The BMW M6 Convertible (E64 LCI), specifically the facelifted version produced from 2007 to 2010, represents the high-performance, open-top iteration of BMW’s flagship 6-Series. Powered by the naturally aspirated S85 5.0-liter V10 engine producing 507 horsepower, and paired with a 7-speed Sequential Manual Gearbox (SMG), this variant aimed to deliver an unparalleled grand touring experience. The “LCI” (Life Cycle Impulse) facelift brought subtle styling revisions, primarily to the front and rear fascias, along with interior enhancements. This model occupied the top echelon of the 6-Series range, offering a blend of luxury, performance, and exclusivity.
Technical Specifications
| Brand | BMW |
| Model | M6 |
| Generation | M6 Convertible (E64 LCI, facelift 2007) |
| Type (Engine) | 5.0 V10 (507 Hp) SMG |
| Start of production | 2007 |
| End of production | 2010 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Cabriolet |
| Seats | 4 |
| Doors | 2 |
| Fuel consumption (economy) – urban (NEDC) | 22 l/100 km (10.7 US mpg, 12.8 UK mpg, 4.5 km/l) |
| Fuel consumption (economy) – extra urban (NEDC) | 10.6 l/100 km (22.2 US mpg, 26.6 UK mpg, 9.4 km/l) |
| Fuel consumption (economy) – combined (NEDC) | 14.7 l/100 km (16 US mpg, 19.2 UK mpg, 6.8 km/l) |
| CO2 emissions (NEDC) | 352 g/km |
| Fuel Type | Petrol (Gasoline) |
| 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), Electronically limited |
| Emission standard | Euro 4 |
| Weight-to-power ratio | 3.8 kg/Hp, 262.7 Hp/tonne |
| Weight-to-torque ratio | 3.7 kg/Nm, 269.4 Nm/tonne |
| Power | 507 Hp @ 7750 rpm |
| Power per litre | 101.4 Hp/l |
| Torque | 520 Nm @ 6100 rpm (383.53 lb.-ft. @ 6100 rpm) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | S85B50A |
| Engine displacement | 4999 cm3 (305.06 cu. in.) |
| Number of cylinders | 10 |
| Engine configuration | V-engine |
| Cylinder Bore | 92 mm (3.62 in.) |
| Piston Stroke | 75.2 mm (2.96 in.) |
| Compression ratio | 12:1 |
| Number of valves per cylinder | 4 |
| Fuel injection system | Multi-port manifold injection |
| Engine aspiration | Naturally aspirated engine |
| Valvetrain | DOHC, Double-VANOS |
| Engine oil capacity | 9.3 l (9.83 US qt | 8.18 UK qt) |
| Coolant | 15 l (15.85 US qt | 13.2 UK qt) |
| Kerb Weight | 1930 kg (4254.92 lbs.) |
| Max. weight | 2380 kg (5247 lbs.) |
| Max load | 450 kg (992.08 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 | 4871 mm (191.77 in.) |
| Width | 1855 mm (73.03 in.) |
| Width including mirrors | 2043 mm (80.43 in.) |
| Height | 1377 mm (54.21 in.) |
| Wheelbase | 2781 mm (109.49 in.) |
| Front track | 1567 mm (61.69 in.) |
| Rear (Back) track | 1584 mm (62.36 in.) |
| Front overhang | 960 mm (37.8 in.) |
| Rear overhang | 1130 mm (44.49 in.) |
| Drag coefficient (Cd) | 0.34 |
| Minimum turning circle | 12.5 m (41.01 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 | 7 gears, automatic transmission SMG |
| Front suspension | Spring Strut, Transverse stabilizer |
| Rear suspension | Independent multi-link spring suspension with stabilizer |
| Front brakes | Ventilated discs, 374×36 mm |
| Rear brakes | Ventilated discs, 370×24 mm |
| Assisting systems | ABS (Anti-lock braking system) |
| Steering type | Steering rack and pinion |
| Power steering | Hydraulic Steering |
| Tires size | Front wheel tires: 255/40 ZR19 Rear wheel tires: 285/35 ZR19 |
| Wheel rims size | Front wheel rims: 8.5J x 19 Rear wheel rims: 9.5J x 19 |
Powertrain & Engine Architecture
The heart of the M6 Convertible LCI is the S85B50A 5.0-liter naturally aspirated V10 engine. This engine, derived from the powerplant used in the E60 M5, is notable for its high-revving nature and linear power delivery. It features individual throttle bodies for each cylinder, a high 12:1 compression ratio, and BMW’s Double-VANOS variable valve timing system on both intake and exhaust camshafts. Fuel is delivered via multi-port fuel injection. The engine produces 507 hp at 7,750 rpm and 383 lb-ft of torque at 6,100 rpm. The SMG (Sequential Manual Gearbox) is a 7-speed automated manual transmission. It allows for both fully automatic operation and manual gear changes via steering wheel-mounted paddles. The SMG utilizes a single clutch and is known for its quick shifts, but can sometimes exhibit jerkiness at low speeds.
Driving Characteristics
The M6 Convertible LCI with the SMG transmission offers a unique driving experience. While the SMG provides rapid gear changes, it lacks the smoothness of a traditional torque-converter automatic. In automatic mode, the transmission can be hesitant at times, particularly during low-speed maneuvers. However, in manual mode, the driver has full control over gear selection, allowing for precise and engaging driving. The V10 engine delivers a broad powerband, with strong acceleration throughout the rev range. The car feels planted and stable at high speeds, thanks to its well-tuned suspension and wide track. Compared to the standard 6-Series convertibles, the M6 offers significantly more performance and a more focused driving experience. It differs from the standard 650i in terms of its engine, transmission, suspension, brakes, and overall performance capabilities.
Equipment & Trim Levels
The M6 Convertible LCI came standard with a comprehensive list of features, including leather upholstery, power-adjustable heated seats, a premium sound system, automatic climate control, and a navigation system. The interior trim was typically finished with carbon fiber accents. Optional extras included upgraded leather, a head-up display, and active roll stabilization. The exterior featured unique aerodynamic styling elements, including a front splitter, side skirts, and a rear diffuser. Standard wheels were 19-inch alloy wheels, and various finishes were available.
Chassis & Braking
The M6 Convertible LCI features a reinforced chassis and a sport-tuned suspension. The front suspension utilizes a spring strut design with a transverse stabilizer bar, while the rear suspension employs an independent multi-link setup with a stabilizer bar. The braking system consists of ventilated discs at all four corners, with larger rotors and multi-piston calipers compared to the standard 6-Series. ABS (Anti-lock Braking System) is standard. The car’s suspension is firmer than that of the standard 6-Series, providing improved handling and stability, but at the expense of some ride comfort.
Market Reception & Comparison
The M6 Convertible LCI was generally well-received by automotive critics, who praised its performance, handling, and luxurious interior. However, the SMG transmission was a point of contention for some reviewers, who found it to be less refined than traditional automatic transmissions. Fuel economy was also a concern, with the M6 returning relatively poor gas mileage. Compared to other high-performance convertibles of the time, such as the Porsche 911 Cabriolet, the M6 offered a more comfortable and luxurious driving experience, but lacked the same level of track-focused performance.
Legacy
The BMW M6 Convertible (E64 LCI) remains a desirable vehicle among enthusiasts. The S85 V10 engine is highly regarded for its unique sound and performance characteristics. While the SMG transmission can be a maintenance concern, the engine itself is generally considered to be reliable if properly maintained. Today, well-maintained examples of the M6 Convertible LCI command a premium in the used car market, appealing to collectors and drivers seeking a high-performance, open-top grand tourer.
