🏷️ Basic Information Identification Make: BMW Model: 5 Series Model Variant: 525i, 528i Generation Generation Name: E28 Codes Chassis Code: E28 👋 Introduction Market Position Positioning: Executive sedan, renowned for performance, luxury, and driving dynamics, competing with Mercedes-Benz W123/W124, Audi 5000, Volvo 700 series Competitive Analysis Key Competitors: Mercedes-Benz W123/W124, Audi 5000 (Type 44), Volvo 700 Series Key Features Driving Experience: Balanced chassis, responsive steering, robust inline-six engines, focus on driver engagement Design Philosophy: Elegance, functionality, and understated sportiness characteristic of BMW's design language of the era 📋 Manual Details Coverage Areas Years Covered: 1981, 1982, 1983, 1984, 1985, 1986, 1987, 1988 Page Count Estimated Pages: Over 1500 (typical for comprehensive service manuals of this era) Manual Type Type: Factory Authorized Repair Manual / Service Manual Language Language: English Format Format: Print (original) / Digital (e.g., PDF) 📖 Manual Coverage Systems Covered Engine: BMW M30 inline-six (2.5L and 2.8L variants), fuel injection (Bosch L-Jetronic, Motronic), ignition, cooling, lubrication, exhaust Transmission: Getrag 260 5-speed manual, ZF 4HP22 4-speed automatic; clutch, drivetrain, driveshaft, differential Suspension Steering: Front strut suspension, rear semi-trailing arm suspension, power steering system, steering linkage Brakes: Front ventilated discs, rear solid discs, ABS (Anti-lock Braking System) for certain models/years, brake hydraulics, parking brake Electrical System: Battery, alternator, starter, lighting, ignition system, fuse box, wiring diagrams, body control modules, fuel pump relay, EML (Electronic Motor Control) for later models Body Chassis: Body panel removal/installation, door mechanisms, window regulators, interior trim, seals, structural components Climate Control: HVAC system operation, blower motor, evaporator, heater core, A/C system (if equipped) Procedures Included Maintenance: Oil change, filter replacement, spark plug service, coolant flush, brake fluid change, lubrication points, belt replacement Troubleshooting: Diagnostic charts, symptom-based fault finding for engine, electrical, and mechanical systems Repair: Engine component overhaul (e.g., cylinder head, pistons), transmission rebuild, brake system repair, suspension component replacement, electrical component repair Installation: Component replacement (e.g., water pump, fuel injectors), accessory installation guidelines Diagnostics: Diagnostic trouble codes (if applicable to EFI systems), electrical system troubleshooting charts, mechanical testing procedures. Technical Depth Depth: Comprehensive factory-level detail, including torque specifications, tolerances, diagnostic procedures, and exploded views Precision Measurements: Detailed specifications for engine component clearances, torque values for all fasteners, bearing clearances, and runout measurements. 📊 Manual Specifications File Format Digital Format: PDF (Searchable text, high-resolution scans) Print Quality Print Quality: High-resolution scans of original factory manuals, ensuring clarity of diagrams and text Binding Type Binding: Digital (for PDF) / Original printed manual might be coil-bound or perfect-bound Paper Type Paper Type: N/A for digital, Original manuals typically printed on durable, coated paper ⚙️ Engine Specifications Primary Engine Engine Code 525I: M30B25 Engine Code 528I: M30B28 Performance 525I Horsepower 525I: Approx. 168 hp @ 5800 rpm (varies by market and year) Torque 525I: Approx. 220 Nm (162 lb-ft) @ 4000 rpm (varies) Performance 528I Horsepower 528I: Approx. 181 hp @ 5500 rpm (varies by market and year) Torque 528I: Approx. 240 Nm (177 lb-ft) @ 4000 rpm (varies) Fuel System Injection System: Bosch L-Jetronic or Motronic electronic fuel injection (EFI) Fuel Type Fuel Requirement: Unleaded gasoline (Octane rating as per manufacturer recommendation) Engine Construction Block Material: Cast Iron Head Material: Aluminum Alloy 🔧 Transmission Standard Transmission Type Standard: Getrag 260 5-speed manual transmission Optional Transmission Type Optional: ZF 4HP22 4-speed automatic transmission Features Clutch Type: Hydraulically actuated single dry plate clutch Rear Axle Ratio: Varies by model and transmission, typically around 3.25:1 or 3.46:1 Fluid Specifications Manual Transmission Fluid: API GL-4, SAE 75W-90 or equivalent (check manual for specific BMW PN) Automatic Transmission Fluid: Dexron II or equivalent (check manual for specific BMW PN) 📐 Dimensions Exterior Length: Approx. 4620 mm (181.9 in) Width: Approx. 1700 mm (66.9 in) Height: Approx. 1415 mm (55.7 in) Wheelbase: Approx. 2795 mm (110.0 in) Weights Curb Weight Approx: Approx. 1400-1500 kg (3086-3307 lbs), depending on equipment Gross Vehicle Weight Rating: Varies by specific model and market 🛡️ Safety Features Ratings Crash Testing Era: Standards and testing procedures were less rigorous than modern times; specific ratings may not be directly comparable Active Features ABS: Available on later models and higher trims (standard on some markets) Braking System: Four-wheel disc brakes (front ventilated) Passive Features Seatbelts: Three-point inertia reel seatbelts (front and rear) Body Structure: Reinforced passenger cell with crumple zones 💡 Technology Features Infotainment Audio System: Factory AM/FM radio with cassette player, optional premium sound systems Climate Control: Manual or optional automatic climate control (ECC - Electronic Climate Control) Driver Assistance Cruise Control: Available as an option Trip Computer: Optional on some models Connectivity Phone Integration: Not applicable for the era 🔧 Maintenance Service Intervals Oil Change Interval: Every 7,500-10,000 miles (12,000-16,000 km) or annually, depending on driving conditions Air Filter Replacement: Every 15,000-30,000 miles (24,000-48,000 km) or as needed based on inspection Spark Plug Replacement: Every 30,000 miles (48,000 km) for...