The BMW 635d Steptronic, produced from 2007 to 2010, represents a significant offering within the E63 generation of the 6 Series. This variant, a two-door coupe seating four, was positioned as a high-performance, diesel-powered grand tourer. Introduced during the facelift of the E63 series, it aimed to blend luxury, performance, and improved fuel efficiency, appealing to buyers seeking a sophisticated alternative to traditional gasoline-powered coupes. The 635d utilized BMW’s advanced diesel technology and a six-speed automatic transmission, offering a unique driving experience within the 6 Series lineup.
Technical Specifications
| Brand | BMW |
| Model | 6 Series |
| Generation | 6 Series (E63, facelift 2007) |
| Type (Engine) | 635d (286 Hp) Steptronic |
| Start of production | 2007 |
| End of production | 2010 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Coupe |
| Seats | 4 |
| Doors | 2 |
| Fuel consumption (urban) | 9.2 l/100 km (25.6 US mpg) |
| Fuel consumption (extra urban) | 5.6 l/100 km (42 US mpg) |
| Fuel consumption (combined) | 6.9 l/100 km (34.1 US mpg) |
| CO2 emissions | 183 g/km |
| Fuel Type | Diesel |
| Acceleration 0 – 100 km/h | 6.3 sec |
| Acceleration 0 – 62 mph | 6.3 sec |
| Acceleration 0 – 60 mph | 6 sec |
| Maximum speed | 250 km/h (155.34 mph) |
| Emission standard | Euro 4 |
| Weight-to-power ratio | 5.8 kg/Hp |
| Weight-to-torque ratio | 2.8 kg/Nm |
| Power | 286 Hp @ 4400 rpm |
| Torque | 580 Nm @ 1750-2250 rpm (427.79 lb.-ft.) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | M57D30 |
| 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 | 17:1 |
| Number of valves per cylinder | 4 |
| Fuel injection system | Diesel Commonrail |
| Engine aspiration | Turbocharger, Intercooler |
| Engine oil capacity | 7.7 l (8.14 US qt | 6.78 UK qt) |
| Coolant | 8.2 l (8.66 US qt | 7.21 UK qt) |
| Kerb Weight | 1650 kg (3637.63 lbs.) |
| Max. weight | 2100 kg (4629.71 lbs.) |
| Max load | 450 kg (992.08 lbs.) |
| Trunk (boot) space – minimum | 450 l (15.89 cu. ft.) |
| Fuel tank capacity | 70 l (18.49 US gal | 15.4 UK gal) |
| Length | 4820 mm (189.76 in.) |
| Width | 1855 mm (73.03 in.) |
| Height | 1374 mm (54.09 in.) |
| Wheelbase | 2780 mm (109.45 in.) |
| Front track | 1558 mm (61.34 in.) |
| Rear (Back) track | 1596 mm (62.83 in.) |
| Drag coefficient (Cd) | 0.30 |
| Minimum turning circle | 11.4 m (37.4 ft.) |
| Drivetrain Architecture | Rear wheel drive |
| Number of gears | 6 |
| Gearbox type | Automatic transmission |
| 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 | Hydraulic Steering |
| Tires size | 245/50 R17 99W RSC |
| Wheel rims size | 7.5 J x 17 |
Powertrain & Engine Architecture
The heart of the 635d Steptronic is BMW’s M57D30 engine, a 3.0-liter inline-six diesel. This engine, a product of BMW’s extensive diesel development program, featured common rail direct injection, a variable geometry turbocharger, and an intercooler. The common rail system allowed for precise fuel delivery at high pressures, optimizing combustion efficiency and reducing emissions. The turbocharger, with its variable geometry vanes, provided a broad torque curve and minimized turbo lag. The M57D30 produced 286 horsepower at 4400 rpm and a substantial 580 Nm (427.79 lb-ft) of torque between 1750 and 2250 rpm. This torque output was a key characteristic of the engine, providing strong acceleration in real-world driving conditions. The engine was paired with a six-speed Steptronic automatic transmission, offering smooth and responsive gear changes. This transmission was designed to handle the high torque output of the diesel engine and provide a comfortable driving experience.
Driving Characteristics
The 635d Steptronic offered a unique blend of performance and efficiency. The high torque output of the diesel engine meant that the car felt strong and responsive at all speeds. Acceleration from a standstill to 60 mph took approximately 6 seconds, and the car could reach a top speed of 155 mph (limited). While not as outright sporty as the 635i with its gasoline engine, the 635d provided ample power for comfortable and confident cruising. The automatic transmission contributed to a relaxed driving experience, particularly on long journeys. The gear ratios were optimized for both fuel efficiency and performance, allowing the engine to operate in its sweet spot for most of the time. Compared to the manual transmission versions of the 635d, the Steptronic offered greater convenience, but some enthusiasts felt that it lacked the engagement of a manual gearbox.
Equipment & Trim Levels
The 635d Steptronic typically came well-equipped as standard. Features included leather upholstery, automatic climate control, a premium sound system, and a host of safety features such as ABS, traction control, and stability control. Optional extras included features like active steering, adaptive suspension, heated seats, and a navigation system. The interior design was luxurious and refined, with high-quality materials and a driver-focused layout. The dashboard featured a classic BMW design, with clear and easy-to-read gauges. The trim levels offered allowed buyers to customize their vehicle with a range of options, enhancing the overall luxury and comfort.
Chassis & Braking
The E63 6 Series featured a sophisticated chassis design, with a double wishbone front suspension and an independent multi-link rear suspension. This setup provided a comfortable ride and precise handling. The 635d Steptronic was equipped with ventilated disc brakes on all four wheels, providing ample stopping power. ABS (Anti-lock Braking System) was standard, enhancing safety and stability during braking. The steering was a rack-and-pinion system with hydraulic power assistance, offering precise and responsive steering feel. The suspension was tuned to balance comfort and handling, providing a stable and confident driving experience.
Market Reception & Comparison
The 635d Steptronic was generally well-received by automotive critics. It was praised for its strong performance, excellent fuel economy, and luxurious interior. However, some critics noted that the diesel engine lacked the refinement and sound of a gasoline engine. Compared to the 635i, the 635d offered better fuel economy and more torque, but it was slightly slower in acceleration. The 630d, a lower-powered diesel variant, offered a more affordable entry point into the 6 Series range, but it lacked the performance of the 635d. The 635d appealed to buyers who prioritized fuel efficiency and torque over outright speed and sound.
Legacy
The BMW 635d Steptronic, while not as iconic as some of its gasoline-powered siblings, remains a desirable grand tourer in the used car market. The M57D30 engine is known for its reliability and durability, provided it is properly maintained. Regular servicing, including oil changes and filter replacements, is crucial for ensuring the long-term health of the engine. The automatic transmission is also generally reliable, but it may require servicing at higher mileages. Today, the 635d Steptronic offers a unique combination of performance, efficiency, and luxury, making it an attractive option for buyers seeking a sophisticated and capable coupe.
