🏷️ Basic Information Identification Make: BMW Model: 5-Series Chassis Code: E28 Specific Model: 525i Production Years Covered: 1981-1988 Codes Engine Code Example: M30B25 👋 Introduction Market Position Era Positioning: Represents BMW's mid-size executive sedan offering in the 1980s, known for sporty handling and luxury appointments. Competitive Analysis Competitors: Mercedes-Benz W124 E-Class, Audi 100/200, Jaguar XJ Series, Volvo 700 Series. Key Features Design Philosophy: Iconic 'Hofmeister kink' on the C-pillar, balanced weight distribution, driver-focused interior. Technical Highlights: Sophisticated independent suspension, robust inline-six engines, rear-wheel drive. Manual Value Proposition Value: An indispensable tool for maintaining and repairing the classic BMW E28 525i, providing factory-accurate information to preserve its performance and longevity. 📋 Manual Details Coverage Areas Primary Coverage: Service and Repair Scope: Complete Factory Service Manual Page Count Page Count Estimate: Estimated 1000+ pages (typical for this era's comprehensive manuals) Manual Type Type: Workshop Repair Manual Language Language: English Format Format: PDF 📖 Manual Coverage Systems Covered Powertrain: Engine, Fuel System, Cooling System, Lubrication System, Exhaust System Chassis: Suspension (Front & Rear), Steering System, Braking System, Drivetrain (Driveshafts, Differential) Electrical: Lighting, Instrumentation, Ignition System, Charging System, Starting System, Body Electrics, ECU Diagnostics Body And Interior: Body Panels, Doors, Glass, Seats, Trim, HVAC System Emissions: Emission Control Systems and Information Procedures Included Maintenance: Periodic Maintenance, Fluid Changes, Filter Replacements, Inspections Repair: Component Disassembly, Reassembly, Adjustment, Replacement Troubleshooting: Diagnostic Procedures, Fault Finding Charts, Symptom-Based Troubleshooting Wiring Diagrams: Detailed Electrical Schematics Technical Depth Depth: Comprehensive (from basic maintenance to complete engine/transmission rebuilds) Target Audience Audience: Do-It-Yourselfers and Professional Mechanics 📊 Manual Specifications File Format File Type: PDF Print Quality Printability: Printable without restriction Binding Type Binding Type: Digital Download (PDF) Paper Type Digital Format Details: High-quality diagrams and easy-to-read text sections Requirements Software Requirement: Adobe PDF Reader Delivery Delivery Method: Instant Download ⚙️ Engine Specifications Primary Engine Engine Type: Inline 6-cylinder, Naturally Aspirated Engine Code: M30B25 (most common for 525i in this period) Displacement: 2494 cc (2.5 Liters) Performance Horsepower Estimate: Approximately 150-170 hp (depending on market and specific tune) Torque Estimate: Approximately 205-210 Nm (151-155 lb-ft) Fuel System Fuel Delivery: Bosch L-Jetronic or Motronic Fuel Injection Fuel Type: Unleaded Gasoline (Premium) Cooling System Cooling Type: Water-cooled Lubrication System Oil Type Recommendation: Refer to manual for specific viscosity grades (e.g., 20W-50, 10W-40 depending on climate) Engine Management Ignition System: Electronic Ignition (e.g., Hall Effect Sensor, Distributer) 🔧 Transmission Standard Type: 4-Speed Manual (Getrag 260/5 or similar) or 3-Speed Automatic (ZF 3HP22) Optional Type: 5-Speed Manual (Getrag 260/5) Features Clutch Type: Single dry plate, hydraulically operated Fluid Specifications Manual Transmission Fluid: Refer to manual for specific gear oil (e.g., GL-4 specification) Automatic Transmission Fluid: Refer to manual for specific ATF type (e.g., Dexron III or equivalent) 📐 Dimensions Exterior Length Approx: 4700-4750 mm (185-187 in) Width Approx: 1700-1720 mm (67-68 in) Height Approx: 1400-1420 mm (55-56 in) Weights Curb Weight Approx: 1350-1450 kg (2976-3197 lbs) Gross Vehicle Weight Rating Approx: 1850-1950 kg (4079-4299 lbs) Cargo Trunk Capacity Approx: 450-470 Liters (16-17 cu ft) 🛡️ Safety Features Ratings Crash Test Era: Pre-modern crash test standards; focus on passive safety design. Active Features Braking System: Front Ventilated Disc Brakes, Rear Solid Disc Brakes Anti Lock Brakes: Optional ABS (Anti-lock Braking System) on later models. Passive Features Airbags: No factory-installed airbags on early models; optional driver airbag available on later E28s. Seat Belts: Three-point seat belts in front and rear Body Structure: Reinforced safety cage, crumple zones. 💡 Technology Features Infotainment Audio System: Optional AM/FM radio with cassette player. Aftermarket upgrades are common. Driver Assistance Cruise Control: Optional on some models. Comfort Features Climate Control: Manual or optional automatic climate control (ECC - Electronic Climate Control). 🔧 Maintenance Service Intervals Oil Change Interval: Typically every 5,000-7,500 miles or 6-12 months, depending on driving conditions. Spark Plug Replacement Interval: Refer to manual; often around 30,000 miles for standard plugs. Timing Belt Chain: M30 engines use a timing chain, requiring inspection but generally not replacement unless worn. Fluid Specifications Coolant Type: Ethylene Glycol based antifreeze (blue or green, BMW specific recommended) Brake Fluid Type: DOT 3 or DOT 4 Power Steering Fluid Type: Refer to manual; typically ATF or Pentosin CHF 11S for later models. Known Issues Common Problems: Cooling system leaks (radiator, hoses, water pump), fuel injector issues, front suspension wear (bushings, ball joints), fuel pump failure, rust (wheel wells, rockers). Electrical Gremlins: Frayed wiring harnesses, failing relays, instrument cluster issues are not uncommon in older vehicles. Maintenance Tips Preventative Maintenance: Regularly check and replace coolant hoses, inspect the fuel system for leaks, and maintain proper cooling system pressure. 📚 Vehicle History Brand Heritage Bmw Philosophy: BMW's reputation for building the 'Ultimate Driving Machine' solidified with the E28 generation. Model Evolution Predecessor: E12 5-Series Successor: E34 5-Series Production Manufacturing Locations: Germany (Dingolfing), South Africa, and assembly in other countries. Production...