Mercedes-Benz W140


The Mercedes-Benz W140 is a series of flagship vehicles manufactured by Mercedes-Benz from 1991 to 1998 in sedan/saloon and coupe body styles and two wheelbase lengths. Mercedes-Benz unveiled the W140 S-Class at Geneva International Motor Show in March 1991, with the sales starting in April 1991 and North American launch was on 6 August 1991.
All models were renamed in June 1993 as part of the corporate-wide nomenclature changes for 1994 model year on, becoming "S" regardless of wheelbase length or body style as well as fuel type. Diesel models carried a TURBODIESEL trunk/boot lid label. In 1996, the S-Class coupé was renamed again as CL-Class into its own model range.
The W140 series S-Class was superseded by the W220 S-Class sedan and C215 CL-Class coupé in 1998 after an eight-year production run. Production of the W140 reached 432,732, with 406,710 sedans and 26,022 coupes.

History

Development of the W140 began in 1981, with official introduction originally set for September 1989. Several different design proposals were studied from 1982 until 1986, when a definitive design proposal by Olivier Boulay was selected on 9 December 1986. Several engineering prototypes were evaluated from early 1987, with the final exterior design locked in September 1987. The design patents were filed on 23 February 1988 in West Germany and 23 August 1988 in the United States. The lead designer Bruno Sacco attributed Jaguar's XJ40 sedan and BMW's E32 7-Series as a major influence on the W140's design. The initial exterior design proposal called for the two different cooling grille designs to denote the lower and upper model, similar to the idea of round and rectangle headlamps on the W123. Innovative metal-forming technology allowed the extension of the engine hood/bonnet to the front bumper, with the grille placed inside the extruded metal. The W140 became the second model after the R129 to have this extruded metal grille.
When BMW introduced a new 7-Series in 1986, the first post-war German passenger V12 engine was offered. This surprise announcement forced Mercedes-Benz to delay the introduction of the W140 by eighteen months to 1991. The delay allowed Mercedes-Benz to develop the new V12 engine and to rearrange the engine bay to accommodate the larger V12 engine, along with upgrading the brake system. The final development prototypes were completed in June 1990, with pilot production models being built from June 1990 to January 1991.
The project's cost overruns and eighteen-month delay resulted in the departure of Wolfgang Peter, the chief engineer of Mercedes-Benz. The price of a W140 was considerably higher than its predecessor, the W126, leading to slow sales during the recession of 1990-1994.
The slow sales of the W140 can also be attributed to a wave of Japanese luxury cars that were introduced before the W140 was launched. While the base price of a six-cylinder 300SE was $71,500 in 1992, the Lexus LS400 started at $44,300, the Infiniti Q45 started at $43,600, and the Acura Legend started at $28,800. This led many prospective W140 buyers to switch to its Japanese competitors due to their lower prices, lower maintenance costs, and in the case of the LS400, an ownership experience that was just as good if not better than its European competitors.
As a result of the price increases and stiff competition, Mercedes-Benz shifted from "engineer's design" to "market-driven design" in the 1990s. Many enthusiasts argue that the W140 was the "last true S-Class," as its successor, the W220, was criticized for having inferior engineering, and in the case of early models, poor reliability.
Two engines, a stillborn V16 engine based on an elongated V12 engine and an 8.0 W18 engine meant for a hypothetical 800 SEL/S 800 were, again, developed in response to the purported rumour of BMW exploring a V16 engine and testing it in a 7-Series mule, named Goldfisch V16. The W18 did not proceed past the blueprint stage, but Mercedes-Benz had a small fleet of 85 W140 prototypes with V16 engines. Due to the increasing concern for climate protection and fear of sending a wrong message to the public in the early 1990s, the V16 engine was quietly cancelled.
In March 1994, the updated W140 was unveiled at the 1994 Geneva Auto Salon and went on sale in April 1994.
In 1995, the two tone exterior appearance was made to be monotone, low-beam xenon headlamps were added and the rear indicator lenses became clear. The change was later introduced in June 1996 as 1996.5 models in Europe and 1997 models in the United States.
The W140 received notoriety in 1997 when Diana, Princess of Wales died in a car crash, involving an S 280 model, in a Paris tunnel. The car also received attention when Eduard Shevardnadze, President of Georgia, was hit by an RPG while travelling in the car and survived.
The W140 S-Class was notable for being the first Mercedes-Benz model to be sold in the United States with ECE headlamps. United States had revised its FMVSS 108 to allow the ECE headlamps and H4 and H1 bulbs.

