New diesel variant with V8 power: The S 420 CDI flagship diesel model makes its debut with 235 kW/320 hp and 730 Nm of torque

Mercedes-Benz is extending its S-Class range with another diesel variant, the S 420 CDI. The new eight-cylinder model is powered by a state-of-the-art V8 CDI engine developing 235 kW/320 hp and 730 newton metres of peak torque. This latest addition to the model line-up means that the luxury saloon range from Mercedes-Benz now encompasses two diesel engines, six petrol models and two body variants, along with the new 4MATIC all-wheel-drive system. The new S 420 CDI is available to order now, with deliveries to customers due to start in December 2006. The short-wheelbase model is priced at € 84,448 (net price € 72,800) and the long-wheelbase version at € 92,104 (net price € 79,400).

The new V8 model's strengths are effortlessly superior performance combined with moderate fuel consumption. The S 420 CDI powers from 0 - 100 km/h in 6.6 seconds and goes on to reach 250 km/h (electronically governed), all while returning fuel consumption figures below the magic ten litre threshold, burning just 9.4 to 9.6 litres of diesel per 100 kilometres on the NEDC cycle. With a fuel tank capacity of 90 litres, this equates to ranges approaching the 1000 kilometre mark.

Such impressive figures are down to the highly advanced eight-cylinder turbodiesel engine under the bonnet: from its 3996 cc displacement, the CDI unit with four-valve-per-cylinder technology delivers a maximum output of 235 kW/320 hp at 3600 rpm and a peak torque of 730 newton metres, which is on tap from 2000 rpm. Third-generation common-rail high-pressure injection technology with a maximum injection pressure of 1600 bar and an ignition pressure of 175 bar ensures efficient combustion. Optimised flow dynamics for the best possible gas cycle and twin turbochargers with variable-nozzle turbines promise high power and torque delivery. As many as five injections of diesel fuel per injection cycle, special orifice nozzles, piezoelectric injectors and highly effective exhaust gas recirculation all help to lower emissions significantly. The new V8 powerplant is equipped as standard with a maintenance-free diesel particulate filter to cut untreated emissions even further, and also complies with the EU4 emissions standard. The engine development team was able to reduce noise levels by optimising the chain drive and fitting a rigid crankcase with large engine bearings as well as extra acoustic covers. The square bore-to-stroke ratio combines with a counter-rotating balancer shaft for outstandingly smooth operation.

Power transmission in the S 420 CDI is handled by the standard-fitted 7G-TRONIC automatic transmission with a DIRECT SELECT lever on the steering column, plus steering-wheel gearshift buttons. Not only does this combination guarantee that the tremendous reserves of power and torque are harnessed to optimum effect, the seven-speed automatic transmission's wide ratio spread is also perfect for motoring at low rev speeds – ideal for quiet, fuel-efficient travel. The top-of-the-range S-Class diesel model comes as standard with AIRMATIC air suspension including the Adaptive Damping System (ADS) and an all-round self-levelling function, while the latest-generation Active Body Control (ABC) can be specified as an option.

Broader model range than any other competitor in the world

The arrival of the new S 420 CDI sees Mercedes-Benz further expand its S-Class range to eleven models, making it the broadest luxury-segment model selection in the world. The two diesel variants, the S 320 CDI and S 420 CDI, line up alongside a choice of six petrol-powered models, including the S 450 whose new eight-cylinder engine extracts 250 kW/340 hp and 460 newton metres of torque from its 4.6-litre displacement. The line-up is headed by two extra dynamic and exclusive AMG high-performance models. The redeveloped 4MATIC all-wheel drive can be ordered for three of the S-Class variants. All models are available with either the short or the long wheelbase; the long version is standard for the V12 models.

High global demand for the new Mercedes-Benz S-Class

As the top-selling luxury model worldwide, the S-Class comfortably outstrips the sales figures for its rivals in every region of the world. In the first ten months of 2006, over 70,000 new luxury saloons were delivered to customers, the highest figure ever in the history of the company. On diesel sales too, the S-Class is again the No. 1 in the luxury segment, and Mercedes-Benz is now adding an exceptionally powerful model to the diesel line-up in the form of the new S 420 CDI. It is the successor to the V8-powered S 400 CDI that proved so popular in the previous S-Class range.

