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ASSYST - Active Service System

Engines are equipped with a microcomputer that monitors the aging of the motor oil via data transmitted by sensors and calculates an individualized maintenance plan for the engine. A digital indicator in the cockpit notifies the driver of the number of kilometers remaining before the next maintenance check.

All engines fitted in newer Mercedes' are equipped as standard with the Active Service System ASSYST, which registers the varying operating loads individually and takes these into account for scheduling engine maintenance.

On the basis of sensor-derived data such as oil level, oil temperature, coolant temperature, engine speed, road speed and engine load, a microcomputer calculates the actual load on the engine oil and works out a servicing schedule for the engine which reflects this and announces the driver.