🏷️ Basic Information Identification Make: Mercedes-Benz Model: 500SEL Body Style: Sedan (Long Wheelbase) Generation Generation Name: W126 Generation Code: W126 Series II Codes Model Code: 500SEL 👋 Introduction Market Position Positioning: Flagship luxury sedan of its era, targeting discerning buyers valuing comfort, performance, and build quality. Competitive Analysis Competitors: BMW 7 Series, Jaguar XJ, Cadillac Fleetwood, Rolls-Royce Silver Spirit. Key Features Distinctive Attributes: Exceptional ride comfort, robust V8 engine, meticulous build quality, sophisticated engineering, long-wheelbase for enhanced rear passenger space. 📋 Manual Details Coverage Areas Engine: M117 5.0L V8 Transmission: 4-Speed Automatic (722.3) Chassis Suspension: Independent Front & Rear Suspension, Self-Leveling Rear Suspension (SLS) Brakes: Front & Rear Disc Brakes, ABS Electrical System: Complete Electrical Schematics, Lighting, Ignition, Starting, Charging Body And Interior: Body Panels, Doors, Windows, Seats, Climate Control Fuel System: Fuel Injection System (Bosch K-Jetronic) Cooling System: Radiator, Fan, Water Pump, Thermostat Exhaust System: Exhaust Manifolds, Catalytic Converters, Mufflers Steering: Power Steering System HVAC: Automatic Climate Control System Page Count Estimated Pages: 1000+ Manual Type Type: Workshop Service Repair Manual Language Language: English Format Format: Downloadable PDF 📖 Manual Coverage Systems Covered Powertrain: Engine overhaul, timing, fuel, ignition, cooling, exhaust Drivetrain: Transmission repair, differential, driveshafts Braking: Brake pad/rotor replacement, caliper overhaul, ABS diagnostics Steering Suspension: Power steering pump, steering rack, shock absorber replacement, SLS repair Electrical: Wiring diagrams, starter, alternator, battery, fuses, relays, lighting Climate Control: AC system recharge, heater core replacement, climate control module Body And Trim: Door panel removal, window regulator repair, seal replacement Procedures Included Maintenance: Oil changes, filter replacements, fluid checks, tune-ups Troubleshooting: Diagnostic procedures for common and uncommon issues, fault code interpretation Repair: Engine component replacement, transmission overhaul, brake system repair, electrical component repair Diagnostics: Component testing, system diagnostics, wiring schematic interpretation Rebuilds: Detailed engine and transmission rebuild procedures Technical Depth Depth: Comprehensive, covering routine maintenance to complete engine and transmission rebuilds, including detailed diagnostics and troubleshooting trees. 📊 Manual Specifications File Format Digital Format: PDF Print Quality Scanned Quality: High-resolution scans, clear text and diagrams Binding Type Digital Binding: Not applicable (downloadable digital file) Paper Type Digital Paper Emulation: Simulated pages for easy navigation ⚙️ Engine Specifications Primary Engine Engine Code: M117 Engine Type: SOHC V8 Displacement: 5.0 Liters (4973 cc) Performance Horsepower Net: Approximately 227 hp @ 4750 rpm (US Spec) Torque Net: Approximately 294 lb-ft @ 3250 rpm (US Spec) Fuel System Injection System: Bosch K-Jetronic Mechanical Fuel Injection Fuel Type: Unleaded Gasoline Engine Management Ignition System: Electronic Ignition 🔧 Transmission Standard Type: 4-Speed Automatic Transmission Model: 722.3 Features Torque Converter Lockup: Lock-up torque converter for improved efficiency 📐 Dimensions Exterior Length: 5088 mm (190.5 in) Width: 1798 mm (70.8 in) Height: 1440 mm (56.7 in) Wheelbase: 3074 mm (121.0 in) Weights Curb Weight: Approx. 1820 kg (4012 lbs) 🛡️ Safety Features Ratings NHTSA Impact: Not specifically rated under modern standardized testing, but known for robust safety cage construction. Active Features ABS: Anti-lock Braking System (ABS) Passive Features Airbags: Driver-side airbag standard from late 1984. Seatbelts: Three-point automatic seatbelts front and rear. Structural: Reinforced passenger compartment, crumple zones. 💡 Technology Features Infotainment Audio System: Factory AM/FM stereo with cassette player, optional CD changer. Climate Control: Fully automatic climate control with electronic sensors and precise temperature regulation. Driver Assistance Cruise Control: Standard cruise control system. Memory Seats: Optional electrically adjustable front seats with memory function. Connectivity Original Connectivity: Limited to factory audio and communication systems (no modern Bluetooth or smartphone integration). 🔧 Maintenance Service Intervals Oil Change: Typically every 7,500 - 10,000 miles or 12 months. Transmission Fluid: Recommended replacement every 30,000 - 50,000 miles. Coolant Flush: Every 2-3 years or 30,000 miles. Fluid Specifications Engine Oil: SAE 15W-40 or 15W-50 (API SG or higher) - Refer to owner's manual for specific climate recommendations. Transmission Fluid: MB 236.1 or 236.2 ATF (Automatic Transmission Fluid) Coolant: MB 325.0 (Glysantin G48) or equivalent ethylene glycol-based coolant with corrosion inhibitors. Brake Fluid: DOT 3 or DOT 4 brake fluid Known Issues Common Problems: Head gasket leaks (M117), fuel distributor issues (K-Jetronic), vacuum hose degradation, SRS warning light (early models), SLS hydraulic leaks, window regulator failures. Filter Part Numbers Oil Filter: Mann W916, Mahle OC202, Bosch 0451103253 (example - always verify with VIN) Air Filter: Mann C34132, Mahle LX34, Bosch 1457433033 (example - always verify with VIN) 📚 Vehicle History Brand Heritage Mercedes Benz Legacy: Renowned for engineering excellence, durability, and pioneering automotive safety and luxury features. Model Evolution W126 Development: Successor to the W116 S-Class, refined aerodynamics, improved safety, and updated technology. W126 Series II facelift (introduced 1985) brought aesthetic and technical updates. Production Production Years: 1979-1991 (W126 generation). 1984-1985 specifically for this manual's coverage. Manufacturing Location: Germany 🏆 Awards & Recognition Recognitions Vehicle Accolades: Consistently ranked among the finest luxury sedans of the 1980s by automotive journalists for its engineering, comfort, and reliability....