🏷️ Basic Information Identification Make: BMW Model: 525i Year: 1990 Codes Chassis Code: E34 Engine Code: M50B25 👋 Introduction Market Position Segment: Executive Sedan (Mid-size luxury) Competitors: Mercedes-Benz E-Class (W124), Audi 100/200, Lexus ES 250, Jaguar XJ (XJ40). Key Features Design: Iconic E34 design by Claus Luthe, distinguished by its clean lines, Hofmeister kink, and double kidney grille. Known for aerodynamic efficiency and classic BMW proportions. Powertrain: Smooth and potent M50B25 inline-six engine, refined chassis, rear-wheel drive (RWD) bias, optional limited-slip differential (LSD). Interior: Driver-focused cockpit, high-quality materials, ergonomic seating, excellent build quality. Value Proposition Value: Offers a blend of performance, luxury, and enduring build quality, making it a desirable classic car that can be maintained to a high standard with the right documentation. 📋 Manual Details Coverage Areas Coverage: Full Service Repair Page Count Pages: Extensive (Exact count not specified, but implied to be comprehensive) Manual Type Type: Service and Repair Manual Language Language: English (Assumed based on product description phrasing) Format Format: Digital (Likely PDF, based on typical sales of such manuals) 📖 Manual Coverage Systems Covered Engine: Complete overhaul, diagnostics, tuning, fuel injection, ignition system, cooling system, exhaust system, lubrication system. Transmission: Manual and automatic transmission repair, overhaul, fluid service, diagnostics, driveline components. Brakes: Hydraulic system, ABS system, disc brake service, drum brake service (if applicable), parking brake, fluid specifications, bleeding procedures. Electrical: Complete wiring diagrams, component testing, diagnostic procedures for engine control, body electronics, lighting, instruments, power accessories. Suspension Steering: Front and rear suspension component replacement, alignment specifications, steering system diagnosis and repair, power steering. Body Chassis: Body panel repair, rust prevention, door mechanisms, glass replacement, interior trim, chassis component inspection and replacement. HVAC: Air conditioning system service, heater core replacement, blower motor, climate control diagnostics. Procedures Included Maintenance: Scheduled maintenance intervals, oil changes, filter replacements, spark plug service, belt inspection and replacement, fluid level checks and top-offs. Repair: Detailed step-by-step repair instructions for all major vehicle systems, including engine rebuilding, transmission overhauls, and electrical component replacement. Diagnostics: Troubleshooting guides, diagnostic flowcharts, symptom-based problem resolution, interpretation of diagnostic trouble codes (DTCs) if applicable to the era's systems. Rebuilding: Comprehensive instructions for rebuilding major components like the engine, transmission, and differential. Refurbishment Restoration: Guidance on refurbishing and restoring various parts of the vehicle, including bodywork, interior, and mechanical components. Technical Depth Depth: Expert-level. Covers everything from basic fluid changes to complete engine and transmission rebuilds, including in-depth electrical diagnostics and schematics. 📊 Manual Specifications File Format Format: PDF (Likely, with searchable text and high-resolution diagrams) Print Quality Quality: High Resolution (Expected for clear diagrams and text) Binding Type Binding: N/A (Digital Format) Paper Type Paper: N/A (Digital Format) ⚙️ Engine Specifications Primary Engine Engine Type: Naturally Aspirated Inline-6 Cylinder Displacement: 2494 cc (2.5 Liters) Bore X Stroke: 84.0 mm x 90.0 mm Compression Ratio: 8.8:1 Valvetrain: DOHC (Dual Overhead Camshafts), 4 valves per cylinder (24 valves total) Performance Horsepower: 168 hp @ 5500 rpm (DIN) Torque: 226 Nm (167 lb-ft) @ 4300 rpm (DIN) Fuel System Fuel Delivery: Bosch Motronic Electronic Fuel Injection (EFI) Fuel Type: Unleaded Gasoline (Premium recommended) Ignition System System: Electronic Ignition with Knock Sensor Control Lubrication System Oil Capacity: 6.5 Liters (6.9 US Quarts) with filter change Cooling System Coolant Capacity: 10.0 Liters (10.6 US Quarts) 🔧 Transmission Standard Type: 5-Speed Manual Transmission (Getrag 260/5) Optional Type: 4-Speed Automatic Transmission (ZF 4HP-22) Features Driveline: Rear-Wheel Drive (RWD) Differential: Open Differential (Optional Limited-Slip Differential - LSD) Fluid Specs Manual Fluid: BMW ATF Dexron II (or equivalent) Automatic Fluid: BMW ATF Dexron II (or equivalent) 📐 Dimensions Exterior Length: 4720 mm (185.8 inches) Width: 1751 mm (68.9 inches) Height: 1410 mm (55.5 inches) Wheelbase: 2760 mm (108.7 inches) Weights Curb Weight: 1540 kg (3395 lbs) (Approximate, varies with transmission and options) Gross Vehicle Weight: 2000 kg (4409 lbs) (Approximate) Cargo Trunk Volume: 460 Liters (16.2 cubic feet) 🛡️ Safety Features Ratings NHTSA Driver Front Impact: Not explicitly rated by modern NHTSA standards, but generally considered robust for its era. IIHS Side Impact: Not explicitly rated by modern IIHS standards, but generally considered robust for its era. Active Features ABS: Standard Anti-lock Braking System (ABS) Passive Features Airbags: Driver-side airbag standard on 1990 models. Passenger airbag optional or standard on later E34 iterations of this year. Seatbelts: 3-point inertia-reel seatbelts with pretensioners (front seats). Chassis Structure: Reinforced safety cell, crumple zones front and rear for energy absorption. 💡 Technology Features Infotainment Audio System: BMW Bavaria C (Cassette player) or similar era premium audio systems with optional CD changer integration. Display: Simple dot-matrix displays for OBC (On-Board Computer) and climate control. Driver Assistance Cruise Control: Standard or Optional electronic cruise control system. Connectivity Phone Integration: Not applicable for modern connectivity; early optional car phone integration may exist. 🔧 Maintenance Service Intervals Oil Change Interval: Every 7,500-10,000 miles...