🏷️ Basic Information Identification Make: Mercedes-Benz Model: S350 Model Code: W221 Year: 2006 Codes Engine Code: M272 (3.5L V6) Chassis Code: W221 👋 Introduction Market Position Segment: Full-Size Luxury Sedan Competitors: BMW 7 Series, Audi A8, Lexus LS, Porsche Panamera Competitive Analysis Advantages: Advanced technology, ride comfort, build quality, strong brand heritage. Key Features Feature 1: State-of-the-art driver assistance systems. Feature 2: Luxurious and spacious interior with premium materials. Feature 3: Advanced infotainment and connectivity options. 📋 Manual Details Coverage Areas Engine: 3.5L M272 V6 Transmission: 722.9 (7G-TRONIC) Drivetrain: RWD & AWD (4MATIC) Body: All Body Styles Electrical Systems: Full Coverage Suspension And Steering: Full Coverage Brakes: Full Coverage Climate Control: Full Coverage Safety Systems: Full Coverage (SRS, ABS, ESP) Page Count Estimated Pages: 3000+ Manual Type Type: Official Factory Service & Repair Manual Software Language Language: English Format Format: Software (Digital Download) 📖 Manual Coverage Systems Covered Powertrain: Engine, Fuel System, Exhaust System, Transmission, Drivetrain Components Chassis: Suspension (AirMatic, Active Body Control), Steering, Brakes (ABS, BAS, ESP), Wheels & Tires Electrical: ECU, Body Control Modules (BCM), Powertrain Control Modules (PCM), Lighting, Instrumentation, Infotainment, CAN Bus Architecture, Battery & Charging System Comfort And Convenience: Climate Control (Thermotronic), Seats, Doors, Windows, Sunroof, Locks, Power Features Safety And Restraints: Airbag System (SRS), Seat Belts, Pre-Safe System Procedures Included Maintenance: Scheduled Maintenance, Fluid Changes, Filter Replacements, Lubrication Repair: Engine Overhaul, Transmission Rebuild, Brake System Repair, Suspension Component Replacement, Electrical Component Diagnosis & Repair, Body Panel Repair Troubleshooting: Diagnostic Trouble Codes (DTCs), Symptom-Based Diagnostics, Electrical Schematics for Diagnosis Diagnostics: Wiring Diagrams, Component Location Charts, Diagnostic Tool Usage (e.g., STAR DIAGNOSIS) Technical Specifications: Torque Specifications, Tolerances, Diagnostic Parameters, Component Specifications Technical Depth Depth: Comprehensive: Covers basic maintenance to full engine and transmission rebuilds, including advanced electrical diagnostics. 📊 Manual Specifications File Format Format: Digital Software, Searchable PDF Print Quality Quality: High Resolution Graphics and Diagrams Binding Type Binding: N/A (Software) Paper Type Paper: N/A (Software) ⚙️ Engine Specifications Primary Engine Engine Type: Naturally Aspirated V6 Displacement: 3.5 Liters (3498 cc) Bore X Stroke: 92.9 mm x 86.0 mm Compression Ratio: 10.7:1 Valve Train: DOHC, 4 valves per cylinder, Variable Valve Timing (VVT) Performance Horsepower: 268 hp @ 6000 rpm Torque: 258 lb-ft @ 3500 rpm Fuel System Induction: Electronic Fuel Injection (EFI) Fuel Type: Premium Unleaded Gasoline (91+ octane recommended) Fuel Capacity: 80 Liters (21.1 US Gallons) Engine Management ECU Type: ME 2.8 (Engine Control Unit) 🔧 Transmission Standard Type: 7-Speed Automatic (7G-TRONIC) Gear Ratios: 1st: 4.377, 2nd: 2.858, 3rd: 1.920, 4th: 1.420, 5th: 1.000, 6th: 0.868, 7th: 0.775, Reverse: 3.415 Optional Drivetrain Options: 4MATIC All-Wheel Drive Features Modes: Comfort (C) and Sport (S) modes Fluid Type Fluid Specification: MB Specification 236.14 (e.g., Fuchs Titan ATF 4134, Mobil ATF 134) 📐 Dimensions Exterior Length: 5079 mm (199.9 inches) Width: 1871 mm (73.7 inches) Height: 1485 mm (58.5 inches) Wheelbase: 3081 mm (121.3 inches) Weights Curb Weight: 1835 kg (4045 lbs) Gross Vehicle Weight Rating: 2380 kg (5247 lbs) 🛡️ Safety Features Ratings NHTSA Front Crash Test: 5-Star (Driver), 5-Star (Passenger) IIHS Top Safety Pick: Yes Active Features ABS: Anti-lock Braking System Esp: Electronic Stability Program (ESP) Bas: Brake Assist System (BAS) Pre Safe: Mercedes-Benz PRE-SAFE® System Passive Features Airbags: Front Airbags, Front Side Airbags, Curtain Airbags, Rear Side Airbags (Optional) Seatbelts: 3-point Active Seatbelts with Belt Tensioners and Force Limiters 💡 Technology Features Infotainment System Name: COMAND (Cockpit Management and Navigation) Features: CD/DVD Player, Radio, Navigation System, Bluetooth Connectivity, Auxiliary Input. Driver Assistance Adaptive Cruise Control: DISTRONIC (Optional) Parking Assist: PARKTRONIC Parking Assist System Lane Keeping: LANE KEEPING ASSIST (Optional) Blind Spot: BLIND SPOT ASSIST (Optional) Connectivity Connectivity Features: Bluetooth for hands-free calling and audio streaming. 🔧 Maintenance Service Intervals Oil Change Interval: Every 10,000 miles or 12 months, whichever comes first (using synthetic oil). Major Service A: Typically at 10,000 miles or 1 year (inspect and replace filters, check fluids). Major Service B: Typically at 20,000 miles or 2 years (includes Service A plus brake fluid change, transmission fluid/filter service based on driving conditions). Fluid Specifications Engine Oil: SAE 0W-40 or 5W-40 Synthetic Oil, MB 229.5 or 229.51 Approved Coolant: MB Specification 325.0 (Antifreeze/Coolant, blue) Brake Fluid: DOT 4 Plus (MB Specification 331.0) Known Issues Common Issue 1: Coil pack and spark plug failure, leading to misfires. Common Issue 2: Oil leaks from the valve cover gaskets or oil cooler seals. Common Issue 3: Air suspension (AirMatic) compressor failure or air leakages from struts/lines. Common Issue 4: Transmission shifting issues or 'limp mode' due to valve body or conductor plate problems in the 7G-TRONIC. Common Issue 5: Sensors failing (e.g., camshaft position sensor, crankshaft position sensor). 📚 Vehicle History Brand Heritage Heritage: Mercedes-Benz has a long-standing reputation for luxury, engineering excellence, and automotive innovation dating back to the late 19th century. Model Evolution Chassis...