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Mercedes Benz Mercedes Benz W124

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Mercedes-Benz W124: The Over-Engineered Icon

The Mercedes-Benz W124, produced from 1984 to 1997, is widely considered one of the most well-engineered and durable automobiles ever built. It represents a high point in Mercedes-Benz's commitment to quality and longevity. The W124 was a mid-size luxury car, positioned between the compact 190 (W201) and the larger S-Class (W126, later W140). It was available in a variety of body styles including sedan, coupe, convertible, estate (wagon), and a long-wheelbase limousine.

Generations and Key Changes

1984-1989 (Series 1)

  • Years: 1984-1989
  • Key Features: First introduced. Characterized by a more angular design. Typically had flat-faced dashboard trim in Zebrano wood. Engine options included a range of inline-four, inline-six, and diesel engines. Single windshield wiper with eccentric mechanism.
  • Models: Included 200, 200E (introduced later), 230E, 260E, 300E, 200D, 250D, 300D.

1989-1993 (Series 2 - Facelift)

  • Years: 1989-1993
  • Key Features: Facelifted model with more modern styling. The most noticeable change was the addition of plastic cladding along the lower doors and wings, designed to provide better protection against stone chips and minor damage. Improved interior trim, often with burl walnut wood replacing Zebrano. Introduction of the 4MATIC all-wheel-drive system on some models.
  • Models: Included 200E, 220E, 230E, 260E, 280E (replaced 260E), 300E, 300E-24, 400E/E400, 500E/E500 (introduced later), 200D, 250D, 300D, 300D Turbo.

1993-1996 (Series 3 - Final Facelift & Name Change)

  • Years: 1993-1996 (sedan and estate); Coupe and convertible continued until 1997.
  • Key Features: Minor styling tweaks. Most importantly, the model designation was changed. The "E" was now placed *before* the numerical designation to reflect the car's positioning within the Mercedes-Benz range (e.g., E220 instead of 220E). Improved safety features, including standard driver's side airbag. Engine improvements, including updated fuel injection systems.
  • Models: E200, E220, E280, E320, E420, E500, E200 Diesel, E220 Diesel, E250 Diesel, E300 Diesel.

Reliability & Common Issues

The W124 enjoys a reputation for exceptional reliability, but as with any car of this age, certain issues are more common than others. Regular maintenance is key to keeping a W124 running smoothly.

Engine

  • M102/M103/M104 Inline-Four/Six Engines: These engines are generally very robust. Common issues include:
    • Wiring Harness Degradation: The engine wiring harness is a known weak point, especially on models from the early to mid-1990s. The insulation deteriorates, leading to shorts and misfires. Replacing the harness is a must on many cars.
    • Fuel Injector Issues: Injectors can become clogged or leak over time.
    • Overheating: Check the cooling system thoroughly, including the radiator, water pump, thermostat, and viscous fan clutch. A neglected cooling system can lead to head gasket failure.
    • Timing Chain (M103/M104): While durable, the timing chain and tensioner should be inspected, especially on higher-mileage examples.
    • Head Gasket (M104): This engine is more prone to head gasket leaks than the M103, especially if the engine has been overheated.
  • Diesel Engines (OM601/OM602/OM603): Known for their incredible longevity. Common issues include:
    • Fuel Injection Pump Issues: The injection pump can leak or require rebuilding over time.
    • Glow Plugs: Glow plugs need to be replaced periodically to ensure proper cold starting.
    • Vacuum Pump Leaks: The vacuum pump, used for braking and other systems, can develop leaks.
    • Turbocharger (OM603 Turbo): Check for excessive oil consumption and proper boost pressure on turbocharged models.

Transmission

  • Automatic Transmissions: Generally reliable, but require regular fluid changes (every 30,000-40,000 miles). Delayed or harsh shifting indicates potential problems.
  • Manual Transmissions: Less common, but generally very durable. Check for clutch wear and smooth shifting.

Suspension & Steering

  • Front Suspension: Ball joints, control arm bushings, and tie rod ends can wear out. Inspect for play and excessive noise.
  • Rear Suspension: Self-leveling suspension (SLS) on estate models is prone to leaks. Accumulators (spheres) need to be replaced periodically. The system can be expensive to repair. Standard rear suspension is more robust.
  • Steering: Power steering pumps and steering boxes can leak. Check for smooth steering and proper alignment.

