Segment:
Full-size Luxury Sedan
Positioning:
Flagship model of Mercedes-Benz, representing the pinnacle of automotive engineering and luxury for its era.
Key Competitors:
BMW 750iL (E32), Lexus LS400, Jaguar XJ6/XJ12.
Innovation:
Introduction of CAN-Bus communication, advanced safety features for its time, sophisticated climate control.
Luxury Appointments:
Extensive use of premium materials (leather, wood trim), advanced power accessories, spacious interior.
Service Coverage:
Comprehensive mechanical and electrical repair, maintenance, and diagnostics.
Component Coverage:
Engine, Transmission, Drivetrain, Suspension, Steering, Brakes, HVAC, Electrical Systems, Bodywork, Fuel System, Exhaust System.
Estimated Pages:
Over 1500
Type:
Official Factory Service and Repair Manual Software
Format:
Software (likely PDF or proprietary diagnostic software)
Engine Mechanical:
Detailed overhaul procedures, component testing, timing, valve adjustments, lubrication, cooling system.
Engine Management:
Fuel injection (KE-Jetronic/LH-Jetronic), ignition system, engine control unit (ECU) diagnostics, sensor testing.
Transmission:
4-speed automatic transmission (722.3 or 722.4), overhaul, adjustment, fluid service, electronic control.
Brakes:
ABS (Anti-lock Braking System), hydraulic components, caliper and rotor replacement, brake bleeding procedures.
Suspension Steering:
Front and rear suspension components, shock absorbers, springs, control arms, power steering system, steering gear.
Electrical System:
Wiring diagrams for all systems, starter, alternator, battery, lighting, power windows, central locking, comfort features.
Climate Control:
Automatic climate control (ACC), refrigerant system, blower motor, HVAC diagnostic codes.
Body And Trim:
Exterior panel replacement, interior trim removal and installation, door mechanisms, trunk lid.
Routine Maintenance:
Oil and filter changes, fluid level checks and top-offs, spark plug replacement, air filter replacement.
Diagnostic Procedures:
Troubleshooting guides for common issues, symptom-based diagnostics, fault code retrieval and interpretation.
Component Replacement:
Step-by-step instructions for replacing major and minor components across all vehicle systems.
Rebuilding Procedures:
Detailed instructions for complete engine and transmission overhauls, including specifications and torque values.
Calibration And Adjustment:
Procedures for adjusting fuel delivery, ignition timing, throttle linkage, and other critical settings.
Depth:
In-depth technical information suitable for professional technicians and experienced DIY mechanics.
Diagnostic Capability:
Includes diagnostic flowcharts, component testing procedures, and wiring diagrams for fault finding.
Schematics:
Comprehensive electrical schematics and vacuum/hydraulic diagrams.
Engine Type:
V8, SOHC (Single Overhead Camshaft), 32 valves
Displacement:
4973 cc (5.0 Liters)
Horsepower:
322 hp @ 5500 rpm (approximate)
Torque:
354 lb-ft @ 3900 rpm (approximate)
Fuel Delivery:
Bosch KE-Jetronic (Lambda controlled mechanical fuel injection) with Electronic Control Unit (ECU) for ignition and auxiliary functions.
Fuel Type:
Premium Unleaded Gasoline (91+ octane recommended)
Type:
4-speed automatic transmission (722.3 or 722.4)
Transmission Options:
None for the 500SEL model.
Electronic Control:
Electronically controlled transmission with multiple shift modes (e.g., Economy/Sport).
Fluid Type:
Dexron III (or equivalent MB spec approved fluid)
NHTSA Rating:
Not specifically rated by NHTSA for this year in modern standards.
ABS:
Standard Bosch ABS (Anti-lock Braking System).
Traction Control:
Optional (ASR - Acceleration Slip Regulation) on some models.
Airbags:
Driver airbag standard; passenger airbag optional.
Seatbelts:
Pretensioner front seatbelts.
Body Structure:
High-strength steel body structure with crumple zones.
Audio System:
High-quality factory-installed sound system, often with premium brands like Becker or Bose. Cassette player standard.
Navigation:
Early navigation systems were optional and rudimentary by modern standards (e.g., map-based systems).
Cruise Control:
Standard electronic cruise control.
Parking Aid:
Optional parking assistance system (early sensors).
Cellular Integration:
Optional factory-installed car phone or provisions for aftermarket installation.
Oil Change Interval:
Typically every 10,000-15,000 km (6,000-9,000 miles) or 12 months, whichever comes first.
Transmission Service:
Fluid and filter change every 50,000-80,000 km (30,000-50,000 miles).
Engine Oil:
SAE 0W-40 or 5W-40 synthetic oil meeting MB 229.5 specification (check manual for exact specification).
Coolant:
Mercedes-Benz approved antifreeze/coolant concentrate (e.g., G05 or equivalent) mixed 50/50 with distilled water.
Brake Fluid:
DOT 4 synthetic brake fluid.
Wiring Harness:
Biodegradable insulation on engine wiring harnesses can degrade, leading to electrical faults. Harness replacement is often required.
Mass Air Flow Sensor:
Can become contaminated or fail, affecting engine performance and fuel economy.
Climate Control Actuators:
Plastic gears in HVAC blend door actuators can fail, leading to temperature or airflow issues.
Door Locks And Vacuum System:
Vacuum leaks in the central locking system or faulty vacuum pump can cause door lock malfunctions.
Suspension Components:
Age-related wear on bushings, ball joints, and shock absorbers.
Heritage:
Mercedes-Benz has a long-standing reputation for engineering excellence, luxury, safety, and durability.
Generation:
First generation of the W140 chassis S-Class, replacing the W126 S-Class. Marked a significant technological leap.
Development Focus:
Emphasis on new technologies, safety, comfort, and a distinct, imposing presence.
Production Years:
1991-1998 (for W140 chassis)
Manufacturing Location:
Germany (Sindelfingen plant)
Industry Recognition:
The W140 S-Class was recognized for its advanced technology, build quality, and comfort, though its styling was debated.
Consumer Ratings:
Generally praised for engineering and durability, but criticized for high maintenance costs when not properly maintained.
Manual Certification:
Officially Licensed Service and Repair Manual Software.
