🏷️ Basic Information Identification Make: BMW Model: 525i Chassis Code: E28 Model Years Covered: 1981-1988 Codes Engine Code E28 525I: M30B25 (specific variants exist, e.g., 2.5L inline-six) 👋 Introduction Market Position Era Positioning: The E28 5 Series represented BMW's 'executive' sedan offering in the 1980s, known for its blend of performance, luxury, and engineering. Target Audience: Enthusiasts, owners, and independent mechanics seeking to maintain, repair, or restore their E28 525i. Competitive Analysis Competitors: Mercedes-Benz W124 E-Class, Audi 100/200, Volvo 240/700 series, Cadillac Sedan de Ville. Key Features Vehicle Strengths: Excellent handling, powerful inline-six engines, robust build quality, driver-focused interior, classic BMW design. Manual Value Proposition: Provides in-depth, authoritative information essential for preserving the longevity and performance of a classic BMW. 📋 Manual Details Coverage Areas Primary Coverage: Service, Repair, Maintenance, Rebuild, Refurbishment, Restoration Page Count Estimated Page Count: Hundreds of Pages (specific count not provided, but indicative of comprehensive coverage) Manual Type Type: Service and Repair Manual Language Language: English (presumed based on product listing) Format Format: PDF 📖 Manual Coverage Systems Covered Engine Mechanical: Complete engine overhaul, cylinder head, block, pistons, crankshaft, camshafts, valve train, timing systems, lubrication, cooling. Engine Management: Fuel injection (Bosch Motronic), ignition systems, sensors, actuators, troubleshooting diagnostics. Transmission: Manual and automatic transmission service, rebuild procedures, clutch, torque converter, shift mechanisms, fluid specifications. Drivetrain: Driveshafts, CV joints, differential, rear axle assembly, wheel bearings. Suspension: Front and rear suspension components, shock absorbers, struts, springs, control arms, bushings, alignment specifications. Steering: Steering rack, power steering system, steering column, tie rods, troubleshooting. Brakes: Front and rear brake systems (disc brakes), ABS (if equipped), master cylinder, calipers, pads, rotors, brake lines, bleeding procedures. Electrical System: Battery, charging system (alternator), starting system (starter motor), lighting, horns, wipers, power windows, fuse box, relays. Bodywork And Chassis: Body panel repair, interior trim, doors, windows, locks, body sealing, structural integrity, rust prevention and repair. HVAC: Heating, ventilation, and air conditioning system diagnosis and repair, refrigerant, components. Procedures Included Routine Maintenance: Oil changes, filter replacements, fluid checks and top-offs, spark plug replacement, belt inspections. Diagnostic Procedures: Troubleshooting guides for common problems, symptom-based diagnosis, diagnostic trouble codes (DTCs) for relevant systems. Repair Procedures: Step-by-step instructions for component removal, installation, adjustment, and repair for all covered systems. Rebuilding Procedures: Detailed instructions for engine and transmission rebuilds, including part specifications and clearances. Restoration Guidance: Information valuable for restoring the vehicle, including original specifications and potential sourcing of parts. Technical Depth Depth: Comprehensive (covers everything from basic maintenance to full rebuilds and diagnostics). Detail Level: High (includes detailed diagrams, torque specifications, clearances, and part numbers where applicable). 📊 Manual Specifications File Format File Type: PDF Searchable Text: Likely searchable text (common for professionally created PDF manuals). Print Quality Quality: High Resolution (expected for a detailed PDF manual, allowing for clear diagrams and text). Binding Type Binding: N/A (Digital PDF Format) Paper Type Paper: N/A (Digital PDF Format) ⚙️ Engine Specifications Primary Engine Engine Type: Inline-Six Cylinder, Naturally Aspirated Displacement: 2.5 Liters (approx. 2494 cc) Bore X Stroke: 84.0 mm x 75.0 mm (typical for M30B25) Compression Ratio: Typically 8.5:1 or 9.0:1 depending on variant Valve Train: SOHC (Single Overhead Camshaft), 2 valves per cylinder Performance Horsepower: Approx. 150-170 hp (varies slightly by market and specific engine tune) Torque: Approx. 160-175 lb-ft (varies slightly by market and specific engine tune) Fuel System Injection System: Bosch L-Jetronic or Motronic (fuel injection) Fuel Type: Unleaded gasoline (Premium Octane recommended) Cooling System Coolant Type: BMW recommended coolant (typically a silicate-free ethylene glycol based coolant) mixed 50/50 with distilled water. Lubrication Oil Type: API SF or SG, SAE 20W-50 or 15W-40 (refer to manual for precise specification and seasonal recommendations) Oil Capacity: Approx. 6.0 - 6.5 Liters (6.3 - 6.9 US Quarts) with filter change. 🔧 Transmission Standard Type: 4-speed Manual Transmission (Getrag 265 common) Optional Type: 3-speed or 4-speed Automatic Transmission (ZF 4HP22 common) Features Manual Gear Ratios: Specific ratios are available in the manual, e.g., 1st: 3.72, 2nd: 2.40, 3rd: 1.57, 4th: 1.00, R: 3.15 (example, consult manual for exact ratios). Fluid Type Manual Transmission Fluid: GL-4 or GL-5 Hypoid Gear Oil, SAE 75W-90 or 80W-90 (refer to manual for exact specification). Automatic Transmission Fluid: Dexron II or equivalent (refer to manual for exact specification). 📐 Dimensions Exterior Length: Approx. 4725 mm (186.0 in) Width: Approx. 1700 mm (66.9 in) Height: Approx. 1415 mm (55.7 in) Wheelbase Wheelbase: Approx. 2795 mm (110.0 in) Weights Curb Weight: Approx. 1450 - 1550 kg (3197 - 3417 lbs) depending on equipment. 🛡️ Safety Features Ratings Crash Testing: No official NHTSA/IIHS ratings for this era in the modern sense, but known for robust passive safety for its time. Active Features ABS: Optional Anti-lock Braking System (ABS) available on some models. Passive Features Seatbelts: Three-point front seatbelts, two-point rear seatbelts standard. Body Construction: Integral safety cage, crumple...