🏷️ Basic Information Identification Make: Audi Model: A6 S6 RS6 Model Code: 4B (including 4B2, 4B4, 4B5, 4B6, 4BH) Year: 2003 👋 Introduction Market Position Market Position: Premium mid-size luxury sedan and performance variants, positioned against competitors like BMW 5 Series, Mercedes-Benz E-Class, and Jaguar XJ. Competitive Analysis Competitive Analysis: The Audi A6 (C5 platform) in 2003 represented a strong contender in the executive luxury segment, offering advanced Quattro all-wheel-drive, refined interiors, and sophisticated styling. The S6 variant provided enhanced performance, while the RS6 was a high-performance homologation special, known for its potent twin-turbo V8 engine and aggressive styling. Key Features Key Features: Quattro all-wheel-drive system, advanced MMI infotainment interface (later iterations), high-quality interior materials, robust build quality, and potent engine options ranging from efficient V6 to high-output V8 performance variants. 📋 Manual Details Coverage Coverage Areas: All models and variants of the Audi A6, S6, and RS6 produced for the 2003 model year, across all internal chassis designations (4B, 4B2, 4B4, 4B5, 4B6, 4BH). Page Count Page Count: 16401 Manual Type Manual Type: Factory Service and Repair Manual Language Language: English Format Format: PDF 📖 Manual Coverage Systems Systems Covered: General Information, Accessories & Equipment, Audio/Visual/Telematics, Brakes, Driveline Axle, Electrical Systems, Lighting, Restraint Systems, Steering, Suspension, Body & Frame (Interior & Exterior), Mechanical Engine, Transmission, Tires & Wheels, HVAC, Wiring Diagrams, and significantly more. Procedures Procedures Included: Comprehensive diagnostic procedures, step-by-step repair instructions, maintenance schedules, troubleshooting guides, replacement and adjustment procedures for all major vehicle systems and components. Technical Depth Technical Depth: Extremely high technical depth, covering everything from routine maintenance and basic repairs to advanced diagnostics, component overhauls, and complete system rebuilds. Includes detailed schematics and specifications. 📊 Manual Specifications File Details File Format: PDF Searchability: Fully searchable text Compatibility: Compatible with all Windows and Mac operating systems. Software Requirements: Adobe PDF Reader and/or WinRar. Physical Attributes Print Quality: High-resolution, suitable for professional printing of individual pages or the entire manual. Binding Type: Digital (PDF) - Printable Paper Type: N/A (Digital Format) ⚙️ Engine Specifications A6 Variants Primary Engine A6: 2.8L V6 (AAH, ACK, ALG, AMX, APR, AQD) / 3.7L V8 (BFL) Performance A6: 190-260 hp depending on engine variant. S6 Variant Primary Engine S6: 4.2L V8 (AQJ, ARU) Performance S6: 340 hp @ 6600 rpm; 317 lb-ft @ 3400 rpm Rs6 Variant Primary Engine Rs6: 4.2L V8 Twin-Turbocharged (BCY) Performance Rs6: 450 hp @ 6000 rpm; 414 lb-ft @ 1950 rpm Fuel System Fuel System: Multi-Point Fuel Injection (MPI) Engine Management Engine Management: Bosch Motronic ECU (specific variant dependent) 🔧 Transmission A6 S6 Standard Transmission A6 S6: 5-speed Tiptronic Automatic Transmission (01V) Optional Transmission A6 S6: 6-speed Manual Transmission (GGU, FXX) for certain A6 models Rs6 Standard Transmission Rs6: 5-speed Tiptronic Automatic Transmission (01X) Features Transmission Features: Tiptronic automatic shifting for manual control, permanent Quattro all-wheel-drive system with Torsen center differential. Fluid Specifications Automatic Transmission Fluid: G 052 162 A2 (Audi Synthetic ATF) Manual Transmission Fluid: G 052 171 A2 (Audi Manual Gear Oil) 📐 Dimensions Exterior Wheelbase: 2832 mm (111.5 in) Length: 4813 mm (189.5 in) for A6/S6, 4846 mm (190.8 in) for RS6 Width: 1785 mm (70.3 in) for A6/S6, 1807 mm (71.1 in) for RS6 Height: 1474 mm (58.0 in) for A6/S6, 1420 mm (55.9 in) for RS6 Weights Curb Weight: 1600-1750 kg (3527-3858 lbs) for A6, 1820 kg (4012 lbs) for S6, 1865 kg (4112 lbs) for RS6 Wheels Tires Wheel Bolt Pattern: 5x112 mm Typical Tire Sizes: 215/55 R16, 225/55 R16, 235/45 R17, 255/40 R18 (RS6 specific) 🛡️ Safety Features Ratings NHTSA Front Impact Rating: Not explicitly stated for 2003 model year, but generally considered good for the era. IIHS Side Impact Rating: Not explicitly stated for 2003 model year, but generally considered good for the era. Passive Features Passive Safety Features: Front airbags, side airbags, optional front and rear head curtain airbags, ABS with EBD, traction control (ASR). Active Features Active Safety Features: Electronic Stability Program (ESP/ASR), Anti-lock Braking System (ABS), Electronic Brake-force Distribution (EBD), Quattro all-wheel-drive. 💡 Technology Features Infotainment Infotainment System: Audi Chorus or Symphony audio systems, with optional Navigation system and early forms of Audi's Multi Media Interface (MMI). Driver Assistance Driver Assistance Features: Cruise control, parking sensors (optional), rain-sensing wipers. Connectivity Connectivity Features: Optional Bluetooth preparation (via aftermarket modules or specific OEM kits), CD changer compatibility. 🔧 Maintenance Service Intervals Oil Change Interval: Every 7,500 miles or 12 months (synthetic oil recommended) Timing Belt Replacement: Every 105,000 miles or 7 years (for 30-valve 2.8L V6 and 4.2L V8 engines; belt-driven camshafts). Check specific engine for chain-driven variants. Spark Plug Replacement: Every 100,000 miles (for iridium spark plugs) Fluid Specifications Engine Oil Specification: SAE 5W-40 or 5W-30 Synthetic Engine Oil, meeting VW 502 00 / 505 00 standards. Coolant Specification: G 12 Plus (Pink) or G 12 EVO...