🏷️ Basic Information Identification Make: BMW Model: 135i Year: 2008 Codes Chassis Code: E82 (Coupe) Engine Code Primary: N54B30A 👋 Introduction Market Position Segment: Compact Premium Sport Coupe/Sedan (3 Series platform variant). Target Audience: Enthusiast drivers seeking performance and luxury in a compact package. Competitive Analysis Competitors: Audi A3, Mercedes-Benz C-Class Coupe, Infiniti G37 Coupe. Key Features Performance Focus: Emphasizes the twin-turbocharged N54 engine's power and torque. Driving Dynamics: Highlights BMW's renowned handling and RWD platform. Official Licensing: Officially licensed product, ensuring accuracy and completeness directly from BMW. 📋 Manual Details Coverage Areas Manual Type: Service and Repair Manual Language: English Format: Software (Digital) Page Count Estimated Page Count: Extensive digital content, equivalent to several thousand printed pages. 📖 Manual Coverage Systems Covered Engine Mechanical: Complete engine disassembly, inspection, and reassembly for N54B30 twin-turbo inline-6. Engine Management: Fuel injection, ignition system, electronic throttle control, turbocharger systems, diagnostic trouble codes (DTCs). Transmission Manual: Service and repair procedures for the Getrag 6-speed manual transmission (GS6-37BZ). Transmission Automatic: Service and repair procedures for the ZF 6-speed automatic transmission (6HP19TU). Drivetrain Rear Axle: Differential service, axle shaft replacement, wheel bearing inspection and replacement. Suspension Front: MacPherson strut assembly, control arms, anti-roll bar, steering components. Suspension Rear: Multi-link independent rear suspension, shock absorbers, springs, subframe. Brakes Front: Disc brake component replacement, caliper service, rotor specifications. Brakes Rear: Disc brake component replacement, caliper service, rotor specifications, parking brake mechanism. Steering: Hydraulic power steering system, steering rack, tie rods, steering column. Electrical Charging: Alternator, battery, voltage regulation, wiring diagrams. Electrical Starting: Starter motor, ignition switch, related relays and fuses. Lighting Exterior: Headlights, taillights, turn signals, fog lights, bulb types and replacement. Lighting Interior: Dome light, courtesy lights, instrument panel illumination. HVAC: Climate control system, A/C compressor, blower motor, refrigerant handling, cabin filter replacement. Infotainment Audio: Radio, amplifier, speaker replacement, antenna system. Body Exterior: Panel removal and installation, door mechanisms, hood, trunk lid, bumper systems. Body Interior: Seat removal, dashboard components, trim panels, headliner. Safety Airbags: Airbag system components, SRS module, sensor replacement. Safety ABS Dsc: Anti-lock Braking System (ABS), Dynamic Stability Control (DSC) system components and diagnostics. Procedures Included Routine Maintenance: Oil changes, filter replacements (oil, air, cabin), spark plug replacement, brake fluid flush, coolant flush. Troubleshooting: Diagnostic procedures for common and uncommon faults across all major systems. Repair Major: Engine rebuild, transmission overhaul, turbocharger replacement, suspension component replacement. Repair Minor: Component replacement (e.g., water pump, thermostat, starter, alternator), belt replacement, bulb replacement. Diagnostic Procedures: Step-by-step diagnostic workflows using manufacturer-specific tools and logic. Wiring Diagrams: Detailed electrical schematics for all vehicle systems. Torque Specifications: Precise torque values for all critical fasteners. Special Tools: Identification and usage of required BMW specialty tools. Technical Depth Depth Level: Comprehensive from basic maintenance to full engine and transmission rebuilds. Diagnostic Capability: Includes detailed diagnostics for complex electronic systems, engine performance issues, and chassis control modules. Recalibration Procedures: Procedures for electronic module calibration and initialization (e.g., throttle body, steering angle sensor). 📊 Manual Specifications File Format Software Type: Proprietary BMW service software format, often delivered via installation media or secure download. Accessibility: Searchable text, often with interactive diagrams and integrated VIN lookup. Print Quality Digital Resolution: High-resolution graphics, schematics, and photographs suitable for on-screen viewing and printing. Binding Type Binding: Not applicable (Software format). Paper Type Paper Type: Not applicable (Software format). ⚙️ Engine Specifications Primary Engine Engine Name: N54B30A Engine Configuration: 3.0L Twin-Turbocharged Inline 6-Cylinder Bore X Stroke: 84.0 mm x 89.6 mm Compression Ratio: 10.2:1 Valvetrain: Double Overhead Camshafts (DOHC), 24 Valves, VANOS (Variable Valve Timing) Performance Horsepower: 300 hp @ 5800 rpm Torque: 300 lb-ft @ 1400 rpm (with overboost up to 320 lb-ft) Fuel System Fuel Delivery: High-Pressure Direct Injection (DI) Turbochargers: Sequential Twin-Turbochargers (smaller turbo for low RPM, larger for high RPM) Fluid Specifications Oil Type Capacity: BMW Longlife-01 approved synthetic oil, 6.5 quarts (6.2 liters) with filter change. Coolant Type: BMW Blue Antifreeze/Coolant, 50/50 mix with distilled water. Known Issues Common Faults: High-pressure fuel pump failure, clogged fuel injectors, turbo wastegate rattle, ignition coil failures, oil leaks from valve cover gasket and oil pan gasket. 🔧 Transmission Standard Transmission Type Std: Getrag 6-speed Manual Transmission (GS6-37BZ) Optional Transmission Type Opt: ZF 6-speed Steptronic Automatic Transmission (6HP19TU) Features Clutch Type: Dual-mass flywheel with single dry-plate clutch (Manual). Automatic Features: Adaptive transmission control, Sport mode, Steptronic manual shift mode. Fluid Specifications Manual Trans Fluid: BMW MTF LT-3 or equivalent (e.g., Castrol Syntrans B 75W-85). Automatic Trans Fluid: ZF Lifeguardfluid 6 (approved for 6HP19TU). 📐 Dimensions Exterior Length: 173.1 inches (4397 mm) Width: 69.5 inches (1766 mm) Height: 54.6 inches (1387 mm) Wheelbase: 104.7 inches (2657 mm) Front Track: 59.4 inches (1508 mm) Rear Track: 60.4 inches (1535 mm) Weights Curb Weight Manual: Approximately 3450 lbs (1565 kg) Curb Weight Automatic: Approximately 3550 lbs (1610 kg) Gross Vehicle Weight...