Powertrain families
N52/N53 petrol I6 · N62 petrol V8 · N54 petrol I6 · M57 diesel I6
6 Series (E63/E64) — Cabriolet
2003–2010
Editorially reviewedReviewed 2026-08-10; market and model-year scope is stated in the record sources.
- Internal code
- E64
- Production
- 2003–2010
- Body style
- 2-door convertible
- Platform
- longitudinal layout · rear-wheel drive
Body variants
6 Series → E63/E64 → Cabriolet
6 Series E63/E64: history, design and engineering
How this generation came about, what made it different and how the selected cabriolet fits into the family.
E63/E64 revived the 6 Series after a fourteen-year gap. E63 is the fixed-roof coupe launched in 2003, while E64 is the separately reinforced four-seat convertible with a powered fabric roof and distinctive vertical rear window; both use contemporary 5 Series-related electronics and chassis engineering in their own grand-touring bodies.
The regular range evolved from the V8 645Ci and six-cylinder 630i to the 650i, diesel 635d and market-specific 630d. Engine codes, outputs and even model names differ by date and region, so the entire 2003–2010 generation cannot be described by one late brochure.
A 2007 lifecycle revision updated styling, controls, lighting and powertrain details. E63/E64 M6 derivatives use the S85 V10 and form a separate BMW M record; the regular 6 Series catalog should cross-link them without inserting M6 data into ordinary coupe or convertible specifications.
2003–2010generation lifecycle
2body branches
4engine/drive families
5range designations
E63/E64factory code
longitudinal layout · rear-wheel drivearchitecture
Cabriolet: dimensions and packaging
Dimensions can change with body, market and model year, so this page keeps them tied to the exact factory branch.
Length4,820 mm
Width1,855 mm
Height1,373 mm
Wheelbase2,780 mm
Luggage300–350 L
Fuel tank70 L
Seats4
Doors2-door convertible
Engines and powertrains
The generation could span very different engines and drivetrains. The table keeps output, gearbox, market and production period together.
Factory modification matrix
Documented cabriolet applications; output and availability remain market- and model-year-specific.
| Model | Years | Engine | Output | Transmission | Drive | Market | Source |
|---|---|---|---|---|---|---|---|
| 630i | 2004–2010 | N52B30 / N53B30 inline-six | 258–272 PS | 6MT / 6AT / SMG | RWD | Global range | 2005 BMW 6 Series press kit |
| 645Ci | 2003–2005 | N62B44 V8 | 333 PS | 6MT / 6AT / SMG | RWD | Global range | The new BMW 6 Series Convertible |
| 650i | 2005–2010 | N62B48 V8 | 367 PS | 6MT / 6AT / SMG | RWD | Global range | 2005 BMW 6 Series press kit |
| 630d | 2004–2007 | M57D30 diesel inline-six | 218–231 PS | 6MT / 6AT | RWD | Europe | 2005 BMW 6 Series press kit |
| 635d | 2007–2010 | M57D30 twin-turbo diesel inline-six | 286 PS | 6AT | RWD | Europe | 2005 BMW 6 Series press kit |
Factory designations
630i · 645Ci · 650i · 630d · 635d
Petrol engines
Inline and V engines are grouped by engine family, displacement, induction system and emissions specification.
Diesel derivatives
Where diesels were offered, output, injection generation and emissions hardware are recorded market by market.
How power reaches the road
Gearboxes, driven wheels and final-drive hardware changed with engine, market and production date.
Transmissions
Gearbox type and unit code follow engine, market and production date. Gear count alone does not identify the transmission.
Driven wheels
Catalog architecture: longitudinal layout · rear-wheel drive. All-wheel-drive availability and hardware remain derivative-specific.
Final drive
Ratio, differential type and electronic control belong to the exact derivative and can differ on performance models.
What changed underneath
Suspension, brakes, safety systems and electronics evolved across the range, even when cars shared the same basic architecture.
Body-branch dimensions
- E63: 4,820 mm × 1,855 mm × 1,374 mm
- E64: 4,820 mm × 1,855 mm × 1,373 mm
Body & suspension
- Mounting points and geometry follow the body branch
- Springs and dampers follow axle load and chassis package
- Wheels and permitted loads follow the factory label
Brakes & steering
- Brake size follows engine and equipment
- Assistance type and steering ratio can change
- ABS/DSC generation follows model year
Passive safety
- Airbag count varies by market and year
- SRS parts are VIN-specific
- Structural repairs require factory procedures
Electronics
- Vehicle-bus generations changed during production
- Control-unit software levels must remain compatible
- Retrofits are recorded separately from factory equipment
How the generation evolved
The important launches, additions and updates did not always happen at the same time for every body or market.
