🏷️ Basic Information Identification Make: Mercedes-Benz Model: S-Class S550 4MATIC Year: 2009 Generation Chassis Code: W221 👋 Introduction Market Position Segment: Full-size Luxury Sedan Competitive Analysis Competitors: BMW 7 Series, Audi A8, Lexus LS, Porsche Panamera (early models). Key Features Features: Advanced comfort features, powerful V8 engine, 4MATIC all-wheel drive, extensive safety systems, sophisticated interior. 📋 Manual Details Coverage Areas Primary Regions: USA Page Count Estimated Page Count: Varies by factory publication, typically 300-500 pages for full owner's manual. Manual Type Type: Owner's Manual Language Language: English Format Format: Digital PDF 📖 Manual Coverage Systems Covered Powertrain: Engine operation, lubrication, cooling, fuel system, emissions control. Chassis: Suspension, steering, brakes, wheels, tires, driveline (4MATIC). Electrical: Lighting system, instrument cluster, batteries, fuses, basic electrical component identification. Comfort And Convenience: Climate control, power seats, locks, windows, mirrors, sunroof, interior lighting. Infotainment: COMAND infotainment system operation, audio, navigation (basic operation), Bluetooth. Safety And Security: Airbags, seat belts, child restraint systems (ISOFIX/LATCH), anti-theft alarm, keyless-go operation. Procedures Included Maintenance: Recommended service intervals, fluid level checks, tire pressure checks, basic cleaning procedures. Operation: Vehicle start/stop, gear selection, parking brake operation, cruise control, wiper/headlight operation. Troubleshooting: Warning lamp identification and basic actions, fuse identification for common issues, safe roadside practices. Technical Depth Depth: Covers owner-level operation, maintenance, and basic troubleshooting. Does not include diagnostic codes or detailed repair procedures found in a service manual. 📊 Manual Specifications File Format File Type: PDF Searchable: Likely searchable text, dependent on the OCR quality of the original scan. Print Quality Quality: Dependent on source scan; factory manuals are typically high quality. Binding Type Binding: N/A (Digital Format) Paper Type Paper: N/A (Digital Format) ⚙️ Engine Specifications Primary Engine Engine Type: V8, naturally aspirated Engine Code: M273 Displacement: 5.5 Liters (5461 cc) Performance Horsepower: 382 hp @ 6000 rpm Torque: 391 lb-ft @ 2800-4800 rpm Fuel System Induction: Electronic Fuel Injection (EFI) Fuel Type: Premium Unleaded Gasoline (91 octane or higher recommended) Maintenance Oil Type: Mobil 1 Synthetic (or equivalent) - SAE 0W-40 Oil Capacity: Approx. 8.5 US Quarts (8.0 Liters) with filter change Air Filter Part Number: A2730900001 (or equivalent) 🔧 Transmission Standard Transmission Type: 7-speed automatic with Tiptronic and shift paddles Transmission Code: 7G-TRONIC Features Drive Modes: Comfort (C) and Sport (S) modes Maintenance Transmission Fluid Type: MB 236.14 (e.g., Pentosin ATF134, Febi Bilstein ATF 236.14) Transmission Fluid Capacity: Approx. 9.5 US Quarts (9.0 Liters) for complete drain and fill. 📐 Dimensions Exterior Length: 200.0 inches (5080 mm) Width: 73.7 inches (1872 mm) Height: 58.3 inches (1481 mm) Wheelbase: 116.7 inches (2965 mm) Weights Curb Weight: Approx. 4500 - 4700 lbs (2041 - 2132 kg) Gross Vehicle Weight Rating: Approx. 6000 lbs (2722 kg) 🛡️ Safety Features Ratings NHTSA Front Crash Test: 5-Star (for models tested) IIHS Front Crash Test: Good (for models tested) Active Features ABS: Standard Anti-lock Braking System (ABS) Esp: Standard Electronic Stability Program (ESP) Traction Control: Standard Traction Control System (TCS) Driver Assistance: Available DISTRONIC PLUS (adaptive cruise control), PARKTRONIC (parking assist), Lane Keeping Assist, Blind Spot Assist. Passive Features Airbags: Front, front-side, rear-side, curtain airbags. Active head restraints. Seat Belts: Pre-tensioning seat belts with force limiters, rear seat belt reminders. Child Restraints: ISOFIX/LATCH compatible rear seating positions. 💡 Technology Features Infotainment System Name: COMAND APS (Cockpit Management and Navigation) Features: 6.5-inch color display, CD/DVD changer, HDD for music storage, SD card slot, Bluetooth connectivity, navigation system, voice control (Linguatronic). Driver Assistance Standard: PARKTRONIC parking assist, cruise control. Optional: DISTRONIC PLUS (adaptive cruise control with radar), Lane Keeping Assist, Blind Spot Assist, Night View Assist. Connectivity Bluetooth: Bluetooth for hands-free calling and audio streaming. Comfort Features Seats: Multi-contour power front seats with memory, heating, and ventilation. Heated rear seats. Climate Control: THERMOTRONIC multi-zone automatic climate control. 🔧 Maintenance Service Intervals Major Service A: Typically every 10,000 miles or 12 months (indicated by 'Service A' on the display). Includes oil and filter change, fluid level checks, tire rotation. Major Service B: Typically every 20,000 miles or 24 months (indicated by 'Service B' on the display). Includes Service A items plus cabin filter replacement, brake inspection, comprehensive system checks. Transmission Service: Recommended every 40,000-60,000 miles for drain and refill, or as indicated by vehicle's flexible service schedule. Fluid Specifications Coolant: Mercedes-Benz specification 325.0 or 326.0 (Antifreeze/Coolant) Brake Fluid: DOT 4 Plus (or equivalent low-moisture DOT 4) Power Steering Fluid: MB specification 236.3 (Hydraulic Fluid) Known Issues Common Wear Items: Coil packs, spark plugs, accessory belts, front control arm bushings, air suspension components (if equipped - though S550 4MATIC often has conventional suspension), various sensors, O2 sensors, CAN bus communication glitches (requiring diagnostic tools). Infotainment Glitches: COMAND system occasional unresponsiveness or restarts. 📚 Vehicle History Brand Heritage Heritage: Mercedes-Benz has a long-standing reputation for luxury, engineering excellence, and safety dating back to the early 20th century. Model Evolution...