🏷️ Basic Information Identification Make: Audi Model: S6 Chassis Code: C5 Model Year: 2003 👋 Introduction Market Position Positioning: High-performance luxury sedan, direct competitor to BMW M5 and Mercedes-AMG E-Class of its era. Competitive Analysis Competitors: BMW M5 (E39), Mercedes-Benz E55 AMG (W210). Key Features Powertrain: Naturally aspirated 4.2L V8 engine, Quattro all-wheel drive. Performance Focus: Emphasis on refined performance, sophisticated handling, and luxurious comfort. Value Proposition Owner Benefit: Empowers owners to perform maintenance and repairs, saving costs and increasing understanding. Manual Credibility Origin: Written by manufacturers, mirrors dealership technician resources. 📋 Manual Details Coverage Areas Manual Type: Service Repair Workshop Manual Language: English Format: PDF Software Requirements: Adobe PDF Reader Operating System Compatibility: Windows & Mac Printability: Yes, all pages printable 📖 Manual Coverage Systems Covered Engine Mechanical: Complete engine overhaul, internal components, timing, lubrication, cooling. Engine Electrical: Ignition system, starter, alternator, sensors, ECU diagnosis. Emission Control: Catalytic converter, EVAP system, oxygen sensors, emissions testing procedures. Fuel System: Fuel pump, injectors, fuel filter, fuel pressure regulation, fuel lines. Clutch System: Clutch operation, hydraulic system, clutch disc, pressure plate, release bearing. Manual Transaxle: Gearbox removal, overhaul, synchronizers, shift mechanism, fluid specifications. Automatic Transaxle: Transmission diagnosis, control module, hydraulic system, torque converter, fluid change procedures. Driveshaft Axles: CV joints, driveshafts, differential service, wheel bearings. Suspension System: Front and rear suspension components, shock absorbers, springs, control arms, alignment procedures. Steering System: Power steering pump, steering rack, tie rods, steering column, alignment. Restraint System: Airbag system, seat belts, SRS warning light diagnosis. Brake System: ABS system, brake calipers, rotors, pads, brake fluid, bleeding procedures. Body Interior Exterior: Body panels, doors, windows, upholstery, trim, glass replacement. Body Electrical: Lighting, power accessories, central locking, interior electronics, wiring schematics. HVAC: Air conditioning, heating, ventilation, climate control module, refrigerant service. Procedures Included Maintenance: Scheduled maintenance, oil changes, filter replacements, spark plug changes, fluid checks. Troubleshooting: Diagnostic flowcharts, common fault diagnosis, symptom-based troubleshooting. Repair: Step-by-step repair instructions for all covered systems. Diagnostics: Component testing, fault code interpretation, use of diagnostic tools. Wiring Schematics: Detailed electrical wiring diagrams for all vehicle systems. Specifications: Torque values, clearances, fluid capacities, performance data. Technical Depth Depth: Comprehensive, suitable for basic DIY to professional dealership-level repairs. Illustrations: Abundant diagrams and illustrations for clarity. Target Audience: Audi owners with basic mechanical skills, independent mechanics, dealership technicians. 📊 Manual Specifications File Format File Type: PDF Searchability: Likely text-searchable within PDF reader. Download Speed: Fast download Print Quality Print Resolution: High quality, suitable for printing. Binding Type Binding: Not applicable (digital format). Paper Type Paper Quality: Not applicable (digital format, printable on demand). ⚙️ Engine Specifications Primary Engine Engine Code: AQJ (or similar variants like AZA) Engine Type: 4.2L V8 DOHC 32-valve Performance Horsepower: 340 PS (335 bhp / 250 kW) at 6500 rpm Torque: 430 Nm (317 lb-ft) at 3400 rpm Fuel System Fuel Delivery: Multi-point Fuel Injection (MPI) Fuel Type: Unleaded Premium Gasoline (91 octane or higher recommended) Cooling System Coolant Type: G12 or G12+ (Pink/Red coolant) Lubrication Oil Type: SAE 0W-40 or 5W-40, API SJ/SL, ACEA A3-98/B3-98 or newer Oil Capacity Oil Capacity With Filter: Approx. 8.0 Liters (8.5 US Quarts) 🔧 Transmission Standard Transmission Type: 6-speed Manual Transaxle Optional Transmission Type Optional: 5-speed Tiptronic Automatic Transaxle Features Drivetrain: Quattro permanent all-wheel drive system Fluid Specs Manual Manual Gearbox Oil: API GL-4 or GL-5, SAE 75W-90 synthetic Fluid Specs Auto Automatic Transmission Fluid: G 052 162 (or equivalent ATF conforming to VW Specification 521 62) 📐 Dimensions Exterior Length: 4815 mm (189.6 in) Width: 1810 mm (71.3 in) Height: 1427 mm (56.2 in) Wheelbase: 2760 mm (108.7 in) Weights Curb Weight Manual: Approx. 1770 kg (3902 lbs) Curb Weight Auto: Approx. 1790 kg (3946 lbs) Gross Vehicle Weight Rating: Approx. 2290 kg (5048 lbs) Cargo Trunk Volume: Approx. 510 Liters (18.0 cu ft) 🛡️ Safety Features Ratings NHTSA Frontal Crash Rating: Not explicitly rated for 2003 model year by NHTSA in easily accessible public records, but typically good for its class. Active Features ABS: Standard Anti-lock Braking System (ABS) Traction Control: Standard Electronic Stability Program (ESP) / Traction Control System (ASR) Passive Features Airbags: Driver and front passenger airbags, front side airbags. Seat Belts: 3-point inertia-reel seatbelts with pre-tensioners and force limiters. 💡 Technology Features Infotainment Audio System: Bose premium sound system was often an option. Navigation: Optional factory navigation system available. Driver Assistance Parking Sensors: Optional front and rear parking sensors. Cruise Control: Standard cruise control. Connectivity Phone Integration: Optional Bluetooth hands-free system may have been available. 🔧 Maintenance Service Intervals Oil Change Interval: Typically every 10,000 miles (16,000 km) or 12 months, whichever comes first, using synthetic oil. Spark Plug Replacement: Refer to manual, typically around 60,000-100,000 miles (96,000-160,000 km) depending on plug type. Timing Belt Replacement: The 4.2L V8 in the C5 S6 uses a timing *chain*, not a belt,...