🏷️ Basic Information Identification Make: Mercedes-Benz Model: S550 Year: 2008 Chassis Code: W221 Codes Engine Code: M273.961 Transmission Code: 722.903 (7G-TRONIC PLUS) 👋 Introduction Market Position Luxury Segment: Flagship luxury sedan, competing with BMW 7 Series, Audi A8, Lexus LS, Porsche Panamera Competitive Analysis Differentiation: Known for advanced technology, ride comfort, prestigious brand image, and sophisticated engineering Key Features Vehicle Comfort And Convenience: AIRMATIC semi-active air suspension, multi-contour seats, COMAND infotainment system, ambient lighting Key Features Manual Software Advantages: Searchable, easily updated, accessible across multiple devices (depending on licensing), avoids physical wear and tear 📋 Manual Details Coverage Areas Coverage Scope: Comprehensive repair and service information Geographic Coverage: Global (North American and European specifications primarily) Page Count Estimated Page Count: 3000+ Manual Type Type: Official Service and Repair Manual Software Source: Licensed Mercedes-Benz official documentation Language Language: English Format Format: Software (likely a digital database or interactive PDF) 📖 Manual Coverage Systems Covered Powertrain: Engine mechanical, fuel, ignition, exhaust, cooling, lubrication, 7-speed automatic transmission (722.9) Chassis: Suspension (AIRMATIC), steering, brakes (ABS, ESP), wheels and tires Electrical: Body electrical systems, lighting, instrumentation, infotainment (COMAND), CAN bus diagnostics, gateway modules, sensors Body: Exterior body panels, interior trim, doors, windows, sunroof, convertible top (if applicable), crash structure Procedures Included Maintenance: Scheduled maintenance, fluid changes, filter replacements, inspection points Diagnostics: Troubleshooting guides, fault code interpretation (OBD-II and proprietary codes), wiring diagrams Repair: Component removal and installation, overhaul procedures, adjustments, recalibration Specifications: Torque specifications, alignment data, diagnostic parameters, component tolerances Technical Depth Depth: Full factory-level repair and diagnostic procedures, suitable for professional technicians and advanced DIY enthusiasts Diagnostic Tools Req: Requires Mercedes-Benz diagnostic tools (e.g., STAR Diagnosis/XENTRY) for advanced electronic diagnostics and module programming 📊 Manual Specifications File Format Digital Format Details: Interactive software, often with hyperlinked sections and search functionality Print Quality Visual Elements: High-resolution diagrams, schematics, photographs, and illustrations Binding Type Binding: N/A (Software) Paper Type Paper Quality: N/A (Software) ⚙️ Engine Specifications Primary Engine Engine Type: 4.7L V8 DOHC 32-valve Bore X Stroke: 92.9 mm x 86.0 mm Compression Ratio: 10.0:1 Performance Horsepower: 382 hp @ 6000 rpm Torque: 391 lb-ft @ 2800-4500 rpm Fuel System Fuel Delivery: Sequential Multi-Point Fuel Injection (SFI) Recommended Fuel: Premium Unleaded Gasoline (91 octane or higher) Emissions Control Emission Standard: LEV II (Low Emission Vehicle) 🔧 Transmission Standard Transmission Type: 7-speed automatic (7G-TRONIC) Gear Ratios: 4.375 / 2.857 / 1.925 / 1.367 / 1.000 / 0.821 / 0.728 (Reverse: 3.417) Fluid Type: MB Specification 236.14 (e.g., Mobil ATF 134, Pentosin ATF1) Features Selectable Modes: Comfort (C), Sport (S), Manual (M) 📐 Dimensions Exterior Length: 200.0 inches Width: 73.0 inches Height: 57.7 inches Wheelbase: 116.7 inches Weights Curb Weight: 4431 lbs Gross Vehicle Weight Rating: 5644 lbs Cargo Trunk Volume: 16.0 cu ft 🛡️ Safety Features Ratings NHTSA Front Crash Test: 5-Star (Driver), 5-Star (Passenger) IIHS Crash Test Rating: Good (Frontal Offset, Side Impact, Roof Strength - based on W221 platform in general) Active Features Stability Control: Electronic Stability Program (ESP) with Crosswind Assist Braking System: Anti-lock Braking System (ABS), Brake Assist (BAS), Electronic Brake-force Distribution (EBD) Driver Assistance Options: Distronic Plus (Adaptive Cruise Control), Lane Keeping Assist, Blind Spot Assist, PARKTRONIC (Parking Sensors) Passive Features Airbags: Dual-stage front airbags, front side airbags, front and rear side curtain airbags, front pelvic airbags Seatbelts: Pretensioners, load limiters, Active Head Restraints (NECK-PRO) 💡 Technology Features Infotainment Infotainment System: COMAND (Cockpit Management and Navigation Entertainment) APS with 7-inch color display Audio System: Harman Kardon LOGIC 7 surround sound system (optional premium) Connectivity Options: Bluetooth interface, optional Media Interface (for iPod, USB), SD card slot Driver Assistance Adaptive Cruise Control: Distronic Plus (DTR+) Lane Management: Lane Keeping Assist (LKA), Blind Spot Assist (BAS) Parking Assistance: PARKTRONIC (front and rear parking sensors) Lighting Headlights: Bi-Xenon Adaptive Headlights with LED Daytime Running Lights 🔧 Maintenance Service Intervals Oil Change Interval: Variable, typically based on 'Active Service System' (ASSYST PLUS) indicator, usually around 10,000-15,000 miles or 12 months. Major Service Points: Spark plugs (around 60,000 miles), transmission fluid and filter service (7G-TRONIC service interval typically 39,000 miles or as per ASSYST PLUS), brake fluid flush (every 2 years). Fluid Specifications Engine Oil Capacity: 8.5 liters (with filter) Engine Oil Specification: MB 229.5 (e.g., Mobil 1 0W-40, Castrol Syntec 0W-40) Coolant Type: MB Specification 325.0 (Glysantin G05 or equivalent) Brake Fluid Type: DOT 4 Plus (MB Specification 331.0) Known Issues Common Wear Items: AIRMATIC suspension components (struts, compressor, lines), ABC system (if applicable on some variants - not standard S550), ignition coils, spark plugs, battery drain issues, COMAND system glitches. Interior Quirks: Seat ventilation fan failures, door lock actuator issues, interior trim rattles. 📚 Vehicle History Brand Heritage Mercedes Benz Legacy: Long history of luxury, engineering innovation, and automotive safety leadership since the late 19th century. Model Evolution S Class Lineage: The S-Class is the...