The 4MATIC badge has accompanied many Mercedes-Benz models for decades, from saloons to SUVs and all the way to the AMG sports cars. It is not just a logo on the tailgate: it identifies the Star's entire all-wheel-drive system, a set of mechanical and electronic components designed to transfer engine torque to all four wheels as effectively as possible. Let's look at how it works, which variants exist and why, on a reconditioned car, its health deserves a dedicated check.
What is Mercedes-Benz 4MATIC
4MATIC is the solution with which Mercedes-Benz splits power between the front and rear axles. On most longitudinally engined models — such as the C-Class, E-Class and various SUVs — it is a permanent all-wheel-drive system: all four wheels receive torque continuously, not only when one loses grip. The result is predictable behaviour and constant traction, both under acceleration and on demanding surfaces such as rain, snow or broken roads.
The mechanical heart is the torque splitter (transfer case), connected to the gearbox, which distributes power to the two axles through driveshafts and differentials. The system, however, is not governed by mechanics alone: a sophisticated electronic control comes into play.
Permanent or on-demand: not all 4MATIC systems are the same
On compact, transversely engined models (for example the A-Class, CLA, GLA and GLB) 4MATIC generally adopts a slightly different logic: drive is predominantly to the front, and an electronically controlled multi-plate clutch sends torque to the rear when needed, quickly and variably. The principle stays the same — maximise traction — but the split adapts more closely to driving conditions.
Compared with systems that engage all-wheel drive only after detecting a loss of grip, the permanent versions keep both axles always involved: the advantage is responsiveness, because there is no engagement delay. The result is greater stability in corners, better traction off the line and safer driving in the wet.
4ETS: the traction control that "brakes to drive"
One of the most interesting elements of the system is 4ETS (Electronic Traction System). Rather than resorting to costly mechanical limited-slip differentials, Mercedes-Benz makes use of the wheel-speed sensors already present for ABS and ESP. When 4ETS detects that one wheel is turning faster than the others — that is, spinning — it applies targeted braking to that very wheel.
By braking the spinning wheel, the system forces the differential to redistribute torque towards the wheels that still have grip. In practice, 4ETS electronically simulates the effect of a locking differential, without the weight and complexity of purely mechanical solutions. Everything happens in a fraction of a second and almost imperceptibly for the driver.
How torque is distributed
In 4MATIC the torque is almost never split evenly between the two axles. The baseline calibration tends to favour balanced behaviour, but with a slight bias towards the rear, so as to preserve the driving dynamics typical of rear-wheel-drive Mercedes models. The exact figures vary depending on the platform and the model and, on many recent versions, the distribution can adapt continuously to driving conditions.
Comfort and performance variants
There is not just one 4MATIC. The comfort-oriented versions, typical of saloons and SUVs, rely on a calibration that prioritises traction, safety and smoothness, ideal for everyday use and long journeys. The performance versions instead adopt more sophisticated solutions, often with an electronically controlled multi-plate clutch capable of continuously varying the share of torque sent to each axle according to steering, throttle and grip.
AMG and 4MATIC+: a more rear-biased character
On the AMG division's sports cars the system, often designated 4MATIC+, is calibrated for a more rearward-biased split, for a more dynamic and engaging character. In some configurations the distribution is fully variable and, in specific driving modes, it can send almost all of the torque to the rear axle, bringing the behaviour close to that of a pure rear-wheel drive.
The concrete benefits on the road
- Traction and safety on low-grip surfaces such as rain, snow or gravel.
- Stability under acceleration, with less wheelspin off the line and on corner exit.
- Driving comfort, thanks to discreet and progressive electronic interventions.
- Versatility, with different calibrations depending on the model's character.
4MATIC and reconditioning: why diagnostics make the difference
An all-wheel-drive system has more wear-prone components than a two-wheel-drive one: torque splitter, driveshafts, differentials, joints and boots, plus sensors and control electronics. That is why, in our reconditioning process, every Mercedes-Benz 4MATIC undergoes dedicated checks.
With electronic diagnostics we verify the correct communication between ABS, ESP and 4ETS and the absence of fault codes stored in the control units; on the axle we check the levels and condition of the transmission lubricants, the integrity of the driveshaft boots and the play in the joints. Every check is recorded in the technical dossier signed by our Chief Mechanic, so that the buyer knows precisely the condition of the car's all-wheel-drive system.