The Mercedes-Benz W124 represents a pivotal era for the German automaker, produced from 1985 to 1996. The facelifted version, introduced in 1989, refined the already successful W124 platform, solidifying its reputation for build quality, durability, and understated luxury. The 250 D CAT model, equipped with a 2.5-liter diesel engine and automatic transmission, was a popular choice in European markets, offering a balance of fuel efficiency and comfortable cruising. While not officially sold in the United States during its production run, the W124 has gained a dedicated following among American enthusiasts due to its robust engineering and timeless design.
The Mercedes-Benz W124: A Legacy of Engineering
The W124 was designed as a successor to the W201 (190E) and W123 models, aiming to bridge the gap between compact and full-size Mercedes-Benz offerings. The 1989 facelift brought subtle but significant changes, including revised styling, improved safety features, and updated engine options. The 250 D CAT, specifically, was designed to meet increasingly stringent European emissions regulations with the addition of a catalytic converter (“CAT” designation). This model appealed to buyers seeking a practical, reliable, and relatively economical sedan for long-distance travel and daily commuting.
Engine & Performance
The heart of the 250 D CAT is its OM 602 D 25 inline five-cylinder diesel engine, displacing 2.5 liters (2497 cm³ or 152.38 cu. in.). This engine produces 90 horsepower (Hp) at 4600 rpm and 158 Nm (116.53 lb.-ft.) of torque between 2600-3100 rpm. While not a performance-oriented vehicle, the 250 D CAT delivers adequate power for comfortable highway driving and city commuting. The engine’s precombustion chamber injection system contributes to its efficiency and relatively quiet operation for a diesel engine of its era. Acceleration from 0 to 100 km/h (0-62 mph) takes approximately 17 seconds, and it achieves a maximum speed of 170 km/h (105.63 mph). Fuel economy is a strong point, with figures of 8.8 l/100 km (26.7 US mpg) in urban conditions and 5.9 l/100 km (39.9 US mpg) on the open road. The engine is paired with a four-speed automatic transmission, providing smooth and effortless gear changes.
Design & Features
The W124 250 D CAT is a four-door sedan with a classic, understated design. Its body is characterized by clean lines, a relatively upright stance, and a focus on practicality. The 1989 facelift brought minor cosmetic updates, including a revised front grille and updated interior trim. The interior is well-appointed, with comfortable seating for five passengers. Key features include hydraulic power steering, disc brakes on all four wheels, and an Anti-lock Braking System (ABS) for enhanced safety. The W124 was renowned for its robust build quality and attention to detail, making it a durable and long-lasting vehicle. The independent multi-link rear suspension contributes to a comfortable ride, while the front wishbone suspension provides stable handling. The vehicle’s dimensions are 4740 mm (186.61 in.) in length, 1740 mm (68.5 in.) in width, and 1428 mm (56.22 in.) in height, with a wheelbase of 2800 mm (110.24 in.).
Technical Specifications
| Brand | Mercedes-Benz |
| Model | W124 |
| Generation | W124 (facelift 1989) |
| Type | 250 D CAT (90 Hp) Automatic |
| Start of production | September, 1989 |
| End of production | July, 1993 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Sedan |
| Seats | 5 |
| Doors | 4 |
| Fuel consumption (urban) | 8.8 l/100 km (26.7 US mpg) |
| Fuel consumption (extra urban) | 5.9 l/100 km (39.9 US mpg) |
| Fuel Type | Diesel |
| Acceleration 0 – 100 km/h | 17 sec |
| Acceleration 0 – 62 mph | 17 sec |
| Acceleration 0 – 60 mph | 16.2 sec |
| Maximum speed | 170 km/h (105.63 mph) |
| Weight-to-power ratio | 15.4 kg/Hp |
| Weight-to-torque ratio | 8.8 kg/Nm |
| Power | 90 Hp @ 4600 rpm |
| Torque | 158 Nm @ 2600-3100 rpm (116.53 lb.-ft.) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | OM 602 D 25 / 602.912 |
| Engine displacement | 2497 cm³ (152.38 cu. in.) |
| Number of cylinders | 5 |
| Engine configuration | Inline |
| Cylinder Bore | 87 mm (3.43 in.) |
| Piston Stroke | 84 mm (3.31 in.) |
| Compression ratio | 22:1 |
| Number of valves per cylinder | 2 |
| Fuel injection system | Precombustion chamber injection |
| Engine aspiration | Naturally aspirated |
| Valvetrain | SOHC |
| Engine oil capacity | 7 l (7.4 US qt | 6.16 UK qt) |
| Coolant capacity | 9.5 l (10.04 US qt | 8.36 UK qt) |
| Kerb Weight | 1390 kg (3064.43 lbs.) |
| Max. weight | 1970 kg (4343.11 lbs.) |
| Max load | 580 kg (1278.68 lbs.) |
| Fuel tank capacity | 70 l (18.49 US gal | 15.4 UK gal) |
| Length | 4740 mm (186.61 in.) |
| Width | 1740 mm (68.5 in.) |
| Height | 1428 mm (56.22 in.) |
| Wheelbase | 2800 mm (110.24 in.) |
| Front track | 1501 mm (59.09 in.) |
| Rear track | 1491 mm (58.7 in.) |
| Drivetrain | Rear wheel drive |
| Number of gears | 4 |
| Gearbox type | Automatic transmission |
| Front suspension | Wishbone |
| Rear suspension | Independent multi-link |
| Front brakes | Disc |
| Rear brakes | Disc |
| Assisting systems | ABS |
| Steering type | Cone worm with recirculation balls |
| Power steering | Hydraulic |
| Tires size | 195/65 R15 |
| Wheel rims size | 6.5J x 15 |
The Mercedes-Benz W124 250 D CAT remains a highly regarded vehicle, appreciated for its engineering excellence, durability, and comfortable driving experience. Its enduring appeal has established it as a classic among Mercedes-Benz enthusiasts and a testament to the brand’s commitment to quality and innovation.
