Market Position:
The Mercedes-Benz W124 series represented the pinnacle of mid-size luxury sedans and estates during its production run, renowned for its robust engineering, build quality, and advanced technology for its era. It competed with established luxury marques like BMW, Audi, and higher-tier models from American and Japanese manufacturers.
Competitive Analysis:
The W124 was lauded for its superior ride comfort, advanced independent suspension, and excellent safety features, often setting benchmarks in its class. Its longevity and durability became a defining characteristic, making it a sought-after classic.
Key Features:
Aerodynamic design, pioneering multi-link rear suspension, advanced safety systems (optional airbags, ABS), durable powertrains, high-quality interior materials, and exceptional build quality.
Years Covered:
1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993
Models Covered:
All Sedan (W124.0xx), Coupe (A124.0xx), Convertible (A124.0xx), and Wagon/Estate (S124.0xx) variants.
Engine Variants Covered:
All petrol and diesel engine variants offered during the specified production years.
Trim And Transmission Types Covered:
All trim levels and transmission types (manual and automatic) are covered.
Page Count:
N/A (Downloadable digital format, comprehensive content)
Manual Type:
Complete Workshop Service Repair Manual
Format:
Downloadable Digital File (e.g., PDF)
Engine Systems:
Engine mechanicals, fuel system (carburetor, injection), ignition system, cooling system, lubrication system, exhaust system, engine management (ECU).
Drivetrain Systems:
Clutch, manual transmission, automatic transmission, driveshafts, differentials, axles.
Suspension And Steering:
Front and rear suspension, shock absorbers, springs, control arms, steering gear, power steering system.
Braking Systems:
Hydraulic brake system, ABS (if equipped), brake discs, pads, calipers, lines, master cylinder, parking brake.
Electrical Systems:
Battery, charging system (alternator), starting system, lighting, wipers, horn, dashboard instruments, wiring diagrams, fuse box.
Body And Chassis:
Body panels, doors, windows, locks, upholstery, interior trim, chassis frame, corrosion protection.
HVAC System:
Heating, ventilation, air conditioning (if equipped), climate control systems.
Maintenance Procedures:
Scheduled maintenance, oil changes, filter replacements, fluid checks and changes, tune-ups, spark plug replacement, belt inspection and replacement.
Repair Procedures:
Engine overhaul, transmission rebuild, brake system repairs, suspension component replacement, electrical diagnosis and repair, bodywork repairs.
Troubleshooting:
Diagnostic procedures for common and uncommon faults, fault codes interpretation (for relevant systems).
Disassembly And Assembly:
Step-by-step instructions for removing and reinstalling major components and sub-assemblies.
Specifications And Tolerances:
Detailed torque specifications, measurement tolerances, clearances, and alignment data.
Technical Depth:
Comprehensive, covering basic maintenance to complete engine and transmission rebuilds, including electrical schematics and diagnostic procedures.
File Format:
PDF (Portable Document Format)
Print Quality:
High resolution, suitable for clear printing of text and images.
Binding Type:
N/A (Digital format, user printable)
Paper Type:
N/A (Digital format, user printable on desired paper)
Searchability:
Typically text-searchable PDF, allowing quick access to specific information.
Software Requirements:
Adobe Reader or compatible PDF viewer (free download available).
Engine Options Summary:
Wide range of inline-four, inline-five, and inline-six petrol engines, as well as naturally aspirated and turbocharged diesel engines.
Representative Performance Figures:
Power outputs ranged from approximately 75 hp (diesel) to over 230 hp (e.g., 300E 24V). Torque figures varied significantly based on engine displacement and type. Specific figures depend on the exact engine variant covered by the manual.
Fuel Delivery Systems:
Bosch KE-Jetronic, K-Jetronic, and later electronic fuel injection (EFI) systems. Carbureted models were less common in later years for export markets. Diesel engines utilized Bosch injection pumps.
Engine Control Units:
Engine control units (ECU) for fuel injection and ignition timing management, with diagnostic capabilities depending on the specific model year and system.
Standard Transmission Type:
Manual transmissions (4-speed or 5-speed) were standard on many base models. Automatic transmissions were widely available and often standard on higher-spec models.
Optional Transmission Type:
Mercedes-Benz 4-speed automatic transmission (e.g., 722.3, 722.4) and later 5-speed automatic transmissions (e.g., 722.5, 722.6 in later years of the W124 platform, though the latter is less common for the early part of this manual's coverage). Options for limited-slip differentials (LSD) were also available.