PRE-SAFE® as standard, Brake Assist PLUS as an option

The unrivalled PRE-SAFE® occupant protection system also forms part of the standard specification for the new leading S-Class diesel model. PRE-SAFE® is able to recognise potential accident situations as soon as they start to develop: if the rate of braking deceleration exceeds a certain threshold or there is a risk of skidding, the system triggers anticipatory measures, pulling the front seat belts taut and, if necessary, raising the front passenger seat backrest into a more upright position. On models fitted with the optional multicontour seats, the air cushions are inflated too so that they help to brace the front passenger and the occupants in the rear. The sliding sunroof (optional) is closed as a further precaution.

Brake Assist PLUS (BAS PLUS) can be specified as an optional extra. It uses radar to track any vehicles ahead of the car and warns the driver if the S-Class gets too close to the vehicle ahead or is approaching it too quickly. If there is a risk of collision, the system instantaneously calculates the optimal braking power required and makes this available immediately as soon as the driver starts braking, even if the brake pedal is not pressed hard enough. The result is a significant reduction in the number of rear-end collisions. Combining the new Brake Assist PLUS with PRE-SAFE® allows occupant protection to be taken to even greater heights. The introduction of PRE-SAFE® has made Mercedes-Benz the first automotive brand in the world to fit as standard such an extensive safety system that swings into action ahead of a potential accident.

PRE-SAFE® Brake system with the very latest radar technology

For the first time ever in the S-Class, Mercedes-Benz is offering a complement to this multi-award-winning anticipatory protection system, in the form of the newly developed PRE SAFE® Brake system. This works in unison with Brake Assist PLUS (BAS PLUS), which issues drivers with a visual and an acoustic warning of an impending rear-end collision with a vehicle ahead and automatically calculates how much braking power is needed to prevent the collision. The braking power is boosted as required the instant the driver presses the brake pedal. However, should the driver fail to heed the warnings and the risk of an accident become acute, the PRE-SAFE® Brake system automatically initiates partial braking to decelerate the S-Class with around 40 per cent of maximum braking power. This partial self-braking – in effect a 'virtual' crumple zone – is a further tangible prompt for the driver to take action. If the brake pedal is pressed at this stage, maximum braking power will be applied. Depending on the particular situation, this could be enough to avert a collision at the last moment. If it is not, the severity of the impact will at least be mitigated and the risk of injury to the occupants therefore lessened thanks to the PRE-SAFE® Brake. Mercedes-Benz offers BAS PLUS and the PRE SAFE® Brake as an option in conjunction with DISTRONIC PLUS proximity control.

DISTRONIC PLUS: assistant for driving in stop-start traffic

The radar-assisted DISTRONIC PLUS system is operative in a speed range from zero up to 200 km/h and enables even more comfortable motoring. In stop-start traffic, DISTRONIC PLUS keeps the new S-Class at the programmed distance from the vehicle ahead, automatically brakes the saloon to a halt and accelerates back up to the stored speed upon the driver's command. In this way, the assistance system relieves the strain on the driver whilst giving a major boost to driver-fitness safety. The Brake Assist PLUS and DISTRONIC PLUS package also comprises a Parking Assist system, which uses the radar technology to give advance warning of an imminent collision at the front or rear of the vehicle when parking.

Extensive, stylish standard specification

The standard specification for the new S 420 CDI includes a host of high-tech systems which are designed to enhance levels of safety and comfort – such as the ADAPTIVE BRAKE system, seats with 12-way electrical adjustment, COMAND with DVD player, DIRECT SELECT gearshift and automatic climate control.

by Mercedes-Benz

The Mercedes Benz S Class: automobile comfort of the highest standard

• S Class: the epitome of automobile comfort

• Every generation of vehicles provides ground-breaking solutions to the expectations of customers with regard to comfort

The history of the Mercedes Benz S Class shows that automobile comfort is far more than just a luxurious ambiance, size and performance. In fact it is far more the intelligent support of the driver and passengers through innovative technical solutions providing answers to current questions and requirements which contribute to the holistic comfort of a vehicle. Added to that is the highest quality of material, design and production. The sum of these factors provides for a perfect mobile location.

