1989-1993 Mercedes-Benz S124 (facelift ) 250 TD CAT (90 Hp) Automatic

The Mercedes-Benz S124 (facelift 1989) 250 TD CAT (90 Hp) Automatic represents a significant iteration within the celebrated W124 series, produced from September 1989 to July 1993. The W124, manufactured between 1984 and 1996, is renowned for its robust engineering and longevity. The S124 designation specifically denotes the estate or station wagon body style, which enjoyed considerable popularity, particularly in Europe, due to its blend of luxury, practicality, and durability. This 250 TD CAT variant occupied a mid-range position in the W124 lineup, offering a balance between affordability and the prestige associated with the Mercedes-Benz brand. It catered to buyers seeking a comfortable, reliable, and fuel-efficient vehicle for family use or business purposes.

Powertrain & Engine Architecture

The heart of the S124 250 TD CAT is the OM 602 D 25 engine, a naturally aspirated, inline five-cylinder diesel. This 2.5-liter (2497 cm³ or 152.38 cu. in.) engine was a mainstay of Mercedes-Benz’s diesel offerings during this period, prized for its dependability and fuel economy rather than outright performance. The engine features a cylinder bore of 87 mm (3.43 in.) and a piston stroke of 84 mm (3.31 in.), resulting in a substantial 22:1 compression ratio typical of diesel engines. It utilizes a precombustion chamber injection system, a common design for the era, contributing to smoother and quieter operation compared to direct injection systems.

The engine produces 90 horsepower at 4600 rpm and 158 Nm (116.53 lb.-ft.) of torque between 2600-3100 rpm. This power is delivered to the rear wheels via a four-speed automatic transmission, specifically the 722.3 series transmission. This transmission is a hydraulic control unit type, known for its smooth shifting characteristics and relative simplicity. The gear ratios are optimized for fuel efficiency and comfortable cruising, rather than rapid acceleration. First gear is relatively short for initial takeoff, while higher gears are spaced to maintain low engine speeds at highway velocities. The transmission lacks a lock-up torque converter, a feature that would become more common in later automatic transmissions.

Engine Codes and Variations

The OM 602 D 25 engine was available in several variations, but the 602.912 code specifically designates the 90 hp version used in the S124 250 TD CAT. Higher output versions of the OM 602, such as those found in the 300 TD, featured increased turbocharging and fuel delivery, resulting in significantly more power. The non-turbocharged nature of the 250 TD CAT’s engine contributes to its exceptional reliability, as it avoids the complexities and potential failure points associated with turbocharger systems.

Driving Characteristics

The driving experience in the S124 250 TD CAT Automatic is characterized by smoothness and refinement. Acceleration is unhurried, with a 0-60 mph time of approximately 17.9 seconds. However, the engine’s torque delivery provides adequate power for overtaking maneuvers and maintaining comfortable cruising speeds on the highway. The automatic transmission shifts smoothly, although it lacks the responsiveness of modern transmissions. Compared to the manual transmission versions of the 250 TD, the automatic offers greater convenience but sacrifices some fuel economy and driver engagement. Compared to the higher-performance variants like the 260E or 300E, the 250 TD CAT is significantly slower, but it compensates with superior fuel efficiency and a more relaxed driving experience.

Equipment & Trim Levels

The S124 250 TD CAT Automatic came standard with a respectable level of equipment for its time. Interior features typically included cloth upholstery, power windows, central locking, and a basic audio system. The dashboard layout is functional and ergonomically designed, with clearly labeled controls. Optional extras included leather upholstery, a sunroof, air conditioning, and upgraded audio systems. The level of trim could vary depending on the market, with some regions offering more standard features than others. The S124 generally prioritized practicality and durability over lavish luxury, although it still offered a comfortable and refined interior environment.

Chassis & Braking

The S124 250 TD CAT features a sophisticated suspension system designed to provide a comfortable ride and stable handling. The front suspension utilizes independent wishbones with coil springs and shock absorbers, while the rear suspension employs an independent multi-link setup. This configuration effectively isolates the cabin from road imperfections. Braking is handled by disc brakes on all four wheels, supplemented by an Anti-lock Braking System (ABS). The ABS system enhances braking performance and stability, particularly on slippery surfaces. Steering is hydraulic power-assisted, providing light and precise control. The car rides on 195/65 R15 tires, offering a good balance of grip and ride comfort. Rear drum brakes were sometimes fitted on lower-spec models, but the CAT variant typically featured all-round discs.

Market Reception & Comparison

The S124 250 TD CAT Automatic was well-received by critics and consumers alike. It was praised for its build quality, reliability, and fuel efficiency. While its performance was not exceptional, it was considered adequate for its intended purpose. Compared to other trims in the W124 lineup, the 250 TD CAT offered a compelling value proposition for buyers seeking a practical and economical wagon. It was more affordable than the higher-performance gasoline models, while still offering the prestige and comfort associated with the Mercedes-Benz brand. Fuel economy was a significant advantage, with the diesel engine achieving approximately 25.3 US mpg in urban driving and 37.3 US mpg on the highway. Reliability was also a key strength, with the OM 602 engine proving to be exceptionally durable.

Technical Specifications

Legacy

The Mercedes-Benz S124 250 TD CAT Automatic has earned a well-deserved reputation for long-term reliability. The OM 602 engine is known to withstand high mileage with proper maintenance. In the used car market today, these vehicles are sought after by enthusiasts and collectors who appreciate their build quality and durability. While finding well-maintained examples can be challenging, they represent a relatively affordable entry point into classic Mercedes-Benz ownership. The simplicity of the mechanical components makes them easier to repair and maintain compared to more modern vehicles. The 250 TD CAT continues to be a testament to Mercedes-Benz’s commitment to engineering excellence and a lasting symbol of automotive quality.