🏷️ Basic Information Identification Make: BMW Model: 3 Series (E90/E91/E92/E93) Sub Models Covered: 325i, 325xi, 330i, 330xi Chassis Codes: E90 (Sedan), E91 (Wagon/Touring), E92 (Coupe), E93 (Convertible) Production Years Covered: 2006, 2007, 2008, 2009, 2010 Codes Engine Codes: N51 (Valvetronic), N52 👋 Introduction Market Position Segment: Compact Executive Sedan/Coupe/Convertible/Wagon Brand Philosophy: Ultimate Driving Machine – focus on performance, handling, and driver engagement. Competitive Analysis Key Competitors: Audi A4, Mercedes-Benz C-Class, Lexus IS, Infiniti G35/G37, Cadillac CTS. Distinguishing Factors: Rear-wheel drive bias (even on xi models), sophisticated chassis tuning, direct steering feel, premium interior materials, advanced engine technology (Valvetronic). Key Features Platform: E90/E91/E92/E93, representing a significant evolution in BMW's compact executive platform. Powertrains: Inline-6 engines known for smooth power delivery and distinct BMW sound. Drivetrain Options: Available in rear-wheel drive (i) and all-wheel drive (xi) configurations. 📋 Manual Details Coverage Areas Manual Type: Complete Workshop Service Repair Manual Language: English Format: Downloadable PDF Page Count: Extensive, detailed (estimated 3000+ pages based on typical BMW workshop manuals for this era) Manual Completeness: Comprehensive, covering all aspects of repair and maintenance 📖 Manual Coverage Systems Covered Engine: N51/N52 engine diagnosis, repair, rebuild, component replacement, cooling system, lubrication system, fuel system, ignition system, emissions control. Transmission: Automatic and manual transmission service, repair, fluid replacement, clutch service (manual), torque converter service (automatic), electronic control unit (TCU). Drivetrain: All-wheel drive (xi models) system diagnosis and repair, differential service, driveshaft and CV joint replacement, axle shaft replacement. Suspension: Front and rear suspension component inspection, replacement (control arms, ball joints, bushings, shocks/struts), wheel alignment procedures, steering system service. Brakes: Hydraulic brake system diagnosis, repair, pad and rotor replacement, caliper service, brake fluid flush and bleeding, ABS/DSC system troubleshooting and component replacement. Electrical: Comprehensive wiring diagrams for all systems, starter, alternator, battery service, lighting system, power windows, power locks, heated seats, headlamp leveling, fuse box layouts, relay functions. Body: Body panel alignment, door and trunk operation, interior trim removal and installation, glass replacement, convertible top mechanism (E93), rust prevention and repair. HVAC: Air conditioning system diagnosis and repair, refrigerant handling, blower motor, evaporator, condenser, climate control module service, cabin air filter replacement. Safety Systems: Airbag system diagnosis, SRS module, seat belt pre-tensioners, parking sensors, tire pressure monitoring system (TPMS). Diagnostics: OBD-II troubleshooting, diagnostic trouble codes (DTCs), fault finding strategies, use of BMW diagnostic tools (e.g., ISTA/D). Procedures Included Routine Maintenance: Oil and filter changes, air filter replacement, spark plug replacement, cabin air filter replacement, brake fluid flush, coolant flush. Troubleshooting: Step-by-step diagnostic procedures for common and uncommon faults across all vehicle systems. Repair Procedures: Detailed, illustrated instructions for component removal, installation, and adjustment for virtually every part of the vehicle. Rebuilding Procedures: Engine and transmission overhaul procedures with specifications for critical wear tolerances. Diagnostic Tool Usage: Guidance on using diagnostic scanners and specific BMW service tools. Technical Depth Depth: Expert level, suitable for professional mechanics and advanced DIY enthusiasts. Includes torque specifications, clearances, electrical schematics, and diagnostic flowcharts. 📊 Manual Specifications File Format File Type: PDF Searchability: Searchable text for quick information retrieval. Print Quality: High resolution, suitable for printing individual sections or the entire manual. Binding Type Binding For Print: N/A (Downloadable PDF) Paper Type Paper For Print: N/A (Downloadable PDF) ⚙️ Engine Specifications Primary Engine Engine Name: N51 (US market specific, SULEV compliant, Valvetronic) Engine Name Alternative: N52 (Standard version) Engine Type: Naturally Aspirated Inline 6-Cylinder Displacement 325: 3.0 Liters (2996 cc) Displacement 330: 3.0 Liters (2996 cc) - although often marketed with slight variations, the core engine is the same 3.0L N52/N51 block, with tuning and component differences. Performance Horsepower 325: Approximately 215-218 hp (varies slightly by year and market) Torque 325: Approximately 200-215 lb-ft (varies slightly by year and market) Horsepower 330: Approximately 255-260 hp (varies slightly by year and market) Torque 330: Approximately 220-230 lb-ft (varies slightly by year and market) Fuel System Fuel Delivery: Electronic Fuel Injection (EFI) with direct injection in some later N51/N52 variants, but typically port injection for this specific model range. Valvetronic variable valve lift system. Fuel Type: Premium Unleaded Gasoline (91 octane or higher recommended) Emission Standard: N51 engine is SULEV (Super Ultra Low Emission Vehicle) compliant in relevant markets. 🔧 Transmission Standard Transmission Type Standard: 6-speed Manual Transmission (Getrag GS6-37BZ/DZ) Optional Transmission Type Optional: 6-speed Automatic Transmission (ZF 6HP19/6HP26 with Steptronic) Features Transmission Features: Steptronic manual shifting mode on automatic transmission, sport mode selection, electronic transmission control unit (TCU). Fluid Specifications Automatic Transmission Fluid: BMW LT-3 (P/N 83 22 0 142 516) or equivalent specialist fluid (e.g., Pentosin ATF1). Manual Transmission Fluid: BMW MTF LT-2 (P/N 83 22 0 309 031) or equivalent specialist fluid (e.g., Pentosin MTF 2). 📐 Dimensions Exterior Wheelbase E90: 115.0 inches (2920 mm) Wheelbase E91: 108.7 inches (2760 mm) Wheelbase E92 E93: 108.7 inches (2760 mm) Length E90: 181.2 inches (4603 mm)...