🏷️ Basic Information Identification Make: BMW Model: 525i Year: 1998 Codes Chassis Code: E39 Engine Code Common: M52B25 👋 Introduction Market Position Segment: Executive Sedan Target Audience: Affluent professionals, driving enthusiasts Competitive Analysis Key Competitors: Mercedes-Benz E-Class, Audi A6, Lexus GS, Jaguar S-Type Key Features Vehicle Strengths: Driving dynamics, build quality, luxury interior, refined powertrain Manual Value Proposition: Enables owners to maintain and repair their vehicle to factory standards, maximizing longevity and performance 📋 Manual Details Coverage Areas Repair Procedures: Comprehensive Maintenance Schedules: Detailed Diagnostics: Extensive Troubleshooting Guides: Included Rebuilding Procedures: Included Refurbishment Restoration: Covered Page Count Estimated Pages: 1500+ Manual Type Type: Full Service Repair Manual Language Language: English Format Format: Digital (PDF) 📖 Manual Coverage Systems Covered Engine: Detailed internal and external components, lubrication, cooling, fuel, ignition, exhaust, emission controls Transmission Manual: Clutch, gearbox, shift mechanisms, repairs, fluid service Transmission Automatic: Hydraulic system, valve body, torque converter, electronic controls, repairs, fluid service Drivetrain: Driveshaft, differential, axles, CV joints, hub bearings Suspension: Front and rear suspension components, shock absorbers, springs, control arms, bushings, alignment specifications Steering: Power steering system, steering rack, tie rods, steering column, pump, fluid service Brakes: Front and rear disc brakes, ABS system, hydraulic lines, master cylinder, calipers, pads, rotors, fluid replacement and bleeding Electrical System: Battery, charging system, starter, ignition system, lighting, fuses, relays, wiring diagrams Body And Chassis: Frame, body panels, doors, hood, trunk, bumpers, interior trim, glass, sunroof Climate Control: HVAC system, A/C compressor, condenser, evaporator, heater core, blower motor, refrigerant, diagnosis Safety Systems: Airbags, seatbelts, SRS system diagnosis Procedures Included Routine Maintenance: Oil changes, filter replacements, fluid checks and top-offs, spark plug replacement, belt inspection/replacement Component Replacement: Engine components, transmission, suspension parts, brake components, electrical modules, sensors Troubleshooting Diagnostic Trees: Systematic approach to identifying and resolving common and uncommon faults Wiring Diagrams: Comprehensive schematics for all electrical systems Torque Specifications: Detailed torque values for all critical fasteners Special Tools: Identification and usage instructions for BMW-specific tools Recalibration Procedures: Post-component replacement procedures where applicable Technical Depth Depth: Expert-level detail suitable for professional technicians and advanced DIY enthusiasts Diagnostic Code Coverage: Explanation of OBD-II codes relevant to the 1998 model year Engine Rebuilds: Complete teardown and reassembly instructions Transmission Rebuilds: Detailed instructions for both manual and automatic transmissions 📊 Manual Specifications File Format File Type: PDF Searchability: Searchable text content Printability: Printable pages Print Quality Image Resolution: High-resolution diagrams and illustrations Clarity: Clear and legible text and graphics Binding Type Binding: N/A (Digital Format) Paper Type Paper Quality: N/A (Digital Format) ⚙️ Engine Specifications Primary Engine Engine Code: M52B25TU (Late 1998 models may have TU variants) Engine Type: Inline 6-cylinder, Double VANOS Displacement Liters: 2.5 Displacement Cubic Inches: 2494 Bore Mm: 84.0 Stroke Mm: 75.0 Compression Ratio: 10.2:1 Horsepower Hp: 189 @ 5900 RPM Torque Lb Ft: 245 @ 3500 RPM Fuel System Fuel Delivery: Multi-Point Fuel Injection (Bosch Motronic ME 7.2) Fuel Type: Premium Unleaded Gasoline (91+ Octane) Emissions Control: Secondary Air Injection, Catalytic Converter, EGR (where applicable) 🔧 Transmission Standard Transmission Type: 5-Speed Manual (Getrag GS5-39DZ) Optional Transmission Type: 5-Speed Automatic (ZF 5HP18 or 5HP19) Features Automatic Modes: Standard, Sport, Manual Shift (Steptronic on some later models) Fluid Specifications Automatic Transmission Fluid: BMW LT-2 or Dexron III/Mercon compatible Manual Transmission Fluid: BMW MTF LT-2 or equivalent GL-4 specification 📐 Dimensions Exterior Length Mm: 4770 Width Mm: 1797 Height Mm: 1437 Wheelbase Mm: 2830 Front Track Mm: 1510 Rear Track Mm: 1526 Weights Curb Weight Kg Manual: 1530 Curb Weight Kg Automatic: 1550 Cargo Trunk Volume Liters: 520 🛡️ Safety Features Ratings NHTSA Front Impact: 4/5 Stars (driver/passenger) IIHS Side Impact: Acceptable (for comparable vehicles of the era) Active Features ABS: Standard (Bosch ABS III) Traction Control: Optional (ASC+T) Passive Features Airbags: Driver and Passenger front airbags Seatbelts: Pre-tensioning front seatbelts Chassis Design: Reinforced safety cell, crumple zones 💡 Technology Features Infotainment Head Unit: BMW Business RDS or Professional RDS (optional) Navigation: Optional (MK I or MK II navigation system) Audio: Optional Harman Kardon sound system Driver Assistance Cruise Control: Standard Parking Sensors: Optional (rear parking assist) Connectivity Cellular: Optional integrated mobile phone preparation Diagnostics Interface: OBD-II connector, BMW proprietary 20-pin diagnostic connector 🔧 Maintenance Service Intervals Oil Change Interval Miles: 7,500 - 10,000 (depending on oil quality and driving conditions) Air Filter Replacement Miles: 30,000 - 60,000 Spark Plug Replacement Miles: 60,000 - 100,000 (depending on plug type) Coolant Flush Miles: 30,000 - 60,000 Brake Fluid Flush Years: 2 Fluid Specifications Engine Oil Type: SAE 5W-30 or 5W-40 Synthetic (BMW Longlife-98 or LL-01) Engine Oil Capacity Liters: 6.5 Coolant Type: BMW Blue (G48 Ethylene Glycol) Power Steering Fluid: BMW ATF Dexron III Known Issues Common Issues Engine: PCV system issues (oil consumption, vacuum leaks), oil filter housing gasket leaks, VANOS solenoids/seals failure, spark plug well seals Common Issues Cooling: Plastic coolant expansion...