The Mercedes Benz S Class and its predecessor model series have always stood for precisely this to a particularly high degree. Even the Mercedes Simplex 60 hp from 1903 documents this high standard of comfort. Emil Jellinek, successful businessman and father of the Mercedes brand's eponym had a long-distance saloon mounted on the chassis of the new top model of the Stuttgart brand for his own personal use. The comfort of the vehicle is not only reflected in the engine output of 60 hp (44 kW) which at the time was a superior achievement, but also in the spacious passenger compartment in which the occupants sat on comfortable seats upholstered with the very finest brocade.

The S Class' complete ancestral line begins after the Second World War. Initially it was the two Mercedes Benz models 220 (W 187) and 300 (W 186), both presented in 1951, that again set standards with regard to comfort in the luxury segment. At the same time the S Class continued the tradition of luxurious vehicles from the Mercedes Benz brand and its predecessor brands. This continuity illustrates how well the engineers of each period have recognised and fulfilled the comfort requirements of customers.

But what is it exactly that makes an automobile particularly comfortable? As important the feeling of comfort is to the driver and passengers, it is still difficult to measure and express in an absolute, measurable value.

An examination of the definition of comfort

The human perception of comfort is made up of various factors such as a feeling of safety, good driving characteristics, sufficient performance, a high degree of ergonomics, and an impression of excellent quality. Furthermore, reduced fatigue, the interior climate, and clarity with regard to the operation of increasingly complex vehicle systems influence the perception of comfort. Ride comfort, that is the harmony between the moving automobile and the road, is a particularly strong constant in Mercedes Benz vehicles.

The 220 (W 187) and 300 (W 186) models, presented in 1951, were praised in contemporary driving tests for their extremely comfortable driving characteristics. In the generations of the S Class that followed, the engineers continued to increase this high level of comfort with the introduction of new innovations: for example the single-joint swing axle in the 220 'Ponton' model (W 180) with self-supporting chassis-body structure, presented in 1954, offered a previously unknown degree of driving comfort and at the same time increased driving safety. Furthermore, the so-called subframe which carries the engine and front wheels was decoupled from the body by generously designed rubber bushes which further reduced vibration in the vehicle interior.

In the years that followed, innovations such as air suspension (incorporated in the 'fintail' model series W 112 as from 1963), a hydropneumatic suspension with a self-levelling system (in the 450 SEL 6.9 of the W 116 as from 1975), the Adaptive Damping System ADS (W/V 140) and Active Body Control (standard in the S 600 of the W/V 220 model series) contributed to a higher standard of driving comfort. Many of the solutions first premiered as standard or special equipment in the S Class before finding their way into the other vehicle segments.

The automobile: the driver's partner

Driving comfort also means that the automobile plays a partner-like assisting role for the driver. The relevant functions range from automatic transmission to modern support systems as inherent elements of the integrated safety provided by Mercedes Benz.

From this perspective, the evolution phases of the S Class include for example the hydraulic automatic 'Hydrak' clutch (W 180, as from 1957), the electronically controlled five-speed automatic transmission (W/V 140, as from 1995) and the 7G-TRONIC seven-speed automatic transmission with an electronic control system and the DIRECT SELECT steering wheel gearshift (W/V 221, as from 2005).

Cruise control has been available as an option since its introduction in 1975 in the S Class of the W 116 model series. In 1995, PARKTRONIC, the electronic parking aid, and the Auto Pilot System (APS) for navigation premiered in the W/V 140 model series followed by LINGUATRONIC, the voice-operated control system in 1996. COMAND, the control and display system with a dynamic navigation system and KEYLESS-GO an access and drive authorisation system without keys were launched in the W/V 220 model series in 1998.

New interfaces

The S Class of the W/V 221 model series with systems such as the further-developed adaptive cruise control DISTRONIC PLUS which brakes the vehicle to a standstill in critical situations illustrates how innovative technology is increasing the importance of the car in its role as a partner for the driver. The SPLITVIEW display (as from 2009) offers a new optical interface for the interactive services provided by COMAND Online, which simultaneously displays different contents on the screen for the driver and passengers. As a result, the driver can use the navigation system whilst the front passenger uses the Internet.

Daimler AG regularly shows the future of comfortable vehicle operation in visionary research vehicles whose functions are often launched in standard production together with the S Class. In 2011, for example, the F 125! fascinated with the '@yourCOMAND' telematics system which is controlled by gestures and voice.

