BMW M550i explained: the V8 M Performance saloon
The BMW M550i combines a twin-turbo V8 with xDrive and the comfort of the 5 Series. The engine, performance, comfort, how it compares with the M5, running costs and buying tips.
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The BMW M550i xDrive is the M Performance version of the G30 5 Series. Introduced in 2017, it combines a 4.4-litre twin-turbo V8 with all-wheel drive, adaptive suspension and the comfort of an executive saloon.
Many owners see it as the sweet spot between a regular 5 Series and the full M5: very fast, comfortable and more discreet. In this article we explain the engine, performance, comfort, how it compares with the M5, running costs and what to check when buying one.
A V8 M Performance saloon
The M550i was one of the first M Performance models with a V8 engine. It sits above the 540i and below the M5 in the 5 Series range. Our article on BMW M vs M Performance vs M Sport explains this category.
The car offers performance close to older M5 generations, combined with a relaxed character, a high level of comfort and modern technology.
The BMW M550i engine
The BMW M550i uses a 4.4-litre twin-turbo V8 from the N63 family, the same basic engine family that the S63 M engine is based on. Our article on the BMW S63 engine explains the relationship between these engines.
At launch, the engine produced around 462 hp. After the 2020 update, power increased to around 530 hp in many markets. The V8 delivers enormous torque from low revs and a deep, refined sound. It is combined with an eight-speed Steptronic automatic gearbox.
Performance and xDrive
With xDrive all-wheel drive and strong torque, the M550i accelerates from 0 to 100 km/h in around four seconds, depending on the version. Its rear-biased xDrive system provides excellent traction in all weather.
In real-world driving, the M550i is extremely fast and effortless, especially on motorways and when overtaking. It is less focused than the M5 on track, but very quick on the road.
The brakes are strong for road use, though repeated hard stops on a circuit will test them more than the M5's brakes. Owners who plan occasional track days should consider track pads and fresh brake fluid. Our article on track brake pads and fluid explains the options.
Comfort and refinement
The M550i is tuned for comfort as well as speed. Adaptive suspension, an M Sport differential on many cars and a well-insulated cabin make it a superb long-distance car. Many cars also have Integral Active Steering, which makes the large saloon feel more agile. Our article on BMW Integral Active Steering explains this system.
Inside, it offers the full range of 5 Series luxury and technology, including a large digital display and driver assistance systems.
M550i vs M5
Compared with the F90 M5:
- Power: the M5 has more power and a more aggressive engine character.
- Chassis: the M5 has stiffer suspension, a wider track and stronger brakes, designed for track use.
- Drive: both have all-wheel drive, but the M5 offers a rear-wheel drive mode.
- Comfort: the M550i is softer and quieter.
- Running costs: the M550i is usually cheaper to insure, maintain and fuel.
- Discretion: the M550i looks more like a regular 5 Series.
For many buyers who rarely drive on track, the M550i offers most of the performance with more comfort and lower costs.
Running costs and reliability
The M550i is still a powerful V8 car, and running costs are higher than for six-cylinder models. Budget for:
- Fuel, especially in town.
- Oil changes with the correct approved oil, often more frequently than the maximum interval.
- Tyres and brakes on a heavy, powerful car.
- Cooling system and leaks, which deserve attention on twin-turbo V8 engines.
Our article on BMW oil consumption explains what is normal for these engines.
Buying tips
When buying a used M550i:
- Check the service history and oil change intervals.
- Ask about oil consumption and look for signs of leaks.
- Have a diagnostic scan done to check for stored faults.
- Test all electronic functions, including adaptive suspension and steering systems.
- Check tyres and brakes.
Our complete checklist for buying a used BMW covers the other checks.
The legacy
In the latest 5 Series generation, BMW shifted its focus towards electrified models, such as the fully electric i5 M60. This makes the V8-powered M550i a special car on the used market: one of the last fast executive saloons with a large V8 that does not carry the full M badge.
For drivers who want effortless speed, comfort and discretion, it remains one of the most appealing BMWs of its era.
As values of well-kept V8 saloons become more interesting to enthusiasts, a documented M550i with careful previous ownership is likely to remain in demand. Keep all invoices and service records, because they make a big difference when you sell the car.
BMW M550i key facts
| Item | Details |
|---|---|
| Internal code | G30 5 Series |
| Launched | 2017, updated in 2020 |
| Engine | 4.4-litre twin-turbo V8 |
| Power | Around 462 hp, later around 530 hp |
| Gearbox | 8-speed Steptronic automatic |
| Drive | xDrive all-wheel drive |
| Position | Between the 540i and the M5 |
Frequently asked questions
Is the BMW M550i an M car?
It is an M Performance model, not a full M car like the M5.
How much power does the M550i have?
Around 462 hp at launch and around 530 hp after the 2020 update in many markets.
Is the M550i reliable?
It can be reliable with careful maintenance. Oil changes, cooling system condition and leaks are important points.
Should I buy an M550i or an M5?
Choose the M550i for comfort and lower costs, and the M5 if you want maximum performance and track ability.
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