1989 Mercedes-Benz S124 250 TD (94 Hp) Automatic

The Mercedes-Benz S124 250 TD represents a significant chapter in the history of premium executive automobiles, specifically within the highly acclaimed W124 generation. This particular variant, a station wagon (known as an “estate” in many markets), was produced for a brief period from February to August 1989. As part of the W124 series, which debuted in 1984, the S124 chassis code designated the wagon body style, a highly practical and durable offering from the German automaker. While the W124 sedan and coupe models saw widespread global distribution, including a strong presence in the United States, the diesel S124 wagon, like the 250 TD, was primarily a staple of the European market, where diesel engines and versatile wagons held immense popularity for their combination of efficiency, durability, and cargo-carrying capability. It embodied Mercedes-Benz’s commitment to robust engineering, timeless design, and passenger comfort, establishing a benchmark for its segment.

Powertrain & Engine Architecture

Under the hood of the Mercedes-Benz S124 250 TD lies a powerplant renowned for its longevity and modest, yet reliable, performance: the OM 602 D 25 / 602.912 engine. This is a 2.5-liter (2497 cubic inches) inline five-cylinder, naturally aspirated diesel engine. Mercedes-Benz’s choice of a five-cylinder configuration was notable, offering a balance between the smoothness of a six-cylinder and the packaging benefits of a four-cylinder, while delivering characteristic diesel torque.

The engine produced a conservative 94 horsepower (hp) at 4600 revolutions per minute (rpm), a figure that, by modern standards, might seem humble. However, its true strength lay in its torque output: 116.53 pound-feet (lb.-ft.) available across a broad and usable range of 2600-3100 rpm. This low-end torque was crucial for the vehicle’s intended purpose – comfortable cruising and effortless load hauling, rather than outright speed.

Power was delivered to the rear wheels via a robust four-speed automatic transmission, a common and reliable setup for Mercedes-Benz models of this era. This drivetrain architecture prioritized smooth shifts and long-term durability over rapid acceleration. The transmission itself was a conventional hydraulic automatic, known for its simplicity and ability to withstand high mileage. Performance figures reflect this philosophy: the S124 250 TD accelerated from 0 to 60 miles per hour (mph) in approximately 17.9 seconds, with a top speed of 99.42 mph. These numbers clearly indicate that the vehicle was designed for steady, comfortable travel on autobahns and highways, not for spirited driving.

Despite its substantial curb weight of 3262.84 pounds, the 250 TD offered commendable fuel efficiency for its time and class, especially for a diesel. Fuel economy ratings were approximately 25.3 US miles per gallon (mpg) in urban driving and an impressive 37.3 US mpg on the highway. This efficiency, combined with a generous 19.02 US gallon fuel tank capacity, provided excellent cruising range, a highly desirable trait for European drivers covering long distances. The engine featured a precombustion chamber injection system and a Single Overhead Camshaft (SOHC) valvetrain, contributing to its renowned reliability and relatively quiet operation for a diesel of its generation.

Driving Characteristics

The driving experience in the S124 250 TD with the four-speed automatic transmission is characterized by smoothness and relaxed power delivery. The automatic transmission, while not offering the quickest shifts, provides seamless gear changes, contributing to a comfortable ride. The broad torque curve of the OM 602 engine means that the vehicle feels responsive at lower speeds, making it well-suited for city driving and navigating traffic. However, overtaking maneuvers on the highway require careful planning due to the relatively low horsepower output.

Compared to the manual transmission versions of the 250 TD, the automatic sacrifices some responsiveness and fuel economy. The manual gearbox allows for greater control over engine speed and gear selection, resulting in slightly quicker acceleration and improved fuel efficiency. Compared to higher-output W124 variants, such as the 260E or 300E with gasoline engines, the 250 TD Automatic is significantly slower. These gasoline models offered considerably more horsepower and torque, providing a more dynamic driving experience. However, they also came with higher fuel consumption and potentially less long-term reliability.

The gear ratios of the four-speed automatic transmission are geared towards maximizing fuel efficiency and providing comfortable cruising. First gear is relatively short, providing adequate acceleration from a standstill. Second and third gears are closely spaced, offering smooth transitions during acceleration. Fourth gear is an overdrive gear, designed to reduce engine speed and improve fuel economy at highway speeds. The overall gearing emphasizes usability and comfort over outright performance.

