The term “X engine” refers to a mechanical architecture where multiple power sources (thermal, electric, generator) are connected by a set of shafts and clutches arranged to form an X pattern. This arrangement allows the system to switch between different operating modes without the driver manually intervening in the transmission chain.
Multi-mode architecture: how the X engine changes the traction chain
In a conventional powertrain, the thermal engine is permanently connected to the wheels, possibly assisted by an electric motor. The X engine breaks this logic by mechanically decoupling the thermal engine, the electric generator, and the wheels via a series of demand-activated clutches.
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The thermal engine can drive the wheels, function solely as a generator, or remain idle while the electric motor solely provides traction. This decoupling opens up three distinct driving scenarios within a single vehicle, whereas a conventional hybrid typically offers only two.
To explore the concrete applications of this technology in the automotive field, several technical sheets are available on the X engine at Motor X Club, with details on configurations by model.
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The main interest lies in optimizing fuel consumption. When the vehicle is driving at low speeds in the city, the thermal engine shuts off and the electric motor takes over. On the highway, the thermal engine drives the wheels directly without going through electric conversion, which reduces energy losses related to the dual transformation (mechanical to electric, then electric to mechanical).
Hybrid powertrain and X engine: why the growth of the segment changes the game
Recent data from the automotive market shows that hybrids are the most dynamic component of powertrain sales. Registrations of hybrid vehicles are increasing faster than those of purely electric or thermal vehicles. The X engine fits into this trend by pushing the hybrid logic a step further.
Where a classic parallel hybrid simply adds an electric motor to the thermal one, the X architecture offers fine management of each energy source. The manufacturer behind the Super One model, with initial deliveries announced for 2026 and ramping up towards 2027, is banking on this approach to differentiate itself in an increasingly competitive segment.
What distinguishes the X engine from a series or parallel hybrid
A series hybrid uses the thermal engine exclusively as a generator: energy always passes through the electric motor before reaching the wheels. A parallel hybrid allows the thermal and electric engines to work together or separately, but the mechanical connection remains fixed.
The X engine combines these two logics and adds a third mode: direct traction by the thermal engine without any intermediate electric conversion. This flexibility requires a more complex clutch system but eliminates the energy losses inherent to each architecture taken in isolation.
- Pure electric mode: the thermal engine is mechanically decoupled, the battery powers the electric motor which drives the wheels. Suitable for low-speed urban driving.
- Series mode (generator): the thermal engine runs at its optimal speed to recharge the battery, without direct connection to the wheels. Useful in case of low battery in traffic jams.
- Direct traction mode: the thermal engine drives the wheels via the transmission, without going through the electric circuit. Efficiency is maximized on roads or highways at stabilized speeds.
Fuel consumption and maintenance: the concrete implications for the motorist
The promise of reduced consumption is based on a simple principle: each operating mode is activated in the range where it consumes the least. The thermal engine never runs at an inefficient speed since it can be decoupled at any moment.
However, the mechanical complexity of the system raises questions about long-term reliability. The multi-disc clutches that enable transitions between modes are wear parts. The first vehicles equipped have not yet accumulated enough kilometers to provide consolidated data on the lifespan of these components.
Impact on the maintenance budget of an X engine vehicle
The maintenance cost of a vehicle with an X engine depends on several factors that traditional pricing grids do not yet cover.
- Brake pads wear out less quickly thanks to regenerative braking, as with any hybrid.
- The thermal engine, used intermittently, should see its oil change intervals extend compared to a conventional thermal engine.
- The clutch system specific to the X engine represents a new maintenance item, with replacement costs still poorly documented at this stage.
- The electronics managing the modes add a layer of diagnostics that not all workshops have mastered yet.
Car insurance for this type of vehicle could also evolve. Insurers generally classify hybrids into specific pricing categories, but the newer X architecture does not yet have sufficient claims history to stabilize rates.
European regulatory framework and the future of the X engine
The European Union has recently revised its position on the total ban of thermal engines initially planned. This retreat opens a window for advanced hybrid architectures like the X engine, which retains a thermal block while significantly reducing emissions.
The new generation BMW X5 illustrates this trend with a range of powertrains covering gasoline, diesel, hybrid, electric, and even hydrogen. The diversification of powertrains within a single model shows that manufacturers are no longer betting on a single technology but on the coexistence of multiple architectures according to usage.
The available data does not allow us to conclude whether the X engine will become a standard or remain confined to certain segments. Its mechanical complexity currently targets mid to high-end vehicles, where the manufacturing cost can be absorbed by the selling price. The planned production volumes starting in 2027 will provide an initial measure of the actual demand for this architecture.