Climate and ergonomics

Personal wellbeing is an emotion which particularly contributes to the perception of comfort. That is why engineers have always worked at improving the standard of climate and ergonomics in every generation of the S Class. As a result the Mercedes Benz models in the luxury segment offered a heating system with a blower as early as 1951 – which at the time was far from being the rule. This comfort equipment was even standard in the 300 model – the 'Adenauer-Mercedes' (W 186) – and was available as an option for the smaller 220 (W 187) model. In the 220 (W 180) 'Ponton' model with self-supporting chassis-body structure presented in 1954 it was possible to individually regulate the driver's and front passenger's heating. As of 1958 customers who purchased the 300 (W 189) model could order an air conditioning system – then known as a 'cooling system' if required. By the time, the new generation of S Class was launched in 1991 (W/V 140), technology had further developed and included automatic climate control with an activated charcoal filter and CO/NOX-sensitive sensors. Finally in 1998, the W/V 220 model series offered multi-zone automatic climate control with individual control at each seat depending on the sun's position as well as luxury seats with ventilation and dynamic multicontour backrest – as an optional extra.

A high degree of ergonomics is a further key to comfort. Here, the Mercedes Benz models in the high-end and luxury segment began to set priorities with intelligent interior design at a very early stage – for example with the self-supporting chassis-body structure of the Mercedes Benz 220 'Ponton' (W 180) from 1954 and a version with a longer wheelbase, first implemented in 1963 in the 'fintail' Mercedes 300 SE from the W 112 model series. Innovations ranging from the electrically adjustable steering column in the W/V 126 model series (as from 1985) to the dynamic multicontour front seats with extended massage function in the W/V 221 (as from 2005) mark the path of development as the car is adapted to perfectly match the driver's requirements.

Travelling with the greatest degree of comfort – that is the leitmotif throughout the history of the S Class since the very beginnings of this extraordinary family of models from Mercedes Benz. And the technically excellent future of the S Class continues to build on this legacy with new innovations.

Comfort highlights in the S Class and its predecessor model series

The Mercedes Benz S Class and its predecessor model series have always been pioneers of innovative automobile technology. Repeatedly they have brought improvements onto the market which have then found acceptance throughout. The following is a short overview of the comfort-relevant features in the individual model series.

Mercedes Simplex 60 hp (1903 to 1905)

• Cutting-edge high-performance engine: large-displacement four-cylinder engine with overhead inlet valves for superior performance

• A spacious body with comfortable padded seats and top-quality fabric covers

Mercedes-Benz Nürburg, W 08 (1928 to 1933)

• First Mercedes-Benz series passenger car with an eight-cylinder engine

• Luxurious and spacious Pullman body

• High-speed transmission system as special equipment (as from 1931, in conjunction with increased cubic capacity)

Mercedes-Benz 770 'Super Mercedes', W 07, W 150 (1930 to 1943)

• First series production car with an eight-cylinder supercharged engine

• High-speed transmission system (five-speed manual transmission as from 1938)

• De Dion rear axle (as from 1938)

Mercedes-Benz 320, W 142 (1937 to 1942)

• All-synchromesh four-speed transmission (with remote action gear as from 1939)

• Pullman Saloon (series production with exterior case for luggage as from 1939)

Mercedes-Benz 300, W 186 and W 189 (1951 to 1962)

• Cutting-edge six-cylinder engine with overhead camshaft

• Electrically-operated torsion bar suspension to compensate the height under heavy loads

• Heating system with blower as standard

• Air conditioning system as special equipment (as from 1958)

• Power-assisted steering as special equipment (as from 1958)

Mercedes-Benz 220, W 187 (1951 to 1954)

• Cutting-edge six-cylinder engine with overhead camshaft

• Heating system with blower as an option

Mercedes-Benz 220 /220 S/220 SE, W 180/W 128 (1954 to 1959)

• Increased spatial comfort due to modern Ponton shape

• Front suspension subframe

• Single-joint swing axle with low centre of rotation

• Heating system with blower as standard, individually regulated for driver and front passenger

• Hydraulic automatic 'Hydrak' clutch as special equipment (as from 1957)

Mercedes-Benz 220 to 300 SE long, W 111/W 112 (1959 to 1965)

• Four-speed automatic transmission (as from 1961)

• Air suspension (300 SE, as from 1961)

• Long version available (300 SE, as from 1963)

• Central locking as special equipment (300 SE long)

Mercedes-Benz 600, W 100 (1963 to 1981)

