🏷️ Basic Information Identification Make: BMW Model: 328xi Model Code: E90/E91 (Sedan/Wagon) Chassis Code: E90 (Sedan), E91 (Wagon) Generation: E90/E91 Production Years Covered: 2006, 2007, 2008, 2009, 2010 Codes Engine Code: N51B30 (Valvetronic, US specific SULEV variant) Drivetrain Code: xi (xDrive all-wheel drive) 👋 Introduction Market Position Segment: Compact Executive Sedan/Wagon Target Audience: Enthusiasts, independent repair shops, and discerning BMW owners seeking to perform their own maintenance and repairs. Competitive Analysis Key Competitors: Audi A4 Quattro, Mercedes-Benz C-Class 4MATIC, Lexus IS250 AWD, Infiniti G35x Key Features Vehicle Highlights: Balanced chassis, refined interior, powerful inline-6 engine, xDrive all-wheel drive for enhanced traction. Manual Value Proposition: Provides the same level of detail and accuracy as the official BMW service documentation, enabling DIY repairs and informed maintenance. 📋 Manual Details Coverage Areas Coverage Continents: North America (US Market focus due to SULEV engine) Body Styles: Sedan (E90), Wagon/Sports Wagon (E91) Page Count Estimated Pages: 1000+ Manual Type Type: Factory Service Manual / Repair Manual Language Language: English Format Format: PDF Download 📖 Manual Coverage Systems Covered Powertrain: Engine (N51B30), Fuel System, Ignition System, Exhaust System, Cooling System, Lubrication System Drivetrain: xDrive All-Wheel Drive System (transfer case, differentials, drive shafts) Transmission: Automatic Transmission (e.g., GA6HP19Z), Manual Transmission (less common on xi models, but likely covered) Chassis: Suspension (Front & Rear), Steering System, Braking System (including ABS, DSC) Electrical: Engine Control Unit (ECU), Body Control Module (BCM), Lighting, Power Accessories, Diagnostic Trouble Codes (DTCs) Comfort Systems: Climate Control (HVAC), Seats, Doors, Windows, Sunroof, Locks Safety Systems Safety: Airbags, Seatbelts, Traction Control (DSC), Stability Control (DSC) Bodywork Body And Interior: Body Panels, Bumpers, Interior Trim, Upholstery Procedures Included Maintenance: Routine Service, Oil Changes, Filter Replacements, Fluid Checks and Changes Repair And Overhaul: Engine Component Replacement (pistons, valves, gaskets), Transmission Rebuild, Suspension Component Repair, Brake Component Service Diagnostics And Troubleshooting: Symptom-based troubleshooting, Electrical system diagnostics, OBD-II diagnostics, component testing Electrical System Repair: Wiring Diagrams, Component Testing, Sensor Replacement, Module Programming (potentially) Special Tools And Techniques: Identification of BMW-specific tools and procedures for various repairs. Technical Depth Depth: Comprehensive: From basic maintenance to full engine and transmission overhauls, including electrical diagnostics and bodywork. 📊 Manual Specifications File Format File Type: PDF Print Quality Print Readability: High Resolution, suitable for printing individual pages or the entire manual. Binding Type Binding Method: N/A (Digital PDF - Print at your discretion) Paper Type Paper Recommendation: Standard printer paper for home printing. ⚙️ Engine Specifications Primary Engine Engine Family: N51/N52 (Naturally Aspirated Inline-6) Engine Type: Inline-6 Cylinder, Naturally Aspirated Displacement: 2.996 cc (3.0 Liters) Bore X Stroke: 85.0 mm x 88.0 mm Compression Ratio: 12.0:1 Valvetrain: Double Overhead Camshafts (DOHC), 4 valves per cylinder, VANOS (Variable Valve Timing), Valvetronic Performance Horsepower: 230 hp @ 6500 rpm Torque: 200 lb-ft @ 2750 rpm Fuel System Fuel Delivery: Sequential Multi-Point Fuel Injection (MPI) Fuel Type: Premium Unleaded Gasoline (91 AKI or higher recommended for optimal performance) Emission Standard: SULEV (Super Ultra Low Emission Vehicle) in California and CARB states (N51 engine) 🔧 Transmission Standard Type: 6-Speed Steptronic Automatic Transmission (GA6HP19Z) Optional Type: 6-Speed Manual Transmission (less common on AWD models) Features Automatic Features: Sequential shift mode, Sport mode, Adaptive Shift Control (ASC) AWD System: BMW xDrive: Electronically controlled, full-time all-wheel drive with variable torque distribution. 📐 Dimensions Exterior Wheelbase: 108.7 inches (2760 mm) Length: 181.4 inches (4608 mm) Width: 70.1 inches (1781 mm) Height: 57.0 inches (1448 mm) Front Track: 59.5 inches (1511 mm) Rear Track: 60.3 inches (1532 mm) Weights Curb Weight: Approx. 3600-3750 lbs (1633-1701 kg) depending on options Gross Vehicle Weight Rating: Approx. 4740 lbs (2150 kg) Cargo Trunk Volume: 12.0 cu ft (337 L) for Sedan Wagon Cargo Volume: Approx. 20.0 cu ft (560 L) behind rear seats, expandable to 60.7 cu ft (1718 L) with rear seats folded for Wagon (E91) 🛡️ Safety Features Ratings NHTSA Front Crash Test: 5-Star (for driver and front passenger) IIHS Side Impact Test: Good IIHS Roof Strength: Good Active Features Traction Control: Dynamic Traction Control (DTC) and Dynamic Stability Control (DSC) Braking System: Anti-lock Braking System (ABS), Electronic Brake-force Distribution (EBD), Brake Assist Passive Features Airbags: Front airbags, front side-impact airbags, front and rear head protection airbags (curtain airbags) Seatbelts: Three-point inertia-reel seatbelts with pre-tensioners and force limiters Child Safety: LATCH (Lower Anchors and Tethers for Children) system, Child safety rear door locks 💡 Technology Features Infotainment Head Unit Options: BMW Professional Radio, optional iDrive system with a central control knob and display. Connectivity: Optional Bluetooth hands-free interface, USB audio interface (later production years). Driver Assistance Cruise Control: Standard cruise control, optional Adaptive Cruise Control (ACC) on some models. Parking Assistance: Optional Rear Park Distance Control (PDC). Lighting Headlight Options: Standard Halogen, optional Xenon Adaptive Headlights. 🔧 Maintenance Service Intervals Oil Change Interval: Variable, typically 10,000-15,000 miles or 12-24 months, based on Condition...