The Mercedes-Benz S124 250 TD (90 Hp) Automatic, produced from June 1985 to February 1989, represents a significant iteration within the highly acclaimed W124 chassis series. Launched in 1984, the W124 quickly became synonymous with mid-size executive cars, celebrated for its exceptional build quality, engineering sophistication, and enduring design. The S124 designation specifically denotes the station wagon (estate) body style, offering a compelling combination of luxury, comfort, and practical versatility. This particular 250 TD Automatic model was especially popular in European markets, where its fuel-efficient diesel engine, spacious five-door configuration, and robust construction made it ideal for families, professionals, and commercial applications like taxi fleets. It stood as a durable and reliable workhorse, embodying Mercedes-Benz’s commitment to longevity during a period of rapid automotive innovation.
Powertrain & Engine Architecture
The heart of the Mercedes-Benz S124 250 TD (90 Hp) Automatic is the OM 602 D 25 / 602.912 engine, a 2.5-liter (2497 cm³ or 152.38 cu. in.) inline five-cylinder naturally aspirated diesel engine. This engine was designed with durability and efficiency as primary goals, rather than outright performance. It utilizes a precombustion chamber injection system, a hallmark of Mercedes-Benz diesel technology of the era, and a single overhead camshaft (SOHC) valvetrain with two valves per cylinder. The engine produced 90 horsepower at 4600 rpm and 113.58 lb.-ft. of torque at 2800 rpm. These figures, while modest by modern standards, were sufficient for the S124’s intended purpose: comfortable, reliable, and economical transportation.
The OM 602 engine boasts a high 22:1 compression ratio, contributing to its consistent performance and extended service life. Power is delivered to the rear wheels through a smooth-shifting 4-speed automatic transmission, a common feature in luxury vehicles of the 1980s, prioritizing driving refinement and ease of operation. This transmission was chosen for its smooth operation and suitability for long-distance cruising.
Driving Characteristics
The Mercedes-Benz S124 250 TD (90 Hp) Automatic was not designed for sporty acceleration. Its 0 to 60 mph time was approximately 17.9 seconds, with a top speed of 99.42 mph (160 km/h). These figures reflect a vehicle optimized for steady cruising and comfortable commuting. Compared to the more powerful six-cylinder or turbocharged diesel variants of the W124, the 250 TD Automatic offered a more relaxed driving experience. The automatic transmission’s gear ratios were geared towards fuel efficiency and smooth power delivery, rather than rapid acceleration. While a manual transmission was available on other W124 models, the automatic was the preferred choice for many buyers seeking a more luxurious and effortless driving experience. The vehicle’s weight-to-power ratio of 16 kg/Hp (62.5 Hp/tonne) underscored its focus on reliability and load-carrying capacity.
Fuel economy was a significant strength of the 250 TD Automatic, achieving approximately 25.3 US mpg in city driving and an impressive 37.3 US mpg on the highway. This efficiency, combined with a 19.02 US gallon (72-liter) fuel tank, provided a substantial driving range, making it well-suited for long journeys.
Equipment & Trim Levels
The S124 250 TD Automatic typically occupied a mid-range position within the W124 lineup. Standard equipment included comfortable cloth upholstery, power windows, central locking, and a basic audio system. The interior featured a functional and ergonomically designed dashboard layout, typical of Mercedes-Benz vehicles of the era. Optional extras included leather upholstery, a sunroof, air conditioning, and upgraded audio systems. The level of standard equipment varied slightly depending on the specific market. The S124’s spacious interior and large cargo area were key selling points, offering ample room for passengers and luggage. The rear seats could be folded down to further expand the cargo capacity, enhancing its practicality.
Chassis & Braking
The S124 series benefited from a sophisticated chassis design. The front suspension utilized a wishbone setup, while the rear employed Mercedes-Benz’s innovative independent multi-link suspension. This multi-link rear axle provided exceptional stability, precise handling, and a comfortable ride, effectively isolating occupants from road imperfections. Braking was handled by disc brakes on all four wheels, ensuring confident stopping power. The hydraulic power steering system, utilizing a cone worm with recirculation balls, offered a precise and well-weighted feel. The 250 TD Automatic typically rode on 195/65 R15 tires mounted on 6.5J x 15-inch wheel rims, providing a balance of comfort and grip. The suspension was tuned to prioritize ride comfort and stability, rather than sporty handling.
Market Reception & Comparison
Critics generally praised the Mercedes-Benz S124 250 TD Automatic for its build quality, reliability, and fuel efficiency. While not the fastest or most exciting vehicle in its class, it was widely regarded as a practical and comfortable choice for families and long-distance travelers. Compared to the more powerful W124 variants, such as the 260E or 300E, the 250 TD Automatic offered a more affordable entry point into the Mercedes-Benz brand. It also provided superior fuel economy compared to the gasoline-powered models. Against competitors like the BMW 5 Series Touring and Audi 100 Avant, the S124 250 TD Automatic distinguished itself with its robust diesel engine, spacious interior, and reputation for longevity. The diesel engine was particularly appealing in European markets where fuel costs were high and diesel fuel was readily available.
Technical Specifications
| Brand | Mercedes-Benz |
| Model | W124 |
| Generation | S124 |
| Type (Engine) | 250 TD (90 Hp) Automatic |
| Start of Production | June, 1985 |
| End of Production | February, 1989 |
| Powertrain Architecture | Internal Combustion Engine |
| Body type | Station wagon (estate) |
| Seats | 5 |
| Doors | 5 |
| Fuel consumption (economy) – urban | 9.3 l/100 km (25.3 US mpg) |
| Fuel consumption (economy) – extra urban | 6.3 l/100 km (37.3 US mpg) |
| Fuel Type | Diesel |
| Acceleration 0 – 60 mph (Calculated) | 17.9 sec |
| Acceleration 0 – 100 km/h | 18.8 sec |
| Maximum speed | 160 km/h (99.42 mph) |
| Weight-to-power ratio | 16 kg/Hp (62.5 Hp/tonne) |
| Engine Power | 90 Hp @ 4600 rpm |
| Engine Torque | 154 Nm @ 2800 rpm (113.58 lb.-ft.) |
| Engine displacement | 2497 cm³ (2.5 liters / 152.38 cu. in.) |
| Number of cylinders | 5 |
| Compression ratio | 22:1 |
| Kerb Weight | 1440 kg (3174.66 lbs) |
| Fuel tank capacity | 72 l (19.02 US gal) |
| Length | 4765 mm (187.6 in.) |
| Width | 1740 mm (68.5 in.) |
| Height | 1490 mm (58.66 in.) |
Legacy
The Mercedes-Benz S124 250 TD (90 Hp) Automatic has earned a well-deserved reputation for exceptional reliability and longevity. Many examples remain on the road today, a testament to the quality of their construction and the durability of the OM 602 diesel engine. The powertrain is known for its ability to withstand high mileage with proper maintenance. In the used car market, these vehicles are increasingly sought after by enthusiasts and collectors who appreciate their classic design, robust engineering, and relatively simple mechanicals. While maintenance costs can be higher than for more modern vehicles, the S124 250 TD Automatic offers a unique driving experience and a tangible connection to a bygone era of automotive excellence. Its enduring appeal ensures that it will continue to be cherished by enthusiasts for years to come.
