Segment:
Full-Size Luxury Sedan
Competitors:
BMW 7 Series, Audi A8, Lexus LS, Porsche Panamera
Advantages:
Advanced technology, ride comfort, build quality, strong brand heritage.
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.
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
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
Depth:
Comprehensive: Covers basic maintenance to full engine and transmission rebuilds, including advanced electrical diagnostics.
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)
Horsepower:
268 hp @ 6000 rpm
Torque:
258 lb-ft @ 3500 rpm
Induction:
Electronic Fuel Injection (EFI)
Fuel Type:
Premium Unleaded Gasoline (91+ octane recommended)
Fuel Capacity:
80 Liters (21.1 US Gallons)
ECU Type:
ME 2.8 (Engine Control Unit)
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
Drivetrain Options:
4MATIC All-Wheel Drive
Modes:
Comfort (C) and Sport (S) modes
Fluid Specification:
MB Specification 236.14 (e.g., Fuchs Titan ATF 4134, Mobil ATF 134)
NHTSA Front Crash Test:
5-Star (Driver), 5-Star (Passenger)
IIHS Top Safety Pick:
Yes
ABS:
Anti-lock Braking System
Esp:
Electronic Stability Program (ESP)
Bas:
Brake Assist System (BAS)
Pre Safe:
Mercedes-Benz PRE-SAFE® System
Airbags:
Front Airbags, Front Side Airbags, Curtain Airbags, Rear Side Airbags (Optional)
Seatbelts:
3-point Active Seatbelts with Belt Tensioners and Force Limiters
System Name:
COMAND (Cockpit Management and Navigation)
Features:
CD/DVD Player, Radio, Navigation System, Bluetooth Connectivity, Auxiliary Input.
Adaptive Cruise Control:
DISTRONIC (Optional)
Parking Assist:
PARKTRONIC Parking Assist System
Lane Keeping:
LANE KEEPING ASSIST (Optional)
Blind Spot:
BLIND SPOT ASSIST (Optional)
Connectivity Features:
Bluetooth for hands-free calling and audio streaming.
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).
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)
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).
Heritage:
Mercedes-Benz has a long-standing reputation for luxury, engineering excellence, and automotive innovation dating back to the late 19th century.
Chassis Generation:
W221 is the fourth generation of the S-Class, succeeding the W220. Introduced in 2005, it featured a completely new design and significant technological advancements.
Production Period:
2005-2013 (W221 Generation)
Manufacturing Locations:
Sindelfingen, Germany; Beijing, China (for Chinese market)