Brakes

  • Brake System: ABS issues can occur, often due to sensor problems. Inspect brake lines for corrosion.

Electrical

  • Wiring Harnesses: As mentioned previously, wiring harness degradation is a major concern.
  • Central Locking System: Vacuum-operated central locking systems can develop leaks, leading to slow or inoperative locking.
  • Climate Control: The climate control system can be complex and expensive to repair. Check for proper function of the AC compressor, blower motor, and heater core.
  • Instrument Cluster: The instrument cluster can suffer from flickering lights or inoperative gauges.

Body & Interior

  • Rust: While generally well-protected, the W124 can be susceptible to rust in areas such as the wheel arches, door bottoms, and around the jacking points. Thoroughly inspect the body for any signs of corrosion.
  • Interior: Check for wear and tear on the seats, carpets, and dashboard. Sun damage can cause cracking of the dashboard.

Driving Experience

The W124 offers a refined and comfortable driving experience. It's known for its solid build quality, comfortable ride, and precise handling. The driving experience varies depending on the engine and model.

Pros:

  • Solid and Well-Built: The W124 feels incredibly solid and well-built.
  • Comfortable Ride: The suspension provides a comfortable and composed ride, even on rough roads.
  • Precise Handling: The steering is precise and responsive, providing good feedback.
  • Reliable (with proper maintenance): With proper maintenance, the W124 can provide years of reliable service.
  • Variety of Body Styles: The W124 was available in a variety of body styles to suit different needs.

Cons:

  • Age: As with any car of this age, parts may be difficult to find or expensive.
  • Potential for High Repair Costs: Certain repairs, such as wiring harness replacement or SLS system repairs, can be expensive.
  • Fuel Economy: Fuel economy can be relatively poor, especially on larger-engined models.
  • Not the Fastest Car: While some models (e.g., 500E/E500) are very quick, many W124s are not particularly fast.

Buying Advice

Years to Look For:

  • 1993-1996 (Series 3): These models offer the most updated styling, improved safety features, and revised engine designations. They also often have more readily available parts compared to earlier models.
  • Late Production (Post-1995): These cars are generally in better condition due to their later build dates and are less likely to suffer from early production issues. The coupes and convertibles, produced until 1997, often represent the best cared-for examples.
  • E320 (M104 Engine): Provides a good balance of performance and reliability.

What to Avoid (or be cautious of):

  • Early Production Models (1984-1989): While not inherently bad, these models may have more wear and tear and require more extensive maintenance.
  • Cars with Extensive Rust: Avoid cars with significant rust, as rust repair can be expensive and time-consuming.
  • Cars with Neglected Maintenance: Look for cars with a well-documented maintenance history. Avoid cars that have been neglected or poorly maintained.
  • Cars with Extensive Electrical Problems: Electrical problems can be difficult and expensive to diagnose and repair.
  • Overpriced Examples: Research the market value of the car you are considering. Don't overpay for a W124, even if it is in excellent condition. Condition is everything.
  • Models with SLS (Self-Leveling Suspension) unless well-maintained: Estate models can be fantastic, but the SLS system needs careful inspection.

Key Checks Before Buying:

  • Wiring Harness: Inspect the engine wiring harness for cracking or crumbling insulation.
  • Rust: Thoroughly inspect the body for any signs of rust.
  • Cooling System: Check the cooling system for leaks and proper function.
  • Transmission: Test the transmission for smooth and precise shifting.
  • Suspension: Inspect the suspension for worn components and proper function.
  • Electrical System: Check all electrical components for proper function.
  • Climate Control: Test the climate control system for proper function.
  • Service History: Review the service history to ensure that the car has been properly maintained.
  • Pre-Purchase Inspection: Have the car inspected by a qualified mechanic before you buy it.

The Mercedes-Benz W124 is a classic car that offers a unique blend of luxury, reliability, and driving enjoyment. With careful research and a thorough inspection, you can find a W124 that will provide years of trouble-free motoring.

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