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BMW Group Classic lists the 840Ci with either the 4.0-liter M60B40 or the later 4.4-liter M62B44, both rated at 286 hp. Torque rises from 400 Nm to 420 Nm with the later engine. BMW M describes the 850CSi’s 5.6-liter S70 V12 as producing 280 kW (380 hp). Those are the core differences; use the individual car’s identifying information to confirm which version you are evaluating.
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At a glance: the meaningful differences
The table below separates documented specifications from buying advice. It is a starting point, not a substitute for checking a particular car’s build records.
| Decision axis | BMW 840Ci | BMW 850CSi | What it means for a buyer |
|---|---|---|---|
| Engine | 4.0-liter M60B40, then 4.4-liter M62B44 | 5.6-liter S70 V12 | Confirm the engine installed and the build date; 840Ci output stayed at 286 hp while torque increased on the M62 version. |
| Published output | 286 hp and 400 Nm (M60); 286 hp and 420 Nm (M62) | 280 kW (380 hp) | Figures come from BMW historical material and are not a back-to-back road test. |
| Chassis and equipment | Equipment varies by year and market | BMW CCA documents CSi-specific suspension calibration, wider tires, steering and other changes | Inspect the actual equipment rather than assuming every car has the same specification. |
| Model identity | E31 V8 model | BMW M-developed E31 performance variant | Do not confuse the CSi with the 850Ci, which uses a different 5.4-liter V12. |
| Best fit | Buyer seeking the V8 E31 configuration | Buyer specifically seeking the CSi engine and chassis specification | Condition, documentation, originality and intended use should decide between real examples. |
What the BMW 840Ci actually is
The early 4.0-liter 840Ci
BMW Group Classic records 840Ci production from July 1993 to May 1999. The earlier car uses the 4.0-liter M60B40 V8, rated at 286 hp and 400 Nm. That makes the 840Ci a genuine V8 alternative within the E31 range, not a lower-output version of a V12 model.
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When comparing advertisements, ask for the engine code or factory build information instead of relying on a registration year. A car registered later may have been built earlier, and market-specific equipment can differ. The BMW Group Classic page is the right historical reference for the model, but its content notes that AI was used in creating the page; treat its listed figures as a guide and corroborate an individual vehicle’s data with its records.
The later 4.4-liter 840Ci
BMW Group Classic says an advanced 4.4-liter M62B44 entered series production in 1996. The later engine is also listed at 286 hp, but torque increases to 420 Nm. That distinction matters because two cars both advertised as “286-hp 840Ci” can have different engines and torque outputs.
Do not infer the engine solely from a seller’s description such as “late model” or “facelift.” Check the build date, VIN documentation, engine identification and service invoices. If an engine has been replaced, record what is currently installed and whether the conversion is documented; a model designation alone cannot establish originality.
What makes the BMW 850CSi different
The S70 V12
BMW M’s historical account explains that the 850CSi developed the M70’s bore and stroke into a 5.6-liter S70 V12. BMW M gives production output as 280 kW, or 380 hp. This is a different engine specification from both 840Ci V8s and the regular 850Ci V12.
The CSi therefore represents more than an engine-size upgrade. It is the E31 variant to consider when the point of ownership is the specific BMW M-developed powertrain and the accompanying chassis specification. The documented output is a historical production figure, not a promise about what a modified or poorly maintained car will deliver today.
Suspension, tires, steering and equipment
The BMW Car Club of America’s E31 year-to-year guide describes CSi-specific changes including lowered and specially calibrated M suspension, wider tires, steering changes and additional equipment. That club guide is useful technical context, but it is written from a North American perspective and should not be generalized to every market or production year.
Use the guide to create an inspection checklist, then verify each item on the car. Look for evidence of the correct suspension components, wheel and tire specification, steering hardware and interior or exterior equipment. A car with swapped wheels, replacement suspension or missing original equipment may still be desirable, but it should be described accurately and valued according to its actual specification rather than its badges.
