The highest level of protection combined with the best possible comfort for passengers and staff, that is the GUARD philosophy. This can be illustrated with two examples. The S 680 GUARD 4MATIC, for example, features newly developed door actuators. Although the doors are very heavy due to their armouring, this electro-mechanical system means that only low operating forces are required for opening and closing. This applies not only on level ground, but also when the vehicle is on a slope. The stepless door arrest also proves its worth in this situation. The door's sensor technology detects when and how it is to be moved or stopped. Algorithms from human-supporting robotics (cobots) are used. The system facilitates the work of the bodyguards in particular, and at the same time they can keep one hand free.

There is also a lot of intelligence in the hydraulically (instead of electrically) operated window lifters. Even if the on-board power supply fails, emergency operation is possible, i.e. closing in the event of an attempted attack. In each door there is a corresponding unit consisting of a compressor and valve block together with a pressure accumulator.

Other special equipment designed specifically for the S 680 GUARD 4MATIC includes a fire extinguishing system with automatic triggering function and an emergency fresh air system that protects occupants from penetrating smoke or irritant gases and supplies them with fresh air. Other special GUARD options include an extensive range of equipment for authorities, such as a siren, flashing lights and radios, as well as a panic alarm system.

The V12 biturbo power unit has been extensively revised for its use in the new S-Class generation. The exhaust gas turbochargers, exhaust manifold and air ducting were all adapted. Also new is a closed-loop petrol particulate filter. The V12 has an output of 450 kW/612 hp and a displacement of 5980 cc. The maximum torque is 830 Nm from 2000 rpm. The most important features of the engine include an all-aluminium crankcase, a one-piece chain drive, a forged crankshaft made of high-quality quenched and tempered steel, forged pistons and a multi-spark ignition system with twelve twin-power ignition coils.

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