🏷️ Basic Information Identification Make: BMW Model: 525i Model Code: E34 Year: 1990 Market Segment: Executive Sedan 👋 Introduction Market Position Positioning: The BMW 5 Series (E34) represented BMW's commitment to combining luxury, performance, and advanced engineering in the executive sedan segment. Competitive Analysis Competitors: Competed against vehicles like the Mercedes-Benz E-Class (W124), Audi 100/200, and Jaguar XJ. Key Features Design Philosophy: Elegance, driver-centric cockpit, balanced chassis, and inline-6 engine refinement. Target Audience: Discerning drivers valuing driving dynamics, build quality, and understated luxury. Manual Value Proposition Value: Essential resource for owners and independent workshops to maintain, diagnose, and repair the 1990 BMW 525i, saving on dealership labor costs. 📋 Manual Details Coverage Areas Primary Coverage: All service, repair, and maintenance procedures for the 1990 BMW 525i (E34 chassis). Engine Coverage: M20B25 inline-6 engine. Transmission Coverage: 4-speed automatic and 5-speed manual transmissions. Electrical Coverage: Complete wiring diagrams, component locations, and diagnostic procedures. Body Coverage: Body and chassis repair, interior trim, exterior panels, glass replacement. Suspension Coverage: Front and rear suspension, steering system, wheel alignment. Brake Coverage: Front and rear brake systems, including ABS (if equipped). Page Count Estimated Pages: 700+ Manual Type Type: Factory Service Repair Manual (FSM) Purpose: Comprehensive guide for diagnosis, repair, and maintenance. Language Language: English Format Format: Downloadable PDF Printability: Printable (entire manual or selected pages) Searchability: Searchable text content 📖 Manual Coverage Systems Covered Engine Management: Engine mechanical, fuel injection (Motronic), ignition, emissions control. Cooling System: Radiator, thermostat, water pump, coolant specifications. Exhaust System: Catalytic converter, mufflers, exhaust manifold. Climate Control: HVAC system, refrigerant, diagnosis. Lighting System: Headlights, taillights, interior lighting, wiring. Instrumentation: Gauges, warning lights, onboard diagnostics. Chassis Components: Frame, subframes, body mounts. Procedures Included Maintenance: Oil changes, filter replacements, spark plug service, belt inspection/replacement. Troubleshooting: Diagnostic flowcharts for common drivability and system issues. Repair Rebuild: Engine overhaul, transmission rebuild, suspension component replacement. Installation: Component installation, accessory fitting. Specifications: Torque values, clearances, fluid capacities, pressure specifications. Technical Depth Depth: Comprehensive, from basic adjustments to complete engine and transmission overhauls. Diagnostic Level: Advanced, including troubleshooting guides and diagnostic trouble codes (DTCs) where applicable for the era. Wiring Detail: Detailed wiring diagrams for all electrical systems. 📊 Manual Specifications File Format Format: PDF Print Quality Quality: High resolution, clear text and diagrams for legible printing. Binding Type Binding: N/A (Digital Download) Paper Type Paper: N/A (Digital Download) ⚙️ Engine Specifications Primary Engine Engine Code: M20B25 Configuration: Inline 6-cylinder, SOHC (Single Overhead Camshaft) Displacement: 2.5 Liters (2494 cc) Bore X Stroke: 84.0 mm x 75.0 mm Compression Ratio: 8.5:1 Performance Horsepower: 168 hp @ 5800 rpm (approx.) Torque: 164 lb-ft @ 4300 rpm (approx.) Fuel System Fuel Delivery: Bosch Motronic M1.3 Electronic Fuel Injection (EFI) Fuel Type: Premium Unleaded Gasoline (91 Octane or higher) Cooling System Coolant Type: BMW Blue Antifreeze (or equivalent silicate-free ethylene glycol-based) Oil Specs Recommended Oil Viscosity: 15W-40 or 20W-50 (depending on climate/usage), check manual for exact specs. Oil Capacity Capacity W Filter: 6.5 Liters (6.9 US quarts) 🔧 Transmission Standard Transmission Type: 5-speed manual transmission (Getrag 260/5) Optional Transmission Type: 4-speed automatic transmission (ZF 4HP22) Features Manual Clutch: Hydraulic clutch actuation. Fluid Specs Manual Fluid Type: MTF LT-2 (BMW Manual Transmission Fluid) or equivalent GL-4 gear oil. Fluid Specs Automatic Fluid Type: Dexron III (or equivalent ATF - Automatic Transmission Fluid). Fluid Capacity Manual Capacity: 1.3 Liters (1.4 US quarts) Fluid Capacity Automatic Capacity: 1.5 Liters (1.6 US quarts) for pan drop refill. 📐 Dimensions Exterior Length: 4715 mm (185.6 in) Width: 1751 mm (68.9 in) Height: 1410 mm (55.5 in) Wheelbase: 2797 mm (110.1 in) Weights Curb Weight: Approx. 1500-1550 kg (3300-3400 lbs) Wheels Tires Standard Wheel Size: 15 x 7.0 inch alloy wheels Standard Tire Size: 205/65VR15 Bolt Pattern: 5 x 120 mm Offset: ET 20 (typical) 🛡️ Safety Features Ratings NHTSA Front Impact: Not rated by modern standards, but designed with robust safety cage and energy-absorbing crumple zones. Passive Features Airbags: Driver's side airbag (standard on 1990 models). Seatbelts: 3-point inertia-reel seatbelts front and rear. Body Structure: Integrated safety cage, energy-absorbing steering column, reinforced doors. Active Features ABS: Anti-lock Braking System (ABS) standard on 525i. Traction Control: Optional ASC (Automatic Stability Control) available on some models. 💡 Technology Features Infotainment Radio: BMW Bavaria C Business Cassette or Professional RDS system (optional). Speakers: Typically 6 or 8 speaker system. Driver Assistance Cruise Control: Standard on 525i. Onboard Computer: Optional OBC (On-Board Computer) displaying fuel economy, range, and diagnostics. Connectivity Phone Integration: N/A for modern standards; optional dealer-installed car phones were available. 🔧 Maintenance Service Intervals Oil Change Interval: Every 7,500-10,000 miles or annually, consult manual for exact mileage and oil type. Spark Plug Replacement: Recommended every 30,000 miles (Bosch W8AC or equivalent). Drive Belt Inspection: Inspect serpentine belt (if applicable) or V-belts for wear and tension at every oil change, replace...