🏷️ Basic Information Identification Make: Mercedes-Benz Model: S Class Model Variant: S550 4MATIC Year: 2010 Codes Chassis Code: W221 Engine Code Group: M273 👋 Introduction Market Position Segment: Full-size Luxury Sedan Positioning: Flagship model, representing pinnacle of Mercedes-Benz engineering and luxury. Competitive Analysis Direct Competitors: BMW 7 Series, Audi A8, Lexus LS, Porsche Panamera (early models) Key Features Luxury Appointments: Premium materials, advanced comfort features, sophisticated design. Performance And Drivetrain: Powerful V8 engine, standard 4MATIC all-wheel drive for enhanced traction. Advanced Technology: COMAND infotainment, adaptive cruise control (DISTRONIC), PRE-SAFE® safety system. Ride Comfort: AIRMATIC semi-active air suspension system. 📋 Manual Details Coverage Areas Primary Coverage: Owner's Operations and Information Secondary Coverage: Basic Maintenance, Troubleshooting, Features Page Count Estimated Page Count: 400-500 Manual Type Type: Owner's Manual Language Language: English Format Format: Digital PDF 📖 Manual Coverage Systems Covered Powertrain Management: Engine operation, lubrication, cooling, fuel system, exhaust Drivetrain: 4MATIC all-wheel drive system operation Chassis Systems: Brake system, suspension (AIRMATIC), steering Electrical Systems: Lighting, wipers, power accessories, battery, fuses Comfort Controls: Climate control (THERMATIC/THERMOTRONIC), seats, windows, mirrors Infotainment Navigation: COMAND APS, audio system, navigation, Bluetooth connectivity Safety Systems: Airbags, seatbelts, ABS, ESP, tire pressure monitoring Driver Assistance: PRE-SAFE®, PARKTRONIC, DISTRONIC PLUS (if equipped) Procedures Included Basic Operation: Starting/stopping engine, gear selection, parking, driving aids Instrument Cluster: Understanding indicators, warnings, and displays Climate Control Operation: Adjusting temperature, airflow, recirculation, seat heating/ventilation Lighting And Wipers: Operation of headlights, fog lights, interior lighting, rain-sensing wipers Infotainment Operation: Using radio, CD/DVD player, navigation, phone integration Fueling And Fluid Checks: Proper fuel type, checking oil, coolant, washer fluid levels Tire Maintenance: Tire pressure recommendations, changing a flat tire (basic) Troubleshooting Basic: Interpreting warning lights, minor issues Technical Depth Depth: Comprehensive for owner-level understanding and basic operation. Diagnostic Capability: Limited; focuses on understanding dashboard indicators, not deep diagnostic codes. Repair Level: None; this is an owner's manual, not a repair manual. 📊 Manual Specifications File Format File Type: PDF Searchability: Likely searchable text (standard for factory PDFs) Print Quality Quality: Factory original quality (digital reproduction) Binding Type Binding: N/A (Digital) Paper Type Paper: N/A (Digital) ⚙️ Engine Specifications Primary Engine Engine Type: Naturally Aspirated V8 Engine Code: M273.961 Displacement: 5.5 Liters (5461 cc) Bore X Stroke: 98.0 mm x 90.5 mm Compression Ratio: 10.7:1 Performance Horsepower: 382 hp @ 6000 rpm Torque: 391 lb-ft @ 2800-4800 rpm Fuel System Fuel Delivery: Sequential Multi-Point Fuel Injection (MPI) Fuel Type: Premium Unleaded (91 octane or higher recommended) Emission Control: Catalytic converters, OBD-II 🔧 Transmission Standard Transmission Type: 7-Speed Automatic Transmission Code: 722.9 (7G-TRONIC PLUS) Drive Layout: All-Wheel Drive (4MATIC) Features Shifting Modes: Comfort (C), Sport (S), Manual (M) Transmission Fluid Type: MB Specification 236.14 (e.g., Mobil ATF 134, Pentosin ATF1) Fluid Capacity Approx: 9 Liters (dry fill) 📐 Dimensions Exterior Length: 206.5 inches Width: 73.7 inches Height: 57.7 inches Wheelbase: 124.6 inches Weights Curb Weight Approx: 4550 - 4650 lbs Gross Vehicle Weight Rating Gvwr: 6283 lbs Cargo Trunk Volume Approx: 16.0 cu ft 🛡️ Safety Features Ratings NHTSA Front Impact: 5-Star (for comparable models of the era) IIHS Side Impact: Good (for comparable models of the era) Active Features Stability Control: Electronic Stability Program (ESP) Traction Control: ASR (Acceleration Slip Regulation) Braking Systems: Anti-lock Braking System (ABS), Brake Assist (BAS) Driver Assistance Package: PRE-SAFE® anticipatory safety system Passive Features Airbags: Dual front, front side, rear side, curtain airbags Seatbelts: Three-point inertia-reel with pretensioners and force limiters Head Restraints: Active NECK-PRO head restraints (front seats) 💡 Technology Features Infotainment System Name: COMAND APS (Cockpit Management and Navigation) Display Size: 7-inch color LCD Features: Navigation, AM/FM/Weatherband radio, CD/DVD player, MP3 compatibility, auxiliary audio input. Driver Assistance Adaptive Cruise Control: DISTRONIC PLUS (optional), maintains set distance from vehicle ahead. Parking Assistance: PARKTRONIC parking sensors (front and rear) Visibility Aids: Bi-Xenon Adaptive Headlights, Rain-sensing wipers, Auto-dimming mirrors. Connectivity Phone Integration: Bluetooth® hands-free calling (may require adapter module depending on phone compatibility) 🔧 Maintenance Service Intervals Oil Change Interval: Up to 10,000 miles or 1 year, depending on driving conditions (refer to manual) Major Service A: Typically around 10,000 miles (check fluids, filters, tire rotation) Major Service B: Typically around 20,000 miles (includes items from Service A plus brake fluid service, etc.) Transmission Fluid Service: Recommended every 40,000 - 60,000 miles, or as per dealer recommendation. Fluid Specifications Engine Oil Spec: MB Specification 229.5 (e.g., Mobil 1 0W-40 Synthetic) Engine Oil Capacity: 8.5 Liters (approx.) Coolant Spec: MB Specification 325.0 (e.g., Pentofrost G12 or equivalent) Brake Fluid Spec: DOT 4 Plus (MB Specification 331.0) Known Issues Common Wear Items: Air suspension components (struts, compressor), ignition coils, spark plugs. Infotainment Glitches: COMAND system occasional freezes or unresponsiveness. Oil Leaks: Valve cover gaskets, oil cooler seals can degrade over time. Maintenance Manual Reference Clarification: This owner's manual does not replace a service or repair manual...