BMW M850i explained: the V8 grand tourer of the 8 Series
The BMW M850i is the V8 M Performance version of the 8 Series. The twin-turbo V8, coupé, convertible and Gran Coupé, chassis technology, comfort, running costs and how it compares with the M8.
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The BMW M850i xDrive is the V8-powered M Performance version of the 8 Series. Introduced in 2018, it combines a 4.4-litre twin-turbo V8 with all-wheel drive, advanced chassis technology and the luxury of BMW's flagship coupé.
It was offered as a coupé, convertible and four-door Gran Coupé, and many owners see it as the ideal grand tourer: fast, comfortable and elegant. In this article we explain the engine, the body styles, the technology, how it compares with the M8 and what to know about running costs.
The return of the 8 Series
BMW revived the 8 Series name in 2018, decades after the original E31 8 Series of the 1990s. Our article on the BMW 8 Series E31 history tells that story.
The new 8 Series replaced the 6 Series as BMW's luxury coupé and convertible. The M850i xDrive was the top model below the full M8 and was launched first, showing the character of the new range.
The BMW M850i engine
The BMW M850i uses a 4.4-litre twin-turbo V8 from BMW's N63 engine family, extensively updated for this model. It produces around 530 hp in many markets, with very strong torque from low revs.
The engine is combined with an eight-speed Steptronic automatic gearbox and xDrive all-wheel drive. The result is effortless performance, with acceleration from 0 to 100 km/h in under four seconds according to BMW. Our article on the BMW S63 engine explains the M version of this V8 family.
Body styles
The M850i was offered in three body styles:
- Coupé (G15): the classic two-door grand tourer.
- Convertible (G14): with a fabric roof that opens in seconds.
- Gran Coupé (G16): a four-door coupé with more rear space, popular as a stylish alternative to a saloon.
All three share the same drivetrain and much of the technology.
The coupé is the most focused and elegant, with two rear seats best suited to short trips. The convertible adds open-air driving with surprisingly little compromise in refinement when the roof is closed. The Gran Coupé is longer, with four doors and real space for rear passengers, which makes it the most practical choice for families who still want a sporty, low car. Many buyers choose the Gran Coupé as a stylish alternative to a large saloon.
Chassis technology
The M850i uses several advanced chassis systems:
- xDrive with a rear-biased setup.
- Integral Active Steering, which steers the rear wheels for agility and stability. Our article on BMW Integral Active Steering explains the system.
- Adaptive M suspension with different driving modes.
- Active roll stabilisation on some cars, to reduce body roll.
- An M Sport differential on the rear axle.
These systems make the car feel smaller and more agile than its size suggests.
Comfort and interior
The M850i is a true luxury car. Its interior offers high-quality materials, comfortable seats, modern displays and many driver assistance systems. Our article on BMW Driving Assistant Professional explains these systems.
Optional features such as glass controls, high-end audio systems and extended leather make the cabin special. It is a car designed for long journeys at high speed.
BMW Laserlight headlights were available on many cars and give an exceptional range at night on open roads. Our article on BMW headlights explains how they work.
M850i vs M8
Compared with the full M8:
- Power: the M8 has more power from the S63 M engine.
- Chassis: the M8 is firmer and more focused on track performance.
- Drive: the M8 offers a rear-wheel drive mode for the circuit.
- Comfort: the M850i is softer and quieter.
- Running costs: the M850i is usually cheaper to insure and maintain.
For most road drivers, the M850i offers more than enough performance with greater comfort. Our article on the BMW M8 history explains the M8.
Running costs and ownership
The M850i is a large, powerful car, so running costs are significant:
- Fuel consumption is high in town and when driven hard.
- Tyres and brakes are large and expensive.
- Servicing should use the correct oil and specialist knowledge.
- Depreciation can be strong on luxury cars, which makes used examples attractive.
Our article on BMW oil consumption explains what is normal for twin-turbo V8 engines.
Buying tips
When buying a used M850i:
- Check the service history and oil changes.
- Look for oil and coolant leaks.
- Test all electronic systems, including steering, suspension and driver assistance.
- Inspect the convertible roof if applicable.
- Have a diagnostic scan done.
Our complete checklist for buying a used BMW covers other checks. A well-maintained M850i is one of the most elegant and capable grand tourers BMW has made.
BMW M850i key facts
| Item | Details |
|---|---|
| Launched | 2018 |
| Body styles | G15 coupé, G14 convertible, G16 Gran Coupé |
| Engine | 4.4-litre twin-turbo V8 |
| Power | Around 530 hp |
| Gearbox | 8-speed Steptronic automatic |
| Drive | xDrive all-wheel drive |
| Chassis | Integral Active Steering, adaptive suspension |
Frequently asked questions
Is the BMW M850i an M car?
It is an M Performance model, not a full M car like the M8.
How much power does the M850i have?
Around 530 hp in many markets.
What is the difference between the M850i and M8?
The M8 has more power, a firmer chassis and track focus; the M850i is more comfortable and cheaper to run.
Is there an M850i Gran Coupé?
Yes. The G16 Gran Coupé is a four-door version with the same drivetrain.
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