Equipment & Trim Levels

The S124 250 TD, while positioned as a more utilitarian offering within the W124 range, still benefited from Mercedes-Benz’s commitment to quality and comfort. Standard equipment typically included power windows, central locking, a sunroof (often optional), and a high-quality audio system. Interior upholstery was typically cloth, although leather was available as an option. The dashboard layout was functional and well-designed, with clear instrumentation and logically placed controls.

Optional extras for the 250 TD included automatic climate control, heated seats, a trip computer, and upgraded audio systems. The level of trim could vary depending on the market. In some European countries, the 250 TD was offered with a more luxurious trim package that included wood veneer trim, leather upholstery, and additional comfort features. The S124 wagon, by its nature, offered a high degree of practicality, with a large cargo area accessible through a rear hatch. The rear seats could be folded down to further increase cargo capacity.

The target audience for the 250 TD Automatic was primarily families, professionals, and individuals who valued reliability, fuel efficiency, and practicality over outright performance. It was a popular choice for those who frequently traveled long distances or needed a versatile vehicle for carrying cargo.

Chassis & Braking

The chassis and suspension of the S124 250 TD were designed to provide a comfortable and stable ride, even when fully loaded. The front suspension utilized a sturdy wishbone setup, while the rear suspension featured a sophisticated independent multi-link system, a technology that Mercedes-Benz pioneered. This multi-link design provided excellent wheel control, minimizing body roll and maximizing ride comfort.

Braking was handled by disc brakes on all four wheels, offering reliable stopping power. The S124 250 TD was equipped with Anti-lock Braking System (ABS), enhancing safety during emergency stops by preventing wheel lockup. The steering system was a cone worm with recirculation balls, augmented by hydraulic power steering, providing a precise yet comfortable steering feel. The vehicle rode on 195/65 R15 tires mounted on 9.5J x 15-inch wheel rims, a practical choice balancing comfort and durability.

Compared to lighter W124 models, the 250 TD wagon featured slightly stiffer suspension components to compensate for the increased weight. Stabilizer bars were used on both the front and rear axles to further reduce body roll and improve handling. The rear suspension was specifically tuned to handle the demands of carrying heavy loads in the cargo area.

Market Reception & Comparison

Critics generally praised the Mercedes-Benz S124 250 TD for its build quality, reliability, and fuel efficiency. While the performance was not considered particularly exciting, the vehicle was recognized as a comfortable and practical family wagon. The diesel engine was lauded for its longevity and low running costs. However, some critics noted that the automatic transmission could feel sluggish at times, and the overall driving experience lacked the dynamism of some of its gasoline-powered competitors.

In terms of fuel economy, the 250 TD Automatic consistently outperformed its gasoline counterparts. The diesel engine delivered significantly better mileage, making it a more economical choice for long-distance drivers. Reliability was another key strength of the 250 TD. The OM 602 engine was known for its robustness and ability to withstand high mileage with proper maintenance. Compared to the 260E or 300E, the 250 TD was generally considered to be more reliable, although it lacked the performance of those models.

The S124 250 TD competed against other premium wagons such as the BMW 5-Series Touring (E34 generation), the Audi 100 Avant (C3 and later C4 generations), and the Volvo 740/940 wagons. While each competitor offered its own blend of attributes, the Mercedes-Benz stood out for its unparalleled build quality, the refined comfort of its ride, and the perceived prestige of the three-pointed star.

Technical Specifications

Legacy

The Mercedes-Benz W124 series, including the S124 wagon, is widely regarded as one of the most meticulously engineered and durable automotive platforms ever produced. The Mercedes-Benz S124 250 TD, despite its relatively short production window for this specific engine and transmission combination, contributed significantly to this enduring legacy, particularly in its primary European market.

Its reputation for “over-engineering” meant that components were built to an exceptionally high standard, often exceeding the requirements of typical road use. This resulted in vehicles that could withstand hundreds of thousands of miles with proper maintenance, a testament to Mercedes-Benz’s commitment to quality during that era. The S124 wagon, with its robust diesel engine, became a favored choice for taxi fleets, long-distance travelers, and families who valued reliability, space, and economic running costs above outright performance.

In the European market, the S124 250 TD was a common sight for decades. Today, well-maintained examples are highly sought after by enthusiasts and collectors. The OM 602 diesel engine remains remarkably durable, and parts availability is generally good. While the automatic transmission may require occasional servicing, it is generally considered to be a reliable unit. The S124 250 TD represents a unique blend of luxury, practicality, and durability, making it a timeless classic that continues to be appreciated by automotive enthusiasts around the world.