🏷️ Basic Information Identification Make: BMW Model: 5-Series Chassis Code: E34 Specific Model Variant: 525i Codes Engine Code Primary: M50B25 👋 Introduction Market Position Segment: Executive Sedan Target Audience: Luxury car buyers seeking performance and refinement Competitive Analysis Key Competitors: Mercedes-Benz W124 E-Class, Audi V8 Quattro, Lexus LS 400 (late models) Key Features Platform Strength: Renowned for its advanced engineering, superior handling, and build quality Engine Smoothness: M50 inline-six engine known for its NVH characteristics Design Philosophy: Elegant, timeless design with driver-centric ergonomics 📋 Manual Details Coverage Areas Model Years Covered: 1990-1991 Regions Covered: Global (primarily North American and European specifications) Page Count Estimated Page Count: 1500+ Manual Type Type: Factory Service Repair Manual Language Language: English Format Format: Digital (PDF) 📖 Manual Coverage Systems Covered Powertrain: Engine mechanicals, fuel system, ignition system, cooling system, lubrication system, exhaust system, engine management (DME) Drivetrain: Manual and automatic transmissions, driveshafts, differentials, axles Chassis: Suspension (front and rear), steering system, braking system (including ABS) Electrical System: Battery, charging system, starter, lighting, instrument cluster, wiring diagrams, control modules (ECU, ABS, etc.) Body And Interior: Body panels, doors, windows, locks, seating, HVAC system, interior trim Procedures Included General Maintenance: Oil changes, filter replacements, spark plug replacement, coolant flushes, brake fluid replacement Engine Repair: Cylinder head removal/installation, piston and ring replacement, crankshaft and bearing service, timing chain and guide replacement Transmission Service: Clutch replacement (manual), transmission fluid and filter changes (automatic), internal transmission repair Brake System Overhaul: Brake pad and rotor replacement, caliper service, brake line replacement, ABS component diagnosis and replacement Electrical Diagnosis: Troubleshooting wiring issues, diagnosing sensor faults, module testing and replacement, using BMW diagnostic tools (DIS) Suspension And Steering: Strut and shock absorber replacement, control arm and ball joint replacement, power steering system service Technical Depth Depth Level: Comprehensive Factory Level Diagnostic Capabilities: Includes detailed troubleshooting flowcharts, error code explanations, and component testing procedures Rebuild Procedures: Covers complete engine and transmission rebuilds with torque specifications and clearances 📊 Manual Specifications File Format Digital Format Details: Searchable PDF, optimized for printing Print Quality Print Recommendation: High-resolution scans for clear diagrams and text Binding Type Binding Type: N/A (Digital) Paper Type Paper Type: N/A (Digital) ⚙️ Engine Specifications Primary Engine Engine Name: M50B25 Engine Type: Inline 6-cylinder, DOHC, 24 valves Displacement: 2.5 Liters (2494 cc) Bore X Stroke: 84 mm x 75 mm Compression Ratio: 8.8:1 Performance Horsepower: 189 hp @ 5900 rpm (DIN) Torque: 181 lb-ft @ 4200 rpm (DIN) Fuel System Fuel Delivery: Bosch Motronic M3.1 Fuel Injection Fuel Type: Premium Unleaded Gasoline (91+ octane recommended) Other Features Valvetrain: Dual Overhead Camshafts (DOHC) Engine Management: Digital Motor Electronics (DME) 🔧 Transmission Standard Type: Getrag 260 5-Speed Manual Transmission Optional Type: ZF 4HP22 4-Speed Automatic Transmission Features Gear Ratios Manual 5Spd: 3.72 / 2.03 / 1.41 / 1.00 / 0.81 (approx.) Clutch Type: Hydraulically actuated single-plate dry clutch Fluid Specifications Manual Transmission Fluid: BMW MTF LT-2 or equivalent (e.g., Red Line MT-90) Automatic Transmission Fluid: Dexron III or equivalent 📐 Dimensions Exterior Length: 4719 mm (185.8 in) Width: 1751 mm (68.9 in) Height: 1413 mm (55.6 in) Wheelbase: 2761 mm (108.7 in) Weights Curb Weight: 1530 kg (3373 lbs) (approx., manual transmission) 🛡️ Safety Features Ratings Era Specific Ratings: NHTSA ratings were not as standardized as today; focused on passive safety features for the era. Active Features Anti Lock Braking System: Standard Bosch ABS III Traction Control: Optional ASC+T (Automatic Stability Control and Traction) Passive Features Airbags: Driver's side airbag standard, passenger airbag optional Body Construction: Reinforced safety cage, crumple zones Seatbelts: 3-point inertia-reel seatbelts front and rear 💡 Technology Features Infotainment Audio System: Factory BMW Business or Professional CD/Cassette systems, often with premium speaker options (e.g., Harman Kardon) Navigation: Optional BMW Navigation System (era-specific, often a bulky unit) Driver Assistance Cruise Control: Standard Parking Sensors: Not available on these early models Connectivity Bluetooth: Not available from factory Climate Control HVAC System: Manual or Automatic Climate Control (ECC - Electronic Climate Control) 🔧 Maintenance Service Intervals Oil Change Interval: Every 7,500 to 10,000 miles (12,000-16,000 km) or annually, depending on driving conditions. BMW's Condition Based Service (CBS) system may recommend shorter intervals. Spark Plug Replacement: Approximately every 60,000 miles (96,000 km) for standard plugs, or 100,000 miles (160,000 km) for long-life plugs (refer to manual for specific type). Coolant Flush: Every 2-3 years or 30,000 miles (48,000 km) Transmission Fluid Change: Manual: Inspect every 30,000 miles; Automatic: Check condition regularly, BMW recommended replacement intervals vary by year but generally around 60,000 miles. Fluid Specifications Engine Oil Capacity: 6.5 Liters (6.9 US Quarts) with filter change (refer to manual for exact capacity based on engine variant) Engine Oil Specification: BMW Longlife-01 (LL-01) or LL-04 approved synthetic oil, viscosity grade 5W-30 or 5W-40 recommended Coolant Type: BMW Blue Antifreeze (G48) or equivalent ethylene glycol based coolant...