🏷️ Basic Information Identification Make: BMW Model: 525i Year: 1986 Codes Chassis Code: E28 Engine Code Primary: M30B27 👋 Introduction Market Position Segment: Luxury Mid-size Sedan Era Positioning: Established itself as a benchmark for handling, build quality, and understated luxury in its class. Competitive Analysis Key Competitors: Mercedes-Benz W124 E-Class, Audi 100/200, Jaguar XJ6 Key Features Driving Dynamics: Renowned for its balanced chassis, precise steering, and engaging driving experience. Build Quality: Exceptional build quality and durable materials, typical of BMW's engineering prowess. Powertrain: Smooth and reliable M30 straight-six engine known for its torque and longevity. 📋 Manual Details Coverage Areas Primary Coverage: Full Service, Repair, Maintenance, Rebuild, Refurbish, Restoration Diagnostic Coverage: Extensive diagnostic procedures and troubleshooting Page Count Estimated Pages: Over 1500 (estimated for comprehensive coverage) Manual Type Type: Full Service & Repair Manual Language Language: English Format Format: Digital (likely PDF, though not explicitly stated) 📖 Manual Coverage Systems Covered Engine Mechanical: Engine teardown, assembly, overhaul, timing, lubrication system, cooling system Engine Electrical: Ignition system, fuel injection system (Bosch Motronic), starter, alternator, wiring diagrams Transmission: Manual (Getrag 260) and Automatic (ZF 4HP22) transmission repair, maintenance, overhaul Drivetrain: Clutch, driveshaft, differential, rear axle assembly Suspension: Front and rear suspension components, geometry, alignment, shock absorbers, springs, bushings Brakes: Front and rear disc brake systems, hydraulic components, ABS (if equipped), parking brake Steering: Power steering system, steering rack, steering column Fuel System: Fuel tank, fuel pump, fuel lines, fuel injectors, fuel pressure regulator Exhaust System: Exhaust manifold, catalytic converter, muffler, pipes HVAC: Heating, Ventilation, and Air Conditioning system diagnosis and repair Electrical System: Lighting, instrumentation, power windows, central locking, wipers, horn, fuse box, relays Body And Chassis: Body panels, doors, glass, interior trim, chassis lubrication Procedures Included Routine Maintenance: Oil change, filter replacements, fluid checks and top-offs, spark plug replacement, belt inspection and replacement Troubleshooting: Diagnostic charts for common problems and symptoms, fault code interpretation (for Motronic) Component Repair: Detailed instructions for disassembling, inspecting, repairing, and reassembling all major vehicle components Overhaul Rebuild: Complete engine and transmission overhaul procedures with torque specifications and clearances Electrical Diagnosis: Step-by-step troubleshooting for electrical faults using wiring diagrams and test procedures Bodywork: Minor body repairs, panel alignment, window replacement procedures Technical Depth Depth: Comprehensive: from basic maintenance to full engine/transmission rebuilds and advanced electrical diagnostics 📊 Manual Specifications File Format Digital Format: PDF (Assumed: Searchable text, high-resolution diagrams) Print Quality Diagram Quality: High-resolution, clear, and detailed diagrams and schematics Binding Type Binding: N/A (Digital format) Paper Type Paper Quality: N/A (Digital format) ⚙️ Engine Specifications Primary Engine Engine Type: Inline 6-cylinder, SOHC (M30B27) Displacement: 2693 cc (2.7 Liters) Bore X Stroke: 84.0 mm x 81.0 mm Compression Ratio: 8.5:1 (typical for US spec) Valve Train: SOHC, 12 Valves (2 per cylinder) Performance Horsepower Net: Approx. 170 hp @ 5800 rpm (US Spec) Torque Net: Approx. 214 lb-ft (290 Nm) @ 3500 rpm (US Spec) Fuel System Fuel Delivery: Bosch L-Jetronic Fuel Injection (or Motronic for later models/specific markets) Fuel Type: Unleaded Gasoline (Premium) Lubrication Oil Capacity W Filter: Approx. 6.5 Liters (6.9 US Quarts) Cooling System Coolant Capacity: Approx. 10 Liters (10.6 US Quarts) Ignition System Ignition Type: Electronic Ignition (Bosch) 🔧 Transmission Standard Type: 5-speed Manual (Getrag 260/5) Optional Type: 4-speed Automatic (ZF 4HP22) Features Manual Gear Ratios: Refer to manual for specific ratios (e.g., 1st: 4.00:1, 2nd: 2.13:1, 3rd: 1.42:1, 4th: 1.00:1, 5th: 0.81:1) Automatic Fluid Fluid Type: Dexron-III (or equivalent, check manual for specific BMW P/N) Automatic Capacity Fluid Capacity: Approx. 7.5 Liters (7.9 US Quarts) - for ZF 4HP22 📐 Dimensions Exterior Length: Approx. 4620 mm (181.9 in) Width: Approx. 1700 mm (66.9 in) Height: Approx. 1420 mm (55.9 in) Wheelbase: Approx. 2795 mm (110.0 in) Weights Curb Weight: Approx. 1450-1550 kg (3197-3417 lbs) depending on options Gross Vehicle Weight Rating: Refer to vehicle's VIN plate for specific rating Cargo Trunk Volume: Approx. 480 Liters (17.0 cu ft) 🛡️ Safety Features Ratings Crash Test History: Limited official crash test data from the era. E28 platform considered robust for its time. Active Features ABS: Optional Anti-lock Braking System (ABS) available on some models. Passive Features Seat Belts: Front and rear seat belts Headrests: Adjustable front headrests Crumple Zones: Designed with front and rear crumple zones for energy absorption. 💡 Technology Features Infotainment Audio System: Original BMW Bavaria C or optional cassette player with basic speaker system. Often upgraded by owners. Driver Assistance ABS Availability: Optional on some models, not standard. Connectivity Connectivity Features: Basic, with focus on vehicle systems rather than external connectivity. 🔧 Maintenance Service Intervals Oil Change: Typically every 7,500 - 10,000 miles (12,000 - 16,000 km) or annually, depending on driving conditions. Refer to manual for specific recommendations. Air Filter: Inspect every 15,000 miles (24,000 km), replace as needed or every 30,000 miles (48,000 km). Spark Plugs: Replace approximately every...