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Do not confuse the 850CSi with the 850Ci
The names are close, but the cars are not interchangeable. BMW Group Classic identifies the later 850Ci as the 5.4-liter M73 V12 variant, rated at 326 hp and 490 Nm. The CSi uses the 5.6-liter S70 V12 and is the BMW M-developed performance model. An advertisement that says only “850” is incomplete; ask whether it is an 850i, 850Ci or 850CSi.
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This distinction also prevents an easy specification error: the 850Ci’s 326-hp figure belongs to the M73-powered car, not to the 850CSi. Confirm the engine code, displacement and factory model designation before comparing output or equipment.
Where the cars sit in E31 history
The E31 began with the 850i. BMW Group Press records the original 5.0-liter V12 at 300 hp and 450 Nm, with a published 0–100 km/h time of 6.8 seconds for the 1,790-kg 2+2. The 840Ci joined the lineup in 1993. These figures provide historical context for the range; they are not a direct, independently measured 840Ci-versus-850CSi comparison.
Thinking of the E31 as a family helps explain the badges. The 840Ci is the V8 branch, available with two engine generations. The 850Ci is a later, larger V12 branch. The 850CSi is the specialized S70-powered branch with BMW M engineering changes. Similar bodywork does not mean interchangeable specifications or parts.
Gearbox, equipment and market specification
Engine identity is only one part of an E31 specification. The equipment, gearbox, steering arrangement and emissions hardware can vary by model year and market. A European CSi, a North American 840Ci and an imported car may not present the same factory equipment even when their badges look familiar. Ask the seller to identify the transmission and provide photographs of the identification labels, engine bay and underbody components.
Do not assume that a replacement gearbox, differential, wheels or suspension makes a car worthless, but do document the change. The useful question is whether the current configuration suits your intended use and whether the original parts accompany the car. For a restoration, missing original components can matter as much as mechanical condition; for regular driving, a properly documented replacement may be acceptable. Make that distinction explicitly rather than treating “modified” as a complete diagnosis.
Why condition can outweigh the badge
Both models are older, complex grand tourers. The supplied specifications establish the engines and CSi equipment differences, but they do not establish a universal reliability ranking or a fixed running-cost gap. A neglected V8 can need more work than a carefully serviced V12, while a modified CSi can require more investigation than an original 840Ci. Service continuity, structural condition, electrical operation and the quality of prior repairs should therefore be treated as primary decision factors.
Read invoices as a timeline. Confirm that the work applies to the VIN and the engine currently installed, identify whether components were replaced or rebuilt, and look for gaps that the seller cannot explain. A single recent service does not prove long-term care. Conversely, a car with older work and clear evidence of regular use may be easier to evaluate than one with a freshly detailed engine bay and little paperwork.
Which one suits your intended use?
Choose the 840Ci when the V8 configuration is the priority
- You specifically want an E31 with a V8 rather than a V12.
- You are comfortable choosing between the 4.0-liter M60 and 4.4-liter M62 after verifying the exact car.
- You prefer to compare well-documented individual examples instead of shopping only by the rarest badge.
- You are willing to accept that equipment, gearbox and market specification vary by year and region.
The 840Ci is not automatically the inexpensive or simple E31 choice. It remains an old, technically complex coupe, and a neglected example can require more attention than a carefully maintained, better-documented car of another specification. The evidence here establishes the engine and model distinctions, not a universal reliability or running-cost ranking.
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Choose the 850CSi when the complete CSi specification is the point
- You specifically want the 5.6-liter S70 V12 and BMW M-developed identity.
- You value the documented CSi suspension, tire, steering and equipment changes.
- You can verify originality or understand exactly which components have been changed.
- You are prepared to maintain a rare, highly specialized older performance coupe.
The CSi’s rarity and specification can make its documentation especially important. A car described as a CSi should have evidence supporting the engine, chassis equipment and identifying details. Do not pay for the name while receiving an undocumented conversion or a car missing the equipment that defines the model.