6 Series returns as E63
The new coupe reintroduced the 6 Series name with 645Ci as the initial lead derivative.
E64 convertible
The soft-top body joined with separate reinforcement, rollover protection and luggage packaging.
Range expansion
630i, 650i and M6-era derivatives broadened the engine and market structure.
Lifecycle revision
Both bodies received coordinated visual, equipment and powertrain changes.
Production closes
E63/E64 production ended before the F12 convertible opened the next generation.
The versions that stood apart
Performance models, option packages and regional editions may look related, but their engineering and production identity can be very different.
Coupe
E636 Series E63 is a distinct E63/E64 body branch. A lower-roof two-door body with longer doors and a more overtly sporting brief than the corresponding sedan. Engines/drive: N52/N53 petrol I6, N62 petrol V8, N54 petrol I6, M57 diesel I6.
Cabriolet
E646 Series E64 is a distinct E63/E64 body branch. An open body with a folding roof and generation-specific structural reinforcement, seating and luggage packaging. Engines/drive: N52/N53 petrol I6, N62 petrol V8, N54 petrol I6, M57 diesel I6.
Inside the car
Cabin technology and standard equipment changed by country and year; a build sheet remains the best guide to one individual car.
Cabin & comfort
- Trim and seats follow option codes
- Climate systems vary by market
- Audio and navigation changed by model year
Lighting & assistance
- Lamp technology and modules follow production date
- Driver assistance cannot be inferred from buttons alone
- Regional rules affect lighting and warnings
What to check today
A practical starting point for inspecting and maintaining a car from this generation — not a diagnosis of an individual example.
Identify first
- Match VIN on body and documents
- Obtain the factory option list
- Confirm market and production date
Inspect the structure
- Check repairs and corrosion
- Assess suspension, brakes and tyres
- Compare fitted parts with factory specification
Mechanical history
- Read faults with compatible diagnostics
- Verify engine and transmission maintenance
- Separate invoices from unsupported verbal history
| Item | Interval / trigger | Catalog note |
|---|---|---|
| Engine oil & filter | CBS/factory schedule; time and mileage for historic cars | Oil approval follows the exact engine and market. |
| Brake fluid | Time-based factory schedule | ABS/DSC-compatible bleeding procedure is required after hydraulic work. |
| Coolant | Factory schedule and condition | Fluid specification and bleeding method are generation-specific. |
| Transmission & final drives | Unit type and operating conditions | Use the exact approved fluid; no one interval fits every derivative. |
How to identify the exact car
The badge and registration year tell only part of the story; production date, body code, engine and factory options complete it.
- Factory body codes
- E63 — Coupe; E64 — Cabriolet
- Range designations
- 630i, 645Ci, 650i, 630d, 635d
- Powertrain families
- N52/N53 petrol I6, N62 petrol V8, N54 petrol I6, M57 diesel I6
- VIN
- Identifies model, plant and production branch and keys the parts catalog and factory equipment record.
- Production date
- More useful than first-registration year when choosing parts and locating technical revisions.
- Type code
- Refines engine, body, market and transmission combination.
- Option codes
- Confirm factory equipment; later retrofits are recorded separately.
- Unit number
- Supports engine or gearbox originality checks and component applicability.
Where the information comes from
The story is mapped through English Wikipedia and its bibliography, then important dates and technical claims are checked against BMW material.
- 01BMW 6 Series (E63)Wikipedia contributors
Secondary E63/E64 body, engine, production and lifecycle overview.
- 022005 BMW 6 Series press kitBMW Group PressClub
Factory coupe/convertible engineering, equipment and contemporary model-range documentation.
- 03The new BMW 6 Series ConvertibleBMW Group PressClub
Factory description of the E64 body, roof, reinforcement and launch specification.
Notes and limitations
- Research revision dated 2026-08-10: English Wikipedia was used as a subject and bibliography map; key claims were checked against the listed primary BMW Group material.
- E63 coupe and E64 convertible require separate dimensions, luggage figures and production dates even where engines share badges.
- M6 E63/E64 is cross-linked but not merged; diesel availability and transmission choices also need market-level validation.
- Tree years describe the worldwide generation lifecycle; individual market dates may be narrower.
- Exact dimensions, power, weight and emissions belong at body, engine, market and model-year level.
- Known-issue guidance is editorial context and never replaces inspection of the individual vehicle.
3 primary references · market differences documentedPhotography: Charles from Port Chester, New York, CC0 · Wikimedia Commons. Rights checked 2026-08-06; wikimedia commons 1,800 px derivative downloaded; local 640 px and 1,280 px avif versions created without cropping.Updated 6 August 2026