Models

The three body types are carried over from the W126: four-door sedan/saloon in two wheelbase lengths and one two-door coupé. The model types are assigned as W140 for standard wheelbase, V140 for long wheelbase, and C140 for coupé. In 1996, the S-Class coupé was renamed as CL-Class and spun off from the S-Class. A longer Pullman version with 4140 mm wheelbase was introduced in 1995 with two engine choices. The S 600 Pullman could be ordered with an armour package.
The Sultan of Brunei ordered eighteen S 73 T station wagons/estates with AMG-prepared M120 7.3-litre V12 engines producing and to be built, with ten units delivered. The S 73 T had either an S-Class coupé front end or the normal S-Class sedan front, and the rear part of an S210 station wagon/estate installed, and taillights from the S-Class sedan.
A one-off custom-built S 500 lang Landaulet Popemobile was built for Pope John Paul II in 1997.

Features

Safety

The W140 S-Class introduced noted safety innovations.
  • Braking system. The V8 and V12 W140 models distributed more braking power to the rear wheels, increasing stopping effectiveness. In 1996, the W140 received Brake Assist System BAS, which engaged during emergency maneuvers to boost braking power to maximum.
  • Electronic Stability Program was introduced in 1995 on the Mercedes-Benz S 600 Coupé. ESP used on-board computers to improve vehicle handling response during difficult driving conditions. This was a Mercedes developed system, which has since been licensed to other manufacturers.
  • Xenon High-intensity discharge headlights were introduced in 1995.
  • Door mounted Side Airbags and seat occupancy sensors were introduced in 1996 for the 1997 Model Year.
  • Automatic windscreen wipers with rain sensors were introduced in 1996.

    Comfort and convenience

W140 features included:
  • Double paned soundproofed glass was a new S-Class innovation first fitted on the W140. This form of window glazing allowed for improved soundproofing, reduced condensation, and other insulation benefits.
  • Electrically operated exterior mirrors could be folded by switch to ease driving in narrow spaces.
  • 'Parameter steering' was a system which made low-speed driving easier by reducing the effort required to maneuver in speed-sensitive situations such as parking.
  • Rear-parking markers, or guide rods. These rods extended from the rear corners of the trunk lid when in reverse, providing the driver with a guideline for rear maneuvers. In 1995, this system was replaced by the sonar-based Parktronic system which measured the distance of the bumpers to nearby obstacles.
  • 12-way powered, heated front seats, with 3 setting memory functions and lumbar support.
  • Windshield wipers with heated washer system. Later models also included rain-sensing windshield wipers.
  • Electrically operated automatic-dimming inside rear-view mirror that tied into the seat and steering wheel memory.
  • Heated exterior mirrors. Later models also included auto-dimming driver's side mirror.
  • Orthopedic seats were an expensive option from the factory that consisted of several different air cushions in the seat that the user can inflate and deflate to find the perfect driving position.
  • Dual-zone climate control. Four-zone climate control on LWB models.
  • Reclining and heated rear seats on LWB models. V12 models also have the four-place seating option, which allows fully adjustable rear seats, lumbar support and rear sunshade control. The center seat has been replaced by a burlwood center console, allowing a 2 + 2 seating format.
  • The climate control system could be set to operate for 20 minutes after the engine had been turned off.
  • Electric rear sunshade.
  • Rear passenger illuminated vanity mirrors.
  • Soft-closing doors and trunk.
  • Leather interiors and burl inserts.
  • In 1995 the S 600 Coupe became the first Mercedes car with a GPS navigation system, designated Auto Pilot System APS. It featured CD-ROM maps and full color navigation display in the center dashboard.
  • In 1996 the Linguatronic voice control system and Parktronic sonar-based parking system were introduced.
  • In 1997 the TELEAID emergency and tracking system was introduced in the US market.
  • Also, developed with the car, a Bose sound system was available as an option.

    Drivetrain technologies

  • First introduction of CAN bus.
  • The W140 featured a newly developed front axle double wishbone suspension and a rear independent multi-link suspension.
  • In 1991 the first generation of the hydropneumatic ADS was introduced. It adjusted the damping level of the shock absorbers to help stabilize the car during high speed driving, aggressive driving, or if the driver loses control of the vehicle. Became standard on V12 models and optional for V8 models.
  • In 1996 self-levelling suspension was integrated with ADS.
  • A new diesel inline six engine with four valves per cylinder, a first for Mercedes-Benz, was introduced in 1996 as S 300 TURBODIESEL.