When neither badge should decide the purchase
If two cars are being considered, a documented, structurally sound example with consistent maintenance history may be the better ownership decision even when it is not the version you first expected. The sources do not establish current prices, market-value premiums or a universal ranking of reliability. Those factors change with country, condition, originality and date, so a blanket statement that one model is always “better” would be misleading.
How to verify an actual 840Ci or 850CSi
Use this sequence before agreeing that an advertised car matches its description.
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- Confirm the factory identity. Record the VIN, build date, market and model designation. Ask for the original specification sheet or equivalent identifying documentation when available.
- Identify the engine. For an 840Ci, establish whether the car has the M60B40 or M62B44. For an 850CSi, confirm the 5.6-liter S70 specification. Compare the engine identification with the paperwork and service invoices.
- Separate 850CSi from 850Ci. A 5.4-liter M73 and the 326-hp/490-Nm specification identify the 850Ci described by BMW Group Classic, not the 5.6-liter CSi.
- Check the gearbox and market equipment. Record the transmission, steering arrangement, emissions equipment and installed options. Do not assume that a specification from one country applies unchanged to another.
- Audit the CSi hardware. On a claimed CSi, inspect the suspension, tire and wheel setup, steering components and other CSi equipment against the BMW CCA guide and factory documentation. Note replacements, upgrades and missing parts.
- Review the service trail. Match invoices to the VIN and engine. Look for continuity rather than a single recent service entry, and ask which components are original, rebuilt or replaced.
- Assess originality separately from condition. A modified car can be usable, while an original car can be poorly maintained. Record paint, interior, wheels, suspension, engine and drivetrain changes independently.
- Obtain an independent inspection. Have a technician familiar with older BMW coupes verify the identity, mechanical condition, leaks, electrical operation, suspension and structural condition before purchase.
- Price the work that is actually needed. Since no current transaction or asking-price range is established here, base your budget on inspection findings, parts availability and specialist labor in your market rather than on a generic online average.
Common comparison mistakes and how to avoid them
Comparing the wrong 840Ci engines
Quoting “286 hp” without mentioning the engine hides the 400-Nm versus 420-Nm difference. Always state whether the car has the M60B40 or M62B44 and carry the torque figure with it.
Calling every 850 a CSi
The 850Ci’s 5.4-liter M73 is a separate model. Check displacement and engine code before using CSi-specific claims.
Assuming all CSi equipment is visible
Badges and wheels can be changed. Verify suspension, steering and other equipment through inspection and records, not appearance alone.
Using a North American guide as a worldwide specification sheet
The BMW CCA guide is a club publication with North American scope. Use it as a reference, then confirm the market and production-year details of the car you are buying.
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Repair common Windows errors and clear accumulated junk for a smoother, more stable PC - no reinstall needed.Free scan · no reinstallTreating historical figures as a current road test
BMW’s published horsepower, torque, weight and acceleration figures describe period specifications. No independent back-to-back test is established here, so do not claim that one model is objectively faster or better to drive from these numbers alone.
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Shopping by a supposed market-value premium
No current price range or transaction dataset is established for this comparison. Condition, originality, records, geography and date can change values substantially. Obtain current valuations separately if a purchase decision depends on money.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.A practical decision framework
| If your priority is… | Start with… | Then verify… |
|---|---|---|
| The E31 V8 experience | 840Ci | M60B40 versus M62B44, torque figure, gearbox and market equipment |
| The BMW M-developed V12 specification | 850CSi | S70 identity, CSi suspension, tires, steering, equipment and originality |
| A later V12 without the CSi designation | 850Ci | M73 5.4-liter engine and the separate 326-hp/490-Nm specification |
| The safest purchase decision among available cars | The best-documented, best-inspected example | VIN consistency, service history, structural condition and realistic maintenance budget |
That framework keeps the decision tied to what you will own rather than to an abstract ranking. If the available 840Ci is a documented M62 car in excellent condition and the available CSi lacks proof of its engine or chassis specification, the 840Ci deserves serious consideration. Conversely, if the defining BMW M-developed specification is non-negotiable and a CSi has complete records and correct equipment, the CSi is the appropriate target.
