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Mercedes W140 reliability

Mercedes W140 reliability

Added on: July 27, 2023
Author: OctoClub

1. Mercedes W140 modifications and AMG upgrades

2. Mercedes-Benz W140 specifications

3. Problems and faults with the Mercedes W140

4. Mercedes W140 wheel size

Mercedes W140 modifications and AMG upgrades

Mercedes W140 reliability. The Mercedes W140, also known as the Mercedes-Benz S-Class (1991-1998), has been a popular model for various modifications and upgrades, particularly with the renowned AMG (Aufrecht, Melcher, and Großaspach) performance division.

  • Engine modifications are common in the W140, and enthusiasts often opt for tuning to enhance performance. This may involve ECU (Engine Control Unit) remapping, installing performance air intakes, upgrading intercoolers, or adding aftermarket turbochargers or superchargers. These modifications aim to increase power output and improve overall engine responsiveness.
  • Suspension upgrades are also prevalent to enhance the vehicle’s handling characteristics. Lowering kits or sport springs may be employed to improve cornering stability and reduce body roll. Additionally, performance-oriented shock absorbers and sway bars might be installed to further fine-tune the vehicle’s dynamics.
  • Cosmetic modifications are popular as well, with body kits and exterior styling packages being sought after by enthusiasts. AMG, being the high-performance division of Mercedes-Benz, offers exclusive body kits with more aggressive bumpers, side skirts, and rear spoilers, giving the W140 a sportier appearance.
  • Interior customization options include upgrading the upholstery, installing high-end audio systems, and adding modern infotainment units to bring the cabin up to date with contemporary technology.
  • Furthermore, AMG upgrades for the W140 are highly sought after by enthusiasts. AMG versions of the W140 were factory-built with higher performance specifications. These models typically featured more powerful engines, sport-tuned suspensions, upgraded brakes, and distinctive AMG styling cues.

Mercedes W140

Mercedes-Benz W140 specifications

The specifications can vary depending on the specific model and engine choice, but here are some general specifications for the W140:

  • Engine Options: The W140 was available with various engine options, including inline-6, V8, and V12 engines. These engines had different displacements and power outputs.
  • Transmission: It typically came with an automatic transmission, offering smooth gear changes for a comfortable driving experience.
  • Dimensions: The W140 had a length of approximately 5.1 to 5.4 meters, width of around 1.9 meters, and a height of about 1.4 to 1.5 meters.
  • Wheelbase: The wheelbase varied between 3.0 to 3.2 meters, contributing to the spacious interior.
  • Features: As a luxury sedan, the W140 boasted a wide range of features, including advanced safety systems, luxurious interior materials, and innovative technology for its time.

Mercedes W140

Problems and faults with the Mercedes W140

While the Mercedes W140 is renowned for its luxurious and innovative features, it has been associated with some common problems and faults, as is the case with many older vehicles. Some of these issues may include:

  • Wiring Harness Problems: The early W140 models were prone to issues with the engine wiring harness, which could lead to various electrical malfunctions.
  • Suspension System: The hydraulic suspension system, known as the Self-Leveling Suspension (SLS), could be susceptible to leaks and failures.
  • Climate Control: The automatic climate control system might encounter issues, resulting in problems with heating, ventilation, and air conditioning.
  • Electronics: The complex electronic systems in the W140 could experience failures, leading to problems with various vehicle functions.
  • Rust: In some regions with harsh climates, rust could become a concern, particularly in older models that have not been properly maintained.

Mercedes W140

Mercedes W140 wheel size

The Mercedes W140 S-Class was available with various wheel sizes, depending on the model year, trim level, and optional packages chosen by the owner. The standard wheel sizes for the W140 typically ranged from 16 to 18 inches in diameter.

Here are some specific examples of wheel sizes commonly found on the Mercedes W140:

  • 16-Inch Wheels: Some entry-level models and earlier versions of the W140 came equipped with 16-inch wheels. These wheels were often paired with higher-profile tires, providing a more comfortable ride due to the increased sidewall height.
  • 17-Inch Wheels: Many mid-range and higher-trim models of the W140 were equipped with 17-inch wheels. These wheels strike a good balance between aesthetics and performance, offering improved handling compared to the smaller 16-inch wheels while still maintaining a comfortable ride.
  • 18-Inch Wheels: Some special editions and optional packages allowed for 18-inch wheels. These larger wheels contribute to a more aggressive appearance and can improve handling and grip, especially when paired with low-profile performance tires.

It’s important to note that larger aftermarket wheels might also be available for the W140, typically ranging from 19 to 21 inches, catering to owners who desire a more personalized look for their vehicle. However, when considering aftermarket wheels, it’s crucial to ensure they are compatible with the W140’s specifications and won’t adversely affect the vehicle’s handling, ride quality, or safety.

When replacing wheels or upgrading to larger sizes, it’s essential to maintain proper tire size and aspect ratio to ensure the overall diameter remains close to the original specifications. This helps maintain the accuracy of the speedometer and prevents potential clearance issues with the vehicle’s suspension and wheel wells.

If you’re considering changing the wheel size on your Mercedes W140, it’s recommended to consult with a knowledgeable automotive expert or a Mercedes-Benz dealership to ensure you make an informed decision and select the most suitable wheel size for your specific needs and preferences.


Are you already a proud owner of a Mercedes W140? If so, check out our selection of parts for this car at the following link:


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