🏷️ Basic Information Identification Make: BMW Model: 525i Codes Chassis Code: E28 Generation Generation Name: Second Generation (E28) 👋 Introduction Market Position Segment: Executive Sedan Positioning: BMW's mid-size luxury sedan, known for performance, handling, and build quality. Competitive Analysis Key Competitors: Mercedes-Benz W123/W124 E-Class, Audi 100/200, Volvo 700 Series, Jaguar XJ6. Key Features Driving Dynamics: Renowned 'Ultimate Driving Machine' characteristics, balanced chassis, responsive steering. Engine Smoothness: M30 inline-six engine is a benchmark for smoothness and power delivery. Build Quality: Solid construction, high-quality materials, and durable engineering. Design: Iconic Bertone-influenced styling, understated elegance. 📋 Manual Details Coverage Areas Model Years Covered: 1981, 1982, 1983, 1984, 1985, 1986, 1987, 1988, 1989, 1990, 1991 Page Count Estimated Page Count: Approximately 1000+ Manual Type Manual Type: Full Service and Repair Manual Language Language: English Format Format: Digital (PDF likely, though physical copy implied by sales context) 📖 Manual Coverage Systems Covered Engine: M30 2.5L Inline-6 Engine (M30B25) Fuel System: Bosch L-Jetronic Fuel Injection System Ignition System: Electronic Ignition (Distributor-based) Transmission: 4-Speed Automatic (e.g., ZF 4HP22) and 5-Speed Manual Transmissions (e.g., Getrag 260) Drivetrain: Rear-Wheel Drive (RWD) Suspension: Front: MacPherson Struts with Lower Control Arms. Rear: Semi-Trailing Arms, Compensating Spring. Brakes: Front: Ventilated Discs. Rear: Solid Discs. (ABS may be optional/standard depending on year/market) Steering: Recirculating Ball Steering System, Power Assisted Electrical System: 12V System, Alternator, Starter, Battery, Fuses, Relays, Wiring Diagrams Body And Chassis: Body Panel Removal/Installation, Frame Repair, Corrosion Protection Climate Control: HVAC System Diagnosis and Repair Interior: Trim, Seating, Dashboard Components Procedures Included Scheduled Maintenance: Oil Changes, Filter Replacements, Fluid Checks/Flushes, Tune-ups, Belt Inspections/Replacements Engine Repair: Top-end Overhaul, Bottom-end Rebuild, Component Replacement (e.g., Pistons, Rings, Bearings, Valves) Fuel System Repair: Injector Testing/Replacement, Fuel Pump Diagnosis, Fuel Pressure Regulator Servicing Transmission Repair: Clutch Replacement (Manual), Valve Body Servicing (Automatic), Seal Replacements Brake System Repair: Pad/Rotor Replacement, Caliper Rebuild, Fluid Bleeding, ABS System Diagnosis Suspension And Steering Repair: Component Replacement (Ball Joints, Bushings, Shocks/Struts), Alignment Procedures Electrical Diagnostics: Troubleshooting Short Circuits, Open Circuits, Component Testing Troubleshooting: Diagnostic Flowcharts, Common Problem Identification and Resolution Bodywork: Panel Alignment, Dent Repair, Rust Mitigation Technical Depth Diagnostic Capability: Advanced Diagnostics, Component Level Troubleshooting Repair Scope: Complete Overhaul, Component Replacement, System Rebuilding Technical Drawings: Detailed Exploded Views, Torque Specifications, Measurement Data 📊 Manual Specifications File Format File Type: Likely PDF Searchable Text: Expected for quality digital manuals Printable: Yes Print Quality Diagram Clarity: High (Expected for OEM-level manuals) Text Readability: Excellent Binding Type Binding: N/A (Digital) Paper Type Paper Quality: N/A (Digital) ⚙️ Engine Specifications Primary Engine Engine Code: M30B25 Engine Type: Naturally Aspirated Inline 6-Cylinder, SOHC Displacement: 2494 cc (2.5 Liters) Performance Horsepower: Approximately 150-155 hp (varies by market and year) Torque: Approximately 165-170 lb-ft (varies by market and year) Fuel System Fuel Delivery: Bosch L-Jetronic Electronic Fuel Injection (EFI) Fuel Type: Unleaded Gasoline (87 Octane minimum, premium recommended) Fuel Tank Capacity: Approximately 16.4 gallons (62 liters) 🔧 Transmission Standard Standard Transmission: 5-Speed Manual (Getrag 260) Optional Optional Transmission: 4-Speed Automatic (ZF 4HP22) Features Clutch Type: Single Dry Plate (Manual) Transmission Fluid Manual: Dexron III (or equivalent ATF) for automatic; Manual requires specific gear oil (e.g., SAE 75W-90) 📐 Dimensions Exterior Length: Approximately 188.2 inches (4780 mm) Width: Approximately 69.1 inches (1755 mm) Height: Approximately 54.7 inches (1390 mm) Wheelbase: Approximately 104.3 inches (2650 mm) Weights Curb Weight: Approximately 3200-3400 lbs (1450-1540 kg) 🛡️ Safety Features Ratings NHTSA Ratings: N/A (NHTSA ratings were not standardized in this format during the E28 era) Active Features ABS: Optional or standard on later models (Bosch ABS II) Passive Features Seatbelts: 3-point front, 2-point rear (optional 3-point rear on some models) Crumple Zones: Designed with front and rear crumple zones for impact absorption. 💡 Technology Features Infotainment Radio: AM/FM Radio with Cassette Player (often Blaupunkt or Becker units); optional CD player on later models. Onboard Computer: Optional On-Board Computer (OBC) providing trip data, fuel economy, and system checks. Driver Assistance Cruise Control: Standard or optional, electronically controlled. ABS: See safety section; early implementation of ABS. Connectivity Antenna: Power antenna (often electric) 🔧 Maintenance Service Intervals Oil Change Interval: Every 3,000-5,000 miles or 6 months, whichever comes first (depending on usage and oil quality) Coolant Flush Interval: Every 2 years or 30,000 miles Spark Plug Replacement: Every 30,000 miles (depending on plug type) Fluid Specifications Engine Oil: 15W-40 or 20W-50 (check owner's manual for specific viscosity based on temperature); API SF or SG rated Coolant: BMW Blue Coolant or equivalent ethylene glycol based antifreeze mixed 50/50 with distilled water Brake Fluid: DOT 3 or DOT 4 Power Steering Fluid: Dexron III ATF or specific BMW power steering fluid Known Issues Cooling System: Plastic radiator end tanks can become brittle; water pump seals can leak; heater control valves are prone to failure. Fuel System: Injector O-rings can degrade; fuel accumulator can fail; fuel pump...