BMW S68 engine explained: the new V8 for hybrid M cars
The BMW S68 is the new twin-turbo V8 for BMW's most powerful cars. How it works, the models that use it, its mild and plug-in hybrid versions and what it means for owners.
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The BMW S68 is the newest twin-turbo V8 from BMW M. Introduced in 2022, it powers the BMW XM, the latest M5 and several top models such as the X5 M60i, X7 M60i and 760i.
It was designed from the start to work with hybrid technology, from 48-volt mild hybrid systems to high-voltage plug-in hybrids. In this article we explain how the BMW S68 works, the models that use it, how it differs from the S63 and what it means for owners.
Why BMW developed a new V8
The S63 twin-turbo V8 served BMW's top M models for more than a decade. Our article on the BMW S63 engine explains its history. Stricter emissions rules and the move towards electrification required a new engine that could work efficiently with hybrid systems.
The S68 was developed by BMW M with this in mind. It carries the S code of M engines, but it is used both in full M models and in top versions of regular BMW models, where it replaces earlier V8 engines.
How the BMW S68 is built
The BMW S68 is a 4.4-litre twin-turbo V8 with the turbochargers placed between the cylinder banks for a short exhaust path and quick response. BMW M updated many areas compared with earlier V8 engines, including:
- Turbocharging and exhaust layout for better response and efficiency.
- Cooling for sustained high loads and hybrid operation.
- Oil supply suitable for dynamic driving.
- Integration with hybrid components, such as starter-generators and electric motors.
The engine is designed to meet modern emissions standards while delivering high power and torque.
An important part of the design is the particulate filter and exhaust treatment required by modern regulations. These systems are integrated so that they do not limit performance, while keeping emissions low. Owners do not need to do anything special, but regular servicing and the correct oil help the whole system work as intended.
Mild hybrid versions
In models such as the X5 M60i, X7 M60i and 760i, the S68 works with a 48-volt mild hybrid system. A starter-generator supports the engine when accelerating and enables smoother restarts and coasting phases.
In these cars, the S68 produces around 530 hp in many markets. The result is strong performance with better efficiency than earlier V8 models. Our article on BMW Auto Start-Stop explains how mild hybrid systems support the engine.
Plug-in hybrid versions
In the BMW XM and the latest M5, the S68 is combined with an electric motor integrated into the eight-speed gearbox and a high-voltage battery. This system, called M Hybrid, delivers combined outputs far above the V8 alone.
The electric motor fills in torque at low engine speeds and allows electric driving for short and medium trips. Our articles on the BMW XM and the BMW M5 G90 explain these cars in detail.
S68 vs S63
Compared with the S63:
- Designed for hybrids: the S68 was developed to work with electric systems from the start.
- Improved efficiency and emissions, in line with newer regulations.
- Updated turbocharging and cooling.
- Broader use: the S68 powers both M models and top regular models.
The S63 remains a strong engine in earlier cars, but the S68 is the base for BMW's V8 future.
Maintenance and ownership
The S68 is still relatively new, so long-term experience is limited. As with every high-performance turbo engine:
- Use the correct approved oil and follow the service schedule. Our article on BMW M engine oil explains approvals.
- Warm up the engine gently before full load.
- Keep the hybrid system healthy, including the battery and software updates. Our article on BMW Remote Software Upgrade explains updates.
- Watch for leaks and warning messages.
Many S68-powered cars are still under warranty, which provides protection in the early years of ownership.
Models with the S68
At the time of writing, the S68 is used in models such as:
- BMW XM.
- BMW M5 (G90) and M5 Touring (G99).
- X5 M60i and X7 M60i.
- 760i xDrive.
The range may grow over time. Check the official data for each model, as power outputs depend on the version and market.
What it means for enthusiasts
For enthusiasts, the S68 shows that BMW M is not giving up on the V8. Instead, the engine is evolving to work with electrification, combining the sound and character of a V8 with the instant torque of electric motors.
Whether this combination will win over traditional M fans is still being discussed. But the S68 ensures that BMW's most powerful cars keep a V8 at their heart for years to come.
BMW S68 engine at a glance
| Item | Details |
|---|---|
| Introduced | 2022 |
| Layout | 4.4-litre twin-turbo V8 |
| Mild hybrid | 48-volt system in X5 M60i, X7 M60i, 760i |
| Plug-in hybrid | M Hybrid in the XM and M5 |
| Mild hybrid power | Around 530 hp in many markets |
| Predecessor | S63 |
| Focus | Efficiency, emissions and hybrid integration |
Frequently asked questions
Which cars have the BMW S68 engine?
Models such as the BMW XM, M5 G90, M5 Touring G99, X5 M60i, X7 M60i and 760i.
Is the S68 a hybrid engine?
It is a V8 designed to work with hybrid systems, from 48-volt mild hybrids to plug-in hybrid M Hybrid systems.
What replaced the S63?
The S68 is the successor to the S63 in BMW's top V8 models.
How much power does the S68 have?
Around 530 hp in mild hybrid models, and much more combined output in plug-in hybrid M cars.
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