🏷️ Basic Information Identification Make: BMW Model: 135i Convertible Year: 2011 Codes Chassis Code: E88 Engine Code: N55B30 👋 Introduction Market Position Segment: Premium Compact Convertible Target Audience: Enthusiasts seeking a sporty, premium convertible with strong performance. Competitive Analysis Competitors: Audi A3 Cabriolet, Mercedes-Benz E-Class Convertible (prior generation), Infiniti G37 Convertible, Lexus IS Convertible. Key Features Usp: Rear-wheel drive platform, potent turbocharged inline-six engine, engaging driving dynamics, premium interior, retractable hardtop (in some earlier generations, but this is a soft-top convertible). Model Highlights Body Style: 2-door convertible 📋 Manual Details Coverage Areas Systems Covered: Introduction, Instrument Cluster, Entertainment Systems, Climate Controls, Lights, Driver Information, Seat Adjustments, Storage Compartments, Driving Experience Control, Doors and Windows, Convertible Top Operation, Mirrors, Steering Wheel Controls, Audio System, Navigation System, Communication System, Climate Control System, Interior Lighting, Exterior Lighting, Tire Pressure Monitoring System, On-Board Diagnostics, Maintenance Information, Vehicle Care, Troubleshooting, Emergency Procedures, Safety Features, Driving Assistance Systems, Vehicle Settings. Page Count Estimated Pages: 300-400 Manual Type Type: Owner's Manual Language Language: English Format Format: PDF 📖 Manual Coverage Systems Covered Powertrain: Engine operation and basic checks, transmission operation. Chassis: Brakes, steering, suspension (general operation and checks). Electrical: Lights, interior/exterior, instrument cluster, infotainment system, climate control, power windows, convertible top mechanism, mirrors. Body: Doors, locks, convertible top operation, storage, seating adjustments. Procedures Included Maintenance: Tire pressure checks, fluid level checks (oil, coolant, brake fluid, washer fluid), basic cleaning and care. Troubleshooting: Understanding warning lights and messages, basic troubleshooting for common issues, emergency procedures. Operation: Detailed operation of all vehicle systems, including infotainment, climate control, convertible top, lighting, and driver assistance features. Technical Depth Depth: Comprehensive user-level operation and maintenance, not intended for in-depth mechanical repair or diagnostics. 📊 Manual Specifications File Format File Type: Digital PDF Searchable Text: Yes Printable: Yes Print Quality Quality: Factory standard resolution (suitable for digital viewing and printing) Binding Type Binding: N/A (Digital Download) Paper Type Paper Type: N/A (Digital Download) ⚙️ Engine Specifications Primary Engine Engine Type: Inline 6-cylinder, Twin-Scroll Turbocharged Displacement: 3.0 Liters (2979 cc) Bore X Stroke: 84.0 mm x 89.6 mm Compression Ratio: 10.2:1 Performance Horsepower: 300 hp @ 5800 rpm Torque: 300 lb-ft @ 1300-5000 rpm Fuel System Fuel Delivery: Direct Injection (High-Precision Injection) Fuel Type: Premium Unleaded Gasoline (91 Octane or higher recommended) Cooling System Coolant Type: BMW Blue Antifreeze/Coolant Lubrication Oil Type: SAE 0W-40 Synthetic (BMW Longlife-01 approved) Oil Capacity: 6.5 US quarts (6.2 liters) with filter change 🔧 Transmission Standard Type: 6-speed Manual Transmission Optional Type: 7-speed M Double Clutch Transmission (DCT) with Drivelogic Features Clutch Type Manual: Hydraulic, single dry plate Fluid Type Manual: BMW MTF LT-3 (or equivalent) Fluid Type Dct: DCTF-1 (or equivalent) 📐 Dimensions Exterior Length: 168.0 inches (4267 mm) Width: 68.3 inches (1735 mm) Height: 54.7 inches (1390 mm) Wheelbase: 104.7 inches (2657 mm) Front Track: 59.0 inches (1500 mm) Rear Track: 60.0 inches (1525 mm) Weights Curb Weight Manual: Approx. 3638 lbs (1650 kg) Curb Weight Dct: Approx. 3715 lbs (1685 kg) Cargo Trunk Volume: Approx. 7.1 cu ft (with top up) Trunk Volume Top Down: Approx. 4.1 cu ft (with top down) Wheels Tires Standard Wheel Size: 18 x 7.5 inch front, 18 x 8.0 inch rear Standard Tire Size: 205/50R18 front, 225/45R18 rear Bolt Pattern: 5x120 mm Center Bore: 72.5 mm 🛡️ Safety Features Ratings NHTSA Overall Rating: Not explicitly rated as a convertible. Previous E88 generations often received 4-star front/5-star side ratings. IIHS Ratings: Typically performed well in frontal and side impact tests for its class. Active Features ABS: Standard Anti-lock Braking System Asc: Automatic Stability Control DTC: Dynamic Traction Control Dynamic Stability Control: Standard DSC with Cornering Brake Control (CBC) and Brake Drying Driver Assistance: Optional: Adaptive Headlights, Parking Distance Control (PDC) Passive Features Airbags: Front airbags, side airbags (integrated into seats), head protection system (curtain airbags in the A-pillars). Rollover Protection: Active rollover protection system (deployable roll bars behind rear headrests). Seat Belts: 3-point inertia-reel seat belts with pre-tensioners and force limiters. 💡 Technology Features Infotainment Head Unit: BMW Professional Radio or iDrive System Display: Central color display (7-inch or optional larger screen for iDrive) Audio: Standard 6-speaker system, optional Harman Kardon surround sound. Connectivity: Optional Bluetooth connectivity for hands-free calling and audio streaming, USB/Auxiliary input. Driver Assistance Cruise Control: Standard cruise control, optional Active Cruise Control (ACC) on some models. Parking Assistance: Optional Parking Distance Control (PDC) - front and rear sensors. Vehicle Settings Idrive Integration: Allows customization of vehicle settings, climate control, entertainment, navigation, and vehicle status information. 🔧 Maintenance Service Intervals Oil Change Interval: Condition-based service (CBS), typically 10,000-15,000 miles or annually. Brake Fluid Change: Every 2 years (as per CBS) Spark Plug Replacement: Approximately every 60,000 miles (refer to CBS for exact timing). Cabin Air Filter: Recommended annually or every 15,000 miles (refer to CBS). Fluid Specifications Engine...