3 kg/Nm, 232.6 Nm/tonne |
| Power | 258 Hp @ 5000-6500 rpm |
| Power per litre | 129.1 Hp/l |
| Torque | 400 Nm @ 1550-4400 rpm (295.02 lb.-ft. @ 1550-4400 rpm) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | B48B20B |
| Engine displacement | 1998 cm3 (121.93 cu. in.) |
| Number of cylinders | 4 |
| Engine configuration | Inline |
| Cylinder Bore | 82 mm (3.23 in.) |
| Piston Stroke | 94.6 mm (3.72 in.) |
| Compression ratio | 10.2:1 |
| Number of valves per cylinder | 4 |
| Fuel injection system | Direct injection |
| Engine aspiration | Twin-power turbo, Intercooler |
| Engine oil capacity | 5.25 l (5.55 US qt | 4.62 UK qt) |
| Coolant | 9.9 l (10.46 US qt | 8.71 UK qt) |
| Kerb Weight | 1720 kg (3791.95 lbs.) |
| Max. weight | 2380 kg (5247 lbs.) |
| Max load | 660 kg (1455.05 lbs.) |
| Trunk (boot) space – minimum | 610 l (21.54 cu. ft.) |
| Trunk (boot) space – maximum | 1800 l (63.57 cu. ft.) |
| Fuel tank capacity | 68 l (17.96 US gal | 14.96 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) | 0.26 |
| Minimum turning circle | 12.3 m (40.35 ft.) |
| Drivetrain Architecture | 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 630i is powered by BMW’s B48B20B 2.0-liter turbocharged inline-four cylinder engine. This engine is a member of BMW’s modular engine family, known for its efficiency and refinement. The ‘B48’ designation indicates the engine family, ‘B20’ signifies the displacement of 2.0 liters, and ‘B’ denotes the fuel type (gasoline). The engine utilizes direct fuel injection, delivering fuel directly into the combustion chamber for improved efficiency and reduced emissions. It also features BMW’s TwinPower Turbo technology, employing a twin-scroll turbocharger and an intercooler to enhance power output and responsiveness. The engine produces 258 horsepower at 5000-6500 rpm and 400 Nm (295 lb-ft) of torque between 1550-4400 rpm. The engine is paired with BMW’s 8-speed Steptronic automatic transmission, known for its smooth and quick shifts. This transmission features a torque converter and allows for both automatic and manual gear selection via steering wheel-mounted paddles.
Driving Characteristics
The 630i Steptronic offers a comfortable and refined driving experience. While not as overtly sporty as the 640i, the 2.0-liter engine provides adequate power for everyday driving and highway cruising. The 8-speed automatic transmission is well-tuned, providing smooth gear changes and contributing to the car’s overall refinement. Acceleration from 0-60 mph takes approximately 6 seconds. The Steptronic transmission’s gear ratios are optimized for both fuel efficiency and performance, with taller gears for relaxed cruising and shorter gears for quicker acceleration. Compared to the 640i, the 630i feels less urgent in its acceleration, but it offers a more fuel-efficient and relaxed driving experience. The rear-wheel-drive configuration provides a balanced feel, although it may not offer the same level of grip in adverse weather conditions as all-wheel-drive variants.
Equipment & Trim Levels
The 630i Steptronic came standard with a comprehensive list of features, including leather upholstery, power-adjustable front seats, a 10.25-inch infotainment system with iDrive controller, navigation, and a premium sound system. Standard safety features included automatic emergency braking, lane departure warning, and parking sensors. Optional extras included adaptive cruise control, a head-up display, panoramic sunroof, and upgraded interior trim options. Interior upholstery options typically included various leather colors and finishes. The dashboard layout was characterized by a clean and modern design, with a focus on user-friendliness.
Chassis & Braking
The 630i Gran Turismo utilizes a double-wishbone front suspension and an independent multi-link rear suspension, providing a comfortable and controlled ride. The suspension is tuned to prioritize comfort over outright sportiness. Braking duties are handled by ventilated disc brakes on all four wheels, providing ample stopping power. The car is equipped with ABS (Anti-lock Braking System) and electronic stability control to enhance safety. The steering system is an electric power steering system, offering precise and responsive steering feel.
Market Reception & Comparison
The 630i Steptronic was generally well-received by automotive critics, who praised its comfortable ride, refined interior, and fuel efficiency. However, some critics noted that the 2.0-liter engine lacked the punch of the larger engines offered in the 6 Series lineup. Compared to the 640i, the 630i offered a more affordable entry point into the 6 Series Gran Turismo range, but at the expense of performance. Fuel economy figures were competitive for its class, with combined fuel consumption ranging from 6.2 to 6.6 liters per 100 kilometers (37.9 to 35.6 US mpg). Reliability reports suggest that the B48 engine is generally reliable, although regular maintenance is essential.
Legacy
The BMW 6 Series Gran Turismo (G32) 630i Steptronic represents a unique offering in BMW’s lineup, combining the luxury and refinement of the 6 Series with the practicality of a Gran Turismo body style. While production ended in 2020, the 630i remains a popular choice in the used car market, offering a comfortable and well-equipped grand tourer at a relatively affordable price point. The B48 engine has proven to be a durable and reliable unit, and with proper maintenance, these vehicles are expected to provide many years of reliable service. Its blend of comfort, efficiency, and technology continues to appeal to buyers seeking a refined and practical luxury vehicle.