Transmission Features:
Hydraulic torque converter for automatic transmissions, sophisticated valve body control for smooth shifts, and manual transmission options for driver engagement.
Exterior Dimensions:
Varies by body style (Sedan, Coupe, Wagon, Convertible). For example, a 1986 300E Sedan had an overall length of approximately 188 inches, width of 69 inches, and height of 56 inches. Exact dimensions are detailed within the manual for specific body types.
Interior Space Notes:
The W124 was known for its spacious and comfortable interior, offering ample legroom and headroom for its class.
Curb Weight:
Curb weight typically ranged from approximately 3,200 lbs to 3,800 lbs depending on engine, transmission, and body style.
Safety Ratings Notes:
While official crash test ratings from modern bodies like NHTSA or IIHS are not directly applicable to vehicles of this era in the same format, the W124 was engineered with a strong emphasis on occupant safety. It featured crumple zones, a reinforced passenger cell, and advanced safety systems for its time.
Active Safety Features:
Anti-lock Braking System (ABS) was an optional feature on most models. Power-assisted steering and responsive braking systems contributed to active safety.
Passive Safety Features:
Driver and front passenger airbags became available as options in later years of this generation. Seatbelt pretensioners, side-impact protection beams, and a robust chassis structure were standard.
Infotainment Systems:
Base models featured analog radio and cassette players. Higher trims could have more advanced sound systems, potentially with CD changers as an option in later years. Features were generally focused on audio, with limited electronic integration compared to modern vehicles.
Driver Assistance Features:
ABS (Anti-lock Braking System) was the primary driver assistance feature. Cruise control was also an option. Features like traction control (ASR) were introduced on some models later in the W124's lifecycle but are less common in the earlier covered years.
Connectivity Features:
Limited to basic antenna systems for radio reception. No Bluetooth or advanced telematics connectivity in the modern sense.
Typical Service Intervals:
Oil changes: typically every 5,000 - 7,500 miles or annually. Major service intervals (e.g., spark plugs, filters, coolant) are often around 15,000 - 30,000 miles or every 1-2 years, depending on engine type and driving conditions. Detailed schedules are in the manual.
Engine Oil Specification:
Refer to manual for specific engine type. Commonly MB 229.1 or API SG/SH rated oils (e.g., SAE 10W-40, 15W-40, 5W-40 synthetic for colder climates).
Coolant Specification:
Typically MB-approved coolant (e.g., G48 or similar ethylene glycol-based antifreeze) mixed with distilled water (50/50 ratio).
Transmission Fluid Specification Auto:
Mercedes-Benz Specification 236.1 or 236.3 for older automatic transmissions (e.g., ATF Dexron II or Dexron III equivalents). Refer to manual for exact type per transmission model.
Brake Fluid Specification:
DOT 3 or DOT 4 brake fluid.
Common Issues Electrical:
Wiring harness degradation (particularly insulation breakdown), faulty vacuum lines controlling central locking/climate control, climate control module failures, ABS sensor failures.
Common Issues Mechanical:
Head gasket leaks (especially on some inline-six engines), fuel pump failures, idle control valve issues, front suspension ball joint wear, rust in common areas (wheel arches, sills, door bottoms).
Common Issues Other:
Dashboard pixelation failure (instrument cluster), heater blower motor resistor failure, vacuum operated headlamp washers malfunction.
Brand Heritage Context:
Mercedes-Benz has a long-standing reputation for engineering excellence, safety, and luxury. The W124 continued this legacy, building upon the success of its predecessors like the W123.
Model Evolution Summary:
Introduced in 1984/1985, the W124 succeeded the W123. It was characterized by its distinctive, aerodynamic styling and extensive development for reliability and comfort. The model range expanded to include sedan, coupe, convertible, and wagon variants. Major updates included the introduction of airbags and revised styling in 1989 (often referred to as the 'facelift'). The manual covers the period from its introduction through the significant updates.
Production Period:
1984/1985 - 1995/1996 (with this manual focusing on the earlier years up to 1993).
Production Locations:
Primarily manufactured in Germany, with some assembly potentially occurring in other locations for specific markets.
Automotive Journalism Recognition:
The W124 consistently received accolades from automotive journalists for its build quality, engineering, and safety. It was often praised for its 'over-engineered' nature and exceptional durability, becoming a benchmark for mid-size luxury sedans.
Longevity And Reliability Reputation:
The W124 is widely recognized for its long-term reliability and ability to withstand high mileage, earning a strong reputation for durability and longevity. This is a key selling point for owners and enthusiasts of the model.
