🏷️ Basic Information Identification Make: Mercedes-Benz Model: 300SE Year: 1992 Codes Chassis Code: W140 Engine Code: M104.990 👋 Introduction Market Position Market Position: The 1992 Mercedes-Benz 300SE (W140 chassis) represented the pinnacle of German engineering and luxury automotive design for its era, targeting the premium executive sedan segment. This manual caters to owners and technicians maintaining this sophisticated vehicle. Competitive Analysis Competitive Analysis: Competed against flagship models from BMW (7 Series), Audi (V8/A8), Lexus (LS 400), and Jaguar (XJ). The W140 was known for its robust build quality, advanced technology, and superior ride comfort, often surpassing competitors in these areas, albeit at a higher price point. Key Features Key Features: Dual overhead camshafts, electronic fuel injection, anti-lock braking system (ABS), extensive use of sound deadening, advanced climate control, and a spacious, opulent interior. 📋 Manual Details Coverage Areas Coverage Areas: Comprehensive Service, Repair, Diagnostics, Electrical Schematics, Wiring Diagrams, Maintenance Schedules, Troubleshooting Page Count Page Count: Extensive (typical for official factory manuals, often exceeding 1500 pages in print equivalent) Manual Type Manual Type: Official Factory Service & Repair Manual Software Language Language: English Format Format: Software (likely digital, possibly PDF or proprietary application) 📖 Manual Coverage Systems Covered Systems Covered: Engine Mechanical, Engine Management (DOHC, Fuel Injection - KE-Jetronic/HFM, Ignition), Transmission (4-Speed Automatic - 722.4, possible 5-Speed - 722.5), Drivetrain, Suspension (Front Independent - MacPherson Strut, Rear Independent - Multi-Link), Brakes (ABS - Bosch), Steering (Hydraulic Power Assist), Fuel System, Cooling System, Exhaust System, Climate Control (Automatic Climate Control - THERMATIC/THERMOTRONIC), Electrical System, Body Control Modules, Lighting, Audio System, Bodywork, Interior Trim, Diagnostic Trouble Codes (DTCs), Component Testing, Component Replacement, Specifications, Torque Values Procedures Included Procedures Included: Scheduled Maintenance, General Repairs, Engine Overhaul, Transmission Overhaul, Brake System Repair, Suspension Component Replacement, Steering System Repair, Electrical System Troubleshooting, Wiring Harness Repair, Climate Control System Servicing, Diagnostic Procedures, Component Removal and Installation, Body Panel Repair, Interior Component Repair, Emissions Control System Repair Technical Depth Technical Depth: In-depth, factory-level detail including diagnostic flowcharts, component specifications, repair procedures, and torque specifications. Suitable for professional technicians and advanced DIY enthusiasts. 📊 Manual Specifications File Format File Format: Digital Software (Specific format depends on provider, often searchable PDF or proprietary executable) Print Quality Print Quality: N/A (Digital Format) Binding Type Binding Type: N/A (Digital Format) Paper Type Paper Type: N/A (Digital Format) ⚙️ Engine Specifications Primary Engine Primary Engine: 3.0L Inline-6 Cylinder (M104.990) Performance Horsepower: Approx. 217 hp @ 6000 rpm Torque: Approx. 228 lb-ft @ 4400 rpm Fuel System Fuel System: Bosch KE-Jetronic Electronic Fuel Injection with Electronic Control Engine Features Valvetrain: DOHC, 4 Valves per Cylinder Bore X Stroke: 88.5 mm x 80.2 mm Compression Ratio: 9.2:1 🔧 Transmission Standard Transmission Type: 4-Speed Automatic (722.4) Optional Transmission Type: 5-Speed Automatic (722.5, less common for 300SE) Features Transmission Features: Electronically controlled, hydraulic torque converter, lock-up clutch for efficiency Fluid Specifications Transmission Fluid Type: MB 236.1 (e.g., Mobil ATF 220, Pentosin ATF 1) 📐 Dimensions Exterior Length: Approx. 5113 mm (201.3 in) Width: Approx. 1886 mm (74.3 in) Height: Approx. 1467 mm (57.8 in) Wheelbase: Approx. 3040 mm (119.7 in) Weights Curb Weight: Approx. 1830 kg (4034 lbs) 🛡️ Safety Features Ratings Safety Ratings: NHTSA ratings for this era are not directly comparable to modern standards. Vehicle construction prioritized passive safety through robust chassis design and materials. Active Features Active Safety Features: Anti-lock Braking System (ABS) Passive Features Passive Safety Features: Reinforced safety cage, crumple zones, dual front airbags (optional/standard depending on market), seatbelt pre-tensioners, impact-absorbing steering column. 💡 Technology Features Infotainment Infotainment System: Factory-installed AM/FM radio with cassette player, optional CD changer. Features were advanced for the era, with high-quality audio components. Driver Assistance Driver Assistance Features: Cruise Control, Parking Assist (optional front sensors), rain-sensing wipers (later models/optional). Connectivity Connectivity Features: Limited by era, primarily internal vehicle system communication. External connectivity was not a feature. Comfort Features Comfort Features: Dual-zone automatic climate control (THERMATIC/THERMOTRONIC), heated and ventilated seats (optional), power-adjustable front seats with memory, power tilt/telescoping steering wheel, power windows, power sunroof, soft-close doors and trunk. 🔧 Maintenance Service Intervals Oil Change Interval: Typically every 10,000-15,000 km (6,000-9,000 miles) or 12 months, depending on driving conditions and oil type. Refer to manual for specific interval based on ASSYST system or mileage. Transmission Service Interval: Fluid and filter change recommended every 60,000-80,000 km (40,000-50,000 miles). Fluid Specifications Engine Oil Type: API SG/SH, ACEA A2-96 or MB 229.1 specification. Viscosity typically 0W-40, 5W-40, 5W-50, or 10W-40 depending on climate. Consult manual for exact recommendations. Coolant Type: MB 325.0 / 326.0 (Ethylene Glycol based, blue or green color) Brake Fluid Type: DOT 4 Known Issues Common Issues: Vacuum leaks in the pneumatic system (door locks, climate control actuators), OVP relay failure, biodegradable wiring insulation degradation, ABS sensor faults, window regulator issues, cooling system hose deterioration, BECK/APA module failures, catalytic...