1991-1993 Mercedes-Benz S-class Long (V140) 400 SE (286 Hp) Automatic

The Mercedes-Benz S-Class Long (V140) 400 SE Automatic, produced between 1991 and 1993, represented a significant step forward in luxury and technology for the flagship Mercedes-Benz sedan. Part of the W140 generation, known for its substantial size and advanced engineering, the 400 SE occupied a middle ground in the lineup, offering a compelling blend of performance and refinement. The “Long” designation indicated an extended wheelbase, providing increased rear passenger legroom, a feature particularly valued in markets where chauffeur-driven travel was common. This variant aimed to deliver a comfortable and powerful driving experience, appealing to executives and those seeking a prestigious luxury vehicle.

Technical Specifications

Powertrain & Engine Architecture

The 400 SE was powered by the M119 E 42 engine, a 4.2-liter naturally aspirated V8. This engine, a cornerstone of Mercedes-Benz’s engineering prowess, featured a cast-iron block and aluminum cylinder heads. It employed multi-port fuel injection and a double overhead camshaft (DOHC) valvetrain, contributing to its smooth power delivery and relatively high specific output. The engine produced 286 horsepower at 5700 rpm and 410 Nm (302.4 lb-ft) of torque at 3900 rpm. The engine’s design prioritized refinement and durability over outright performance. Paired with the V8 was a five-speed automatic transmission, a robust unit designed to handle the engine’s torque and provide seamless gear changes. This transmission was not known for its sportiness, but rather for its smooth and comfortable operation, aligning with the S-Class’s luxury focus.

Driving Characteristics

The 400 SE Automatic offered a driving experience characterized by effortless cruising and strong acceleration. While not as nimble as some of its competitors, the long wheelbase and sophisticated suspension provided a remarkably comfortable ride. The automatic transmission, while smooth, did contribute to a slightly less engaging driving experience compared to the manual transmission options available on other S-Class variants. The 0-60 mph time of around 7.3 seconds was respectable for the early 1990s, and the engine’s torque ensured strong performance in everyday driving situations. The gear ratios were tuned for relaxed cruising, prioritizing fuel efficiency and minimizing engine noise at highway speeds.

Equipment & Trim Levels

The 400 SE Automatic came standard with a comprehensive array of luxury features, befitting its status as a flagship sedan. These included leather upholstery, power-adjustable front seats with memory function, climate control, a high-end audio system, and power windows and locks. The “Long” wheelbase version added significantly more rear legroom, often accompanied by optional features like rear seat entertainment systems and individual climate controls. Optional extras included a sunroof, upgraded audio systems, and various wood trim options for the interior. The exterior typically featured chrome accents and alloy wheels.

Chassis & Braking

The V140 S-Class featured a double wishbone front suspension and an independent multi-link rear suspension with a stabilizer bar, providing a comfortable and controlled ride. The 400 SE was equipped with ventilated disc brakes on all four wheels, along with an Anti-lock Braking System (ABS) as standard equipment. The steering was a hydraulic power-assisted worm-reduction unit, offering a smooth and precise feel. The tires were typically 235/60 R16, providing a good balance of comfort and grip.

Market Reception & Comparison

The 400 SE Automatic was generally well-received by critics, who praised its luxurious interior, comfortable ride, and powerful engine. However, some reviewers noted that the automatic transmission lacked the responsiveness of the manual options. Compared to the 300 SE (with its inline-six engine), the 400 SE offered significantly more power and refinement. Compared to the higher-performance 500 SE, the 400 SE provided a more balanced combination of performance and fuel economy. Fuel economy was rated at around 18.8 US mpg combined, which was typical for a large luxury sedan of that era. Reliability was generally good, although the complex electronics of the V140 generation could occasionally present challenges.

Legacy

The Mercedes-Benz S-Class Long (V140) 400 SE Automatic remains a sought-after classic car today, appreciated for its luxurious features, robust engineering, and timeless design. The M119 engine is known for its durability, and well-maintained examples can still provide years of reliable service. However, like all cars of this age, they require regular maintenance and attention to detail. Parts availability can be a concern, but a dedicated network of enthusiasts and specialists exists to support owners. The V140 S-Class, and the 400 SE variant in particular, represents a high point in Mercedes-Benz engineering and a benchmark for luxury sedans.