Frequently asked questions
What is the main difference between the BMW 850CSi and 840Ci?
The 840Ci is the E31 V8 model, using either the 4.0-liter M60B40 or 4.4-liter M62B44. The 850CSi uses the 5.6-liter S70 V12 and adds BMW M-developed chassis and equipment changes. They are distinct specifications, not merely different trim levels.
Is the BMW 850CSi an M car?
BMW M’s historical account identifies the 850CSi as an M-developed performance version. Its S70 engine and documented suspension, tire, steering and equipment changes distinguish it from the regular 850Ci. Verify the actual car’s identity and components rather than relying on badges alone.
What engine does an E31 840Ci have?
Depending on production date, an 840Ci has the 4.0-liter M60B40 or the later 4.4-liter M62B44. BMW Group Classic lists both at 286 hp; torque is listed as 400 Nm for the M60 and 420 Nm for the M62.
How can I tell an 850CSi from an 850Ci?
Confirm the engine and factory documentation. The 850CSi uses the 5.6-liter S70 V12 and is listed at 280 kW (380 hp). The later 850Ci uses the 5.4-liter M73 V12, listed at 326 hp and 490 Nm. Also inspect the CSi-specific chassis and equipment.
Is the 840Ci cheaper to own than the 850CSi?
The documented specifications do not support a universal cost ranking. Both are complex older cars, and condition, maintenance history, market, parts needs and specialist labor can dominate the ownership budget. Compare inspected examples rather than assuming the V8 badge guarantees lower costs.
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Assess them separately. Originality helps establish whether a car still matches its claimed specification, while condition determines what it needs now. A modified but well-documented car may be usable; an original but neglected car may require substantial work.
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Bottom line
The BMW 840Ci is the right E31 for a buyer who wants the V8 model and is prepared to identify which of its two engines is installed. The BMW 850CSi is the right E31 for a buyer who wants the 5.6-liter S70 V12 and its BMW M-developed chassis and equipment changes. Do not substitute an 850Ci for a CSi, and do not let a badge replace inspection. Compare actual cars by engine, specification, condition, documentation and intended use.
Sources for the specifications
- BMW M: The BMW 850 CSi E31, 28 November 2023.
- BMW Group Classic: BMW 840Ci (E31).
- BMW Group Press: Timelessly alluring: 25 years of the BMW 8 Series.
- BMW Group Classic: BMW 850Ci (E31).
- BMW Car Club of America: E31 8 Series Year-to-Year Changes 1992–1997 recap.
Frequently Asked Questions
What is the main difference between the BMW 850CSi and 840Ci?
The 840Ci is the E31 V8 model, with either a 4.0-liter M60B40 or 4.4-liter M62B44. The 850CSi uses a 5.6-liter S70 V12 plus BMW M-developed chassis and equipment changes.
Is the BMW 850CSi an M car?
BMW M describes the 850CSi as an M-developed performance version. Confirm the individual car’s S70 engine and CSi hardware rather than relying on badges.
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1Fix the driver behind crashes, sound loss and screen glitches2Repair Windows errors before they cause bigger problems3Scan for outdated or missing drivers - takes under a minuteWhat engine does an E31 840Ci have?
Depending on build date, it has the 4.0-liter M60B40 or later 4.4-liter M62B44. Both are listed at 286 hp; torque is 400 Nm for the M60 and 420 Nm for the M62.
How do I distinguish an 850CSi from an 850Ci?
The CSi uses the 5.6-liter S70 V12 and is listed at 280 kW (380 hp). The 850Ci uses the 5.4-liter M73 V12, listed at 326 hp and 490 Nm.
Is the 840Ci automatically cheaper to own?
No universal cost ranking is established. Condition, records, parts needs, market and specialist labor can matter more than the V8 or V12 badge.
The Bottom Line
Choose the 840Ci for its verified E31 V8 configuration; choose the 850CSi for the specific 5.6-liter S70 V12 and BMW M-developed chassis. In either case, buy the documented, inspected car—not merely the most impressive badge.
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