🏷️ Basic Information Identification Make: BMW Model: 525i Model Code: E28 Year: 1984 Codes Engine Code Primary: M30B25 👋 Introduction Market Position Segment: Executive Sedan Target Audience: Enthusiasts, DIY mechanics, professional service technicians working on vintage BMWs. Competitive Analysis Competitors 1984: Mercedes-Benz W124 E-Class, Audi 100, Jaguar XJ6 Key Features Vehicle Handling: Renowned for its balanced chassis and precise steering. Engine Smoothness: M30 inline-six engine known for its refinement and durability. Key Features Manual Value Proposition: Empowers owners to maintain and repair their classic BMW, preserving its performance and value. 📋 Manual Details Coverage Areas Engine: Yes Transmission: Yes Brakes: Yes Suspension: Yes Electrical System: Yes Bodywork: Yes Interior: Yes Troubleshooting: Yes Maintenance: Yes Diagnostics: Yes Page Count Estimated Pages: High (likely 500+ pages for a comprehensive workshop manual) Manual Type Type: Workshop Repair Service Manual Language Language: English Format Format: PDF Download 📖 Manual Coverage Systems Covered Engine Management: Fuel injection (Bosch L-Jetronic/Motronic), ignition timing, emission controls Cooling System: Radiator, water pump, thermostat, hoses, fan clutch Lubrication System: Oil pump, oil filter, oil cooler, lubrication passages Fuel System: Fuel tank, fuel pump, fuel lines, injectors, pressure regulator Exhaust System: Exhaust manifold, catalytic converter, mufflers, pipes Drivetrain: Driveshaft, universal joints, differential, axles Steering: Power steering system, steering rack, steering column Chassis Frame: Frame construction, mounting points Climate Control: HVAC system, blower motor, A/C compressor, heater core Lighting System: Headlights, taillights, interior lights, wiring diagrams Instrumentation: Gauges, warning lights, sensors Procedures Included Engine Overhaul: Complete engine rebuild, including piston, ring, bearing, and cylinder head service Transmission Repair: Automatic and manual transmission disassembly, assembly, and adjustment Brake Service: Brake pad and rotor replacement, caliper rebuilding, hydraulic system bleeding Suspension Geometry: Alignment procedures, shock absorber and strut replacement Electrical Troubleshooting: Wiring diagrams for all circuits, diagnostic procedures for electrical faults Body Panel Replacement: Front fenders, doors, hood, trunk lid removal and installation Air Conditioning Service: Refrigerant system charging, leak detection, component replacement Fuel System Diagnostics: Fuel pressure testing, injector cleaning and testing Ignition System Service: Spark plug replacement, distributor service, ignition coil testing Technical Depth Depth: Comprehensive: Covers routine maintenance to complete engine and transmission rebuilds, including detailed diagnostics and repair procedures. 📊 Manual Specifications File Format Quality: High-resolution, searchable PDF Printable: Yes, optimized for printing individual pages or sections. Binding Type Type: N/A (Digital PDF Download) Paper Type Type: N/A (Digital PDF Download) ⚙️ Engine Specifications Primary Engine Engine Type: Inline-6 Cylinder, SOHC Engine Code: M30B25 Displacement: 2494 cc (2.5 Liters) Performance Horsepower: Approx. 150 hp @ 5500 rpm (varies slightly by market and specific tuning) Torque: Approx. 205 Nm (151 lb-ft) @ 3500 rpm Fuel System Fuel Injection: Bosch L-Jetronic or Motronic (depending on specific production date/market) Fuel Type: Unleaded gasoline Cooling System Coolant Capacity: Approx. 8.5 Liters (8.9 US Quarts) Lubrication System Oil Capacity: Approx. 5.0 Liters (5.3 US Quarts) with filter change Oil Specification: SAE 20W-50 or 15W-40 (check manual for precise year/climate recommendations) 🔧 Transmission Standard Type: 4-speed manual transmission (Getrag 260/5) Optional Type: 3-speed ZF 4HP22 automatic transmission Features Clutch: Hydraulically actuated single dry plate clutch Automatic Features: Torque converter lock-up in higher gears Fluid Specification Manual Transmission Fluid: SAE 75W-90 or 75W-80 GL-4 gear oil Automatic Transmission Fluid: Dexron II or equivalent 📐 Dimensions Exterior Length: 4755 mm (187.2 in) Width: 1700 mm (66.9 in) Height: 1410 mm (55.5 in) Weights Curb Weight: Approx. 1450 kg (3197 lbs) Gross Vehicle Weight Rating: Approx. 1950 kg (4300 lbs) 🛡️ Safety Features Ratings Crash Test Data: Limited data available for this era, but known for robust construction. Active Features ABS: Optional anti-lock braking system (ABS) available on some models. Passive Features Seatbelts: Three-point inertia-reel seatbelts Structure: Reinforced passenger cell, crumple zones Steering Column: Energy-absorbing steering column 💡 Technology Features Infotainment Audio System: Original BMW Bavaria C or optional Blaupunkt/Alpine cassette radios. Typically 4-6 speakers. Air Conditioning: Manual climate control, often with optional automatic climate control on higher trims. Driver Assistance Cruise Control: Optional cruise control system available. Connectivity Diagnostic Ports: Limited electronic diagnostics compared to modern vehicles. Troubleshooting relies heavily on mechanical understanding and basic electrical testers. 🔧 Maintenance Service Intervals Oil Change: Typically every 10,000-15,000 km (6,000-10,000 miles) or annually, whichever comes first. Consult manual for precise intervals. Spark Plugs: Every 30,000-40,000 km (20,000-25,000 miles). Check specific plug type and gap. Brake Fluid: Every 2 years or 30,000 km (20,000 miles). Coolant Flush: Every 2-3 years. Fluid Specifications Power Steering Fluid: ATF Dexron II or BMW-approved equivalent. Brake Fluid Type: DOT 3 or DOT 4 Known Issues Common Problems Engine: Oil leaks (valve cover gasket, oil pan gasket), coolant leaks (hose failures, water pump seal), ignition component degradation. Common Problems Suspension: Worn control arm bushings, ball joints, strut mounts leading to sloppy handling and noise. Common Problems Electrical: Degrading wiring insulation, faulty fuel pump relays, alternator issues,...