• Powerful, large-displacement V8 engine

• Four-speed automatic transmission

• Air suspension

• Power-assisted steering

• Convenience hydraulic system for seat adjustment, opening and closing doors, windows and the boot

• Electronically controlled heating and ventilation system

Mercedes-Benz 250 S to 300 SEL 6.3, W 108/W 109 (1965 to 1972)

• Hydropneumatic compensating spring on rear axle

• Air suspension (300 SEL, 300 SEL 6.3, 300 SEL 3.5)

• Top-of-the-range 300 SEL 6.3 with powerful V8 engine with an output of 250 hp (184 kW), and sports car performance (as from 1968)

Mercedes-Benz S Class W 116 model series (1972 from 1980)

• Dirt-deflecting tail lights, dirt-deflecting side windows

• Cruise control as special equipment (as from 1975)

• Double wishbone front axle with zero scrub radius

• Coupled-link axle with anti-squat control (450 SE, 450 SEL, 450 SEL 6.9)

• Automatic transmission with torque converter as special equipment (standard on 450 SE, 450 SEL, 450 SEL 6.9)

• Self-levelling hydropneumatic suspension (450 SEL 6.9, as from 1975)

Mercedes-Benz S Class W/V 126 model (1979 to 1991)

• Electrically adjustable steering column as special equipment (as from 1985)

• Automatic limited-slip differential as special equipment for the six-cylinder models (as from 1985)

• Acceleration skid control system ASR as special equipment for V8 models (as from 1985)

Mercedes-Benz S-Class W/V 140 model series (1991 to 1998)

• First Mercedes Benz standard production passenger car with a twelve-cylinder engine; then the brand's most powerful passenger car engine ever (600 SE, 600 SEL)

• Electronically controlled five-speed automatic transmission (standard for V8 and V12 models, as from 1995)

• Speed-sensitive power steering

• Double-glazed side windows for maximum noise comfort

• Automatic climate control with activated charcoal filter and CO/NOX-sensitive sensors as standard (S 600) or as optional equipment

• Electrically folding exterior mirrors

• Power closing for doors and boot lid as special equipment

• Seat belts with automatic height adjustment

• Adaptive Damping System ADS as special equipment

• PARKTRONIC electronic parking aid as standard equipment (S 600, as from 1995) or as special equipment (as from 1995)

• Auto Pilot System APS navigation system as special equipment (as from 1995)

• TELE-AID emergency call system (as from 1997) as special equipment

• LINGUATRONIC voice-operated control system as special equipment (as from 1996)

• Xenon headlamps with dynamic headlamp range adjustment as special equipment (as from 1996)

Mercedes-Benz S Class W/V 220 model series (1998 to 2005)

• 7G-TRONIC seven-speed automatic transmission with electronic control (S 430, S 500, as from 2004)

• AIRMATIC air suspension with electronically controlled Adaptive Damping System

• Active Body Control suspension as special equipment (standard in the S 600)

• Automatic headlamp mode

• COMAND control and display system with dynamic navigation system as special equipment

• Multi-zone automatic climate control with individual control at each seat depending on the sun's position

• Luxury seats with ventilation and dynamic multicontour backrest as special equipment

• DISTRONIC adaptive cruise control as special equipment

• KEYLESS GO access and drive authorisation system as special equipment

• Bi-xenon headlamps with dynamic headlamp range adjustment as special equipment (as from 2002, standard in the S 600)

• 4MATIC all-wheel drive as special equipment (S 430, S 500, as from 2002)

Mercedes-Benz S Class W/V 221 model series (2005 to 2013)

• 7G-TRONIC seven-speed automatic transmission with electronic control and DIRECT SELECT steering wheel gearshift

• Active Body Control ABC suspension with crosswind stabilisation as special equipment (standard in the S 600)

• ADAPTIVE BRAKE brake system

• Further development of DISTRONIC PLUS adaptive cruise control (with braking to a standstill) as special equipment

• Further developed COMAND system with controller on the transmission tunnel

• SPLITVIEW display as special equipment (as from 2009)

• Parking Assist as special equipment

• Active Night View Assist as special equipment

• Adaptive Full Beam Assist as special equipment (as from 2009)

• Speed Limit Assist as special equipment (as from 2009)

• Dynamic multicontour seats with new massage function

• Parking brake with electronic assistance

by Mercedes-Benz