🏷️ Basic Information Identification Make: Mercedes-Benz Model: S-Class Chassis Code: W140 Model Years Covered: 1991-1999 Codes Engine Codes: M104 (2.8L, 3.2L I6), M119 (4.2L, 5.0L V8), M120 (6.0L V12) Transmission Codes: 4G-TRONIC (4-speed automatic), 5G-TRONIC (5-speed automatic) 👋 Introduction Market Position Segment: Full-size luxury sedan Positioning: Flagship model, pinnacle of automotive engineering and luxury for its era Competitive Analysis Competitors: BMW 7 Series (E32/E38), Lexus LS400, Cadillac DeVille/Seville, Rolls-Royce Silver Spirit/Silver Spur Key Features Luxury Features: Double-pane glass, self-leveling rear suspension, advanced climate control, optional heated/ventilated seats, optional power rear seats, soft-close doors Engineering Highlights: Sophisticated chassis design, powerful and smooth engine options, advanced electronics for its time Manual Value Proposition Target Audience: Owners, independent repair shops, DIY enthusiasts Value Statement: Provides access to factory-level repair and maintenance information, crucial for maintaining the complex systems of the W140 📋 Manual Details Coverage Areas Coverage: All mechanical, electrical, body, and diagnostic systems Page Count Estimated Page Count: Hundreds (detailed) Manual Type Type: Factory Service and Repair Workshop Manual Language Language: English Format Format: PDF Download Device Compatibility: Windows, MAC, Tablets, Smartphones Licensing Usage License: Lifetime usage, no expiry, multi-device compatible 📖 Manual Coverage Systems Covered Powertrain: Engine mechanical, fuel system, ignition system, cooling system, exhaust system, engine control systems (ME, LH-SFI, etc.) Drivetrain: Transmission (automatic), driveline components, differential, axles Chassis: Suspension (front and rear, including self-leveling rear suspension), steering system, braking system (ABS, ASR) Electrical: Vehicle electrical system, battery, charging system, starter, lighting, power windows, power seats, power mirrors, climate control electronics, central locking, infotainment systems, SRS (airbag) system Body: Body exterior, interior trim, doors, glass, seals, body repair HVAC: Automatic climate control, heating, ventilation, air conditioning system (including refrigerant handling) Procedures Included Maintenance: Scheduled maintenance, oil changes, filter replacements, fluid checks and changes, spark plug replacement, belt inspection and replacement Diagnostics: Troubleshooting guides, symptom-based diagnostics, fault code interpretation (OBD-I, specific Mercedes diagnostic protocols) Repair: Engine component removal/installation (cylinder heads, pistons, crankshaft), transmission overhaul, brake component replacement, suspension linkage replacement, electrical component repair/replacement Installation: Component replacement and installation procedures Special Tools: Identification and usage of specialized Mercedes-Benz tools Technical Depth Depth: Comprehensive, covering from basic maintenance to advanced engine and electrical system overhauls Documentation Quality: Step-by-step instructions, detailed photos, exploded diagrams 📊 Manual Specifications File Format File Type: PDF Print Quality Print Capability: Printable (single pages or full manual) Binding Type Binding Type Digital: N/A (Digital Download) Paper Type Paper Type Digital: N/A (Digital Download) Searchability Text Searchability: Likely text-searchable (standard for professional PDFs) ⚙️ Engine Specifications Primary Engine Engine Options: 3.2L Inline-6 (M104.990, M104.992), 4.2L V8 (M119.960), 5.0L V8 (M119.970), 6.0L V12 (M120.980, M120.982) Performance Inline 6 Power: Approx. 228-279 hp (depending on variant and market) V8 Power: Approx. 275-322 hp (depending on variant and market) V12 Power: Approx. 389-408 hp (depending on variant and market) Fuel System Injection Type: Bosch LH-Jetronic or ME-Electronic Fuel Injection (depending on engine and year) Fuel Type: Premium Unleaded Gasoline (91+ octane) Cooling System Coolant Type: Mercedes-Benz approved antifreeze/coolant concentrate (e.g., G48) Engine Management ECU Type: Various, depending on engine and model year (e.g., HFM, ME 2.0, ME 2.8 for later models) 🔧 Transmission Standard Transmission Options: 4-speed automatic (4G-TRONIC), 5-speed automatic (5G-TRONIC) Gear Ratios 5G Tronic: Variable by model, refer to manual for specific ratios (e.g., 3.93/2.40/1.57/1.00/0.73 for one variant) Features Electronic Control: Electronically controlled transmission with comfort and sport modes Fluid Specifications Transmission Fluid Type: MB 236.1, MB 236.6, or MB 236.14 (depending on specific transmission and year; manual is definitive) 📐 Dimensions Exterior Wheelbase Sedan: 3,139 mm (123.6 in) Length Sedan: 5,103 mm (200.9 in) Width: 1,886 mm (74.3 in) Height Sedan: 1,487 mm (58.5 in) Weights Curb Weight: Varies by model, typically 1,900-2,300 kg (4,189-5,070 lbs) Gross Vehicle Weight Rating: Varies by model, typically around 2,500-2,800 kg Wheels Tires Wheel Bolt Pattern: 5x112 Standard Tire Sizes: 215/65 R16, 235/60 R16, 235/50 R17 (depending on model and year) 🛡️ Safety Features Ratings Crash Test Ratings: N/A (Modern standardized ratings not prevalent during its production era) Passive Features Airbags: Driver and passenger airbags (SRS) standard; optional side airbags in later models Seatbelts: Pre-tensioning seatbelts, automatic belt height adjustment Body Construction: High-strength steel safety cage Active Features ABS: Anti-lock Braking System (ABS) standard Asr: Anti-Slip Regulation (ASR) / Traction Control standard or optional Esp: Electronic Stability Program (ESP) not widely available on W140, but could be integrated into later ABS/ASR systems on some models 💡 Technology Features Infotainment Audio System: Factory premium sound systems (e.g., Becker/Bose), often with cassette player and optional CD changer. Navigation: Optional factory navigation system (COMAND predecessor) available on later models. Driver Assistance Cruise Control: Standard cruise control with electronic regulation. Parking Assistance: Optional rear parking sensors (often referred to as Parktronic or similar, though early versions) Connectivity Phone Integration: Optional integrated car phone systems. Convenience Features Key System:...