The BMW 6 Series Convertible (E64) 630i, produced from 2004 to 2007, represented BMW’s entry point into the luxurious and performance-oriented convertible market. Positioned within the E64 generation – which itself was the first open-top 6 Series since the iconic E9 – the 630i offered a blend of refinement, respectable power, and the open-air driving experience BMW was known for. It served as the more accessible variant, sitting below the more potent 645Ci and later 650i models. The E64 platform shared its underpinnings with the E63 6 Series Coupe and utilized BMW’s then-current design language, characterized by Chris Bangle’s controversial yet distinctive styling cues.
Technical Specifications
| Brand | BMW |
| Model | 6 Series |
| Generation | 6 Series Convertible (E64) |
| Type (Engine) | 630i (258 Hp) |
| Start of production | 2004 |
| End of production | 2007 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Cabriolet |
| Seats | 4 |
| Doors | 2 |
| Fuel consumption (urban) | 13.6 l/100 km (17.3 US mpg, 20.8 UK mpg) |
| Fuel consumption (extra urban) | 7.3 l/100 km (32.2 US mpg, 38.7 UK mpg) |
| Fuel consumption (combined) | 9.6 l/100 km (24.5 US mpg, 29.4 UK mpg) |
| Fuel Type | Petrol (Gasoline) |
| Acceleration 0 – 100 km/h | 6.9 sec |
| Acceleration 0 – 62 mph | 6.9 sec |
| Acceleration 0 – 60 mph | 6.6 sec |
| Maximum speed | 250 km/h (155.34 mph) |
| Emission standard | Euro 4 |
| Weight-to-power ratio | 6.5 kg/Hp |
| Weight-to-torque ratio | 5.6 kg/Nm |
| Power | 258 Hp @ 6600 rpm |
| Torque | 300 Nm @ 2500 rpm (221.27 lb.-ft. @ 2500 rpm) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | N52B30A |
| Engine displacement | 2996 cm3 (182.83 cu. in.) |
| Number of cylinders | 6 |
| Engine configuration | Inline |
| Cylinder Bore | 85 mm (3.35 in.) |
| Piston Stroke | 88 mm (3.46 in.) |
| Compression ratio | 10.7:1 |
| Number of valves per cylinder | 4 |
| Fuel injection system | Multi-port manifold injection |
| Engine aspiration | Naturally aspirated engine |
| Valvetrain | DOHC |
| Engine oil capacity | 6.5 l (6.87 US qt | 5.72 UK qt) |
| Kerb Weight | 1685 kg (3714.79 lbs.) |
| Max. weight | 2085 kg (4596.64 lbs.) |
| Max load | 400 kg (881.85 lbs.) |
| Trunk (boot) space – minimum | 300 l (10.59 cu. ft.) |
| Trunk (boot) space – maximum | 350 l (12.36 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 | 1373 mm (54.06 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) | 0.31 |
| Minimum turning circle | 11.4 m (37.4 ft.) |
| Drivetrain Architecture | Rear wheel drive |
| Drive wheel | Rear wheel drive |
| Number of gears | 6 |
| Front suspension | Coil spring |
| Rear suspension | Coil spring |
| Front brakes | Ventilated discs |
| Rear brakes | Disc |
| Assisting systems | ABS (Anti-lock braking system) |
| Steering type | Steering rack and pinion |
| Power steering | Hydraulic Steering |
| Tires size | 245/40 R17 |
| Wheel rims size | 17 |
Powertrain & Engine Architecture
The 630i was powered by BMW’s N52B30A engine, a 3.0-liter naturally aspirated inline-six. This engine was a significant evolution of the previous M54 series, incorporating features like magnesium alloy construction for the engine block, double VANOS variable valve timing (for both intake and exhaust camshafts), and a more efficient combustion chamber design. The N52 utilized a multi-port fuel injection system, delivering fuel directly into the intake ports. The engine produced 258 horsepower at 6600 rpm and 221 lb-ft of torque at 2500 rpm. While not as powerful as the V8 engines offered in the 645Ci and 650i, the N52 was known for its smooth power delivery and responsiveness. The 630i was typically equipped with a 6-speed automatic transmission, although a 6-speed manual was also available. The automatic transmission was designed to provide smooth shifts and contribute to the car’s overall refinement.
Driving Characteristics
The 630i, with its 3.0-liter engine and automatic transmission, offered a comfortable and refined driving experience. Acceleration from 0 to 60 mph took around 6.6 seconds, which was respectable for the time but noticeably slower than the 645Ci. The automatic transmission, while smooth, could sometimes feel hesitant during quick downshifts. The gear ratios were tuned for a balance of fuel efficiency and acceptable performance. Compared to the manual transmission version, the automatic offered greater ease of use, particularly in city driving, but at the expense of some driver engagement. The inline-six engine provided a pleasing exhaust note and a linear power curve, making it easy to modulate throttle inputs. The car’s weight distribution, combined with the well-tuned suspension, resulted in predictable handling and a comfortable ride.
Equipment & Trim Levels
The 630i came standard with a generous array of features, including leather upholstery, power-adjustable seats, automatic climate control, a premium sound system, and xenon headlights. Optional extras included features like active steering, sport seats, a navigation system, and a logic7 surround sound system. Interior trim options included various wood veneers and aluminum accents. The convertible top was a multi-layer fabric design with a glass rear window and could be raised or lowered electronically. The standard dashboard configuration featured analog gauges with a central information display. The 630i was positioned as a more accessible entry point into the 6 Series range, offering a luxurious experience without the higher price tag of the more powerful models.
Chassis & Braking
The E64 630i utilized a MacPherson strut front suspension and a multi-link rear suspension, providing a comfortable ride and good handling characteristics. The suspension was tuned to balance comfort and performance, offering a compliant ride over uneven surfaces while maintaining good body control during cornering. The braking system consisted of ventilated discs at the front and solid discs at the rear. Anti-lock brakes (ABS) were standard, as was electronic brake-force distribution (EBD). The steering was a hydraulic power-assisted rack-and-pinion system, providing precise and responsive steering feel. The car rode on 17-inch alloy wheels with 245/40 R17 tires.
Market Reception & Comparison
Critics generally praised the 630i for its stylish design, luxurious interior, and comfortable ride. However, some reviewers noted that the engine lacked the outright performance of the 645Ci and 650i. Fuel economy was considered reasonable for a vehicle of its size and class, averaging around 24.5 mpg combined. Compared to the 645Ci, the 630i offered a lower purchase price and slightly better fuel economy, but at the cost of performance. The 630i appealed to buyers who prioritized comfort and style over outright speed. Reliability was generally good, although some owners reported issues with the electronic systems and convertible top mechanism.
Legacy
The BMW E64 630i remains a desirable used car today, particularly for those seeking a stylish and comfortable convertible. The N52 engine is generally considered to be a reliable unit, although regular maintenance is essential. Common issues include oil leaks, VANOS system problems, and cooling system failures. The automatic transmission is generally durable, but fluid changes should be performed according to the manufacturer’s recommendations. The E64 630i offers a unique blend of luxury, performance, and open-air driving enjoyment, making it a compelling choice for enthusiasts and collectors alike. Its relative affordability compared to the higher-spec 6 Series models has helped maintain its popularity in the used car market.
