BMW 635CSi
The BMW 635CSi is the flagship coupe of the legendary E24 6 Series — a grand touring classic powered by the M30 big six, offering long-legged continental cruising in a beautifully proportioned two-door body that defined BMW's premium coupe identity through the 1980s.
Overview
The BMW 635CSi (E24) ran from 1978 to 1989 as the range-topping 6 Series coupe — a genuine grand tourer built around the M30B34 or M30B35 3.5-litre naturally aspirated inline-six. In its final high-compression European form, the M30B35 produced up to 220 hp, giving the sleek E24 a 0–100 km/h time of around 7.5 seconds and a top speed beyond 230 km/h. The 635CSi was campaigned with success in Group A touring car racing in period, most notably by BMW Motorsport.
The E24 6 Series was designed by Paul Bracq and represents one of the most elegant BMW body designs ever produced — a long bonnet, short rear deck, and pillarless side windows that remain visually striking decades after production ended. The 635CSi was the most powerful regular production E24, sitting below the M635CSi (M88-engined, 286 hp) in the lineup. In period, it competed with the Mercedes-Benz SL and Jaguar XJS as a flagship grand tourer.
For Azerbaijan collectors, the E24 635CSi is a genuine investment-grade classic car. Values have been rising as the E24 generation achieves wider recognition as a design and engineering classic. Clean, well-maintained European examples command significant premiums. The M30 inline-six is robust and well-supported, and the E24 has a dedicated specialist community globally.
635CSi in Pictures
Exterior design, cabin layout, and real-world use reference images. Broken links gracefully fall back to text tiles.
Key Specifications
- Engine: M30B34 (185 hp, 1978–1982) or M30B35 (218–220 hp, 1982–1989)
- 0–100 km/h: 7.5 seconds (final M30B35 spec)
- Top speed: 233 km/h
- Transmission: 5-speed manual or 3/4-speed automatic
- Drivetrain: RWD
- Pillarless side windows — distinctive E24 design feature
- Wheelbase: 2,625 mm
- Available in European and US-spec (Eta variant for US)
Variant Comparison
| Variant | Engine | Power | 0–100 km/h | Best For |
|---|---|---|---|---|
| 633CSi | M30B32 3.2L I6 | 197 hp | 8.2 sec | Entry 6 Series coupe |
| 635CSi | M30B34/B35 3.5L I6 | 185–220 hp | 7.5 sec | Flagship 6 Series coupe |
| M635CSi | M88/3 3.5L I6 | 286 hp | 6.4 sec | M-car performance flagship |
Competitor Snapshot
Competitor choice in Azerbaijan should account not only for headline specs, but for service ecosystem, parts availability, and ownership confidence over your actual routes.
| Model | Core Strength | Main Compromise (Local Context) |
|---|---|---|
| Mercedes-Benz SL (R107) | V8 convertible prestige, excellent build longevity | Different concept — open-top vs coupe; less engaging to drive |
| Jaguar XJS HE (V12) | V12 grand tourer, distinctive styling | Parts very scarce in Azerbaijan; less mechanically accessible |
| Porsche 928 (S) | V8 front-engine GT, superior handling balance | Parts difficult in Azerbaijan; more complex mechanically |
| Alfa Romeo GTV6 | V6 character, handling, Italian style | Not a direct competitor in terms of size and luxury |
Repair & Service in Azerbaijan
BMW has an established service presence in Baku through authorised dealerships and independent specialists familiar with the brand. Parts supply for common maintenance items is generally reliable, though specialist components for performance models and older generations may require additional lead time.
- M30 timing chain: chain stretch and guide wear — inspect carefully on any high-mileage example
- Cooling system: water pump, thermostat, and all rubber hoses are primary service items
- Fuel injection (Bosch L-Jetronic): injectors and lambda sensor benefit from service on aged cars
- Rust prevention: E24 bodies can rust at the front floors, sills, and rear valance — protective coating essential
- Automatic gearbox (if fitted): ZF 3HP22 or 4HP22 fluid change every 40,000 km
- Electrical system: E24 wiring is now 35–45 years old; expect some harness inspection and potential repair
Ownership Cost Estimator (Azerbaijan)
Adjust these values for your driving profile. All figures are estimates for planning purposes only.
- Estimated annual fuel consumption: 650 L
- Estimated annual fuel cost: $455
- Total annual ownership estimate: $8155
- Average monthly ownership estimate: $680
- The 635CSi is a classic car requiring classic car ownership approach — not a daily driver proposition
- M30 inline-six is one of BMW's most durable engines — properly serviced examples last 300,000+ km
- Body panels: E24 specific body panels are increasingly difficult to source NOS — body condition is paramount
- Fuel consumption: 12–15 L/100km is expected for the 3.5L inline-six in mixed use
- Budget for specialist classic BMW expertise — general garages lack E24 knowledge
Used 635CSi Buying Checklist
Inspect each point thoroughly before committing to a purchase. Request service records, VIN validation, and any recall completion documentation.
- Rust inspection: thorough underbody, sill, front floor, and rear valance check — critical on any E24
- M30 health: compression test, oil condition check, and chain noise assessment at cold start
- Body panel availability: check any damaged or non-original panels — E24-specific parts are becoming scarce
- All electrical functions: windows, central locking (if fitted), instrument cluster, heating/ventilation
- Fuel injection system: run engine to full operating temp and check for any rough running or fuel smell
- Service history: documented specialist maintenance is key to confidence in an E24 purchase
- Interior condition: E24 cabins use specific materials — check leather, wood, and carpet for condition
- Tyre age and condition: check date codes and fitment sizes — some E24 sizes are specialist items
635CSi FAQ — Azerbaijan Buyers
Is the E24 635CSi a good collector car investment?
The E24 6 Series has seen consistent value growth in recent years, particularly for clean European examples with full history. The 635CSi in M30B35 high-specification form is the most sought-after standard production E24. M635CSi examples command multiples, but even standard 635CSi values are firm and rising. A clean, well-documented 635CSi is a sound collector investment.
How does the 635CSi compare to the 850i?
The 850i (E31) is a later, more powerful, and technologically advanced grand tourer. The 635CSi (E24) is purer in character — simpler mechanically, more analogue in feel, and with a design that many consider more elegant. The 850i is more valuable today due to V12 desirability; the 635CSi is more accessible in price and more usable as a regular classic. Both are outstanding BMWs.
Can the E24 635CSi be driven regularly today?
Yes — the M30 inline-six is straightforward and robust, the mechanical systems are accessible, and the driving experience remains rewarding. The 635CSi can be used for regular enjoyment runs and special occasions with an appropriate classic car maintenance approach. It is not a car for high annual mileage or neglect, but for the right owner it is a deeply enjoyable regular drive.
Should You Buy the BMW 635CSi?
The BMW E24 635CSi is a genuinely great grand touring car with a design and character that continues to attract appreciation. Values have been rising steadily, and clean, documented examples are increasingly rare. For a buyer in Azerbaijan who wants a historically significant, visually stunning, and genuinely rewarding BMW classic, the 635CSi is an outstanding choice — with the understanding that it requires specialist care and classic car commitment.
BakuWheels uses cookies to improve your experience, analyse site traffic, and personalise content. By clicking Accept All, you consent to our use of cookies. Learn more in our Cookie Policy.