🏷️ Basic Information Identification Make: BMW Model: 5-Series Chassis Code: E28 Specific Model: 525i Production Years Covered: 1981-1988 Codes Engine Code Primary: M30B25 👋 Introduction Market Position Segment: Luxury Executive Sedan Target Audience: BMW owners, independent repair shops, DIY enthusiasts. Competitive Analysis Competitors: Mercedes-Benz W123/W124, Audi 100/200, Volvo 700 Series, Jaguar XJ. Key Features Vehicle Design Philosophy: BMW's signature blend of performance, luxury, and engineering prowess. Key Features Manual Value Proposition: Empowers owners with factory-level repair knowledge, saving time and money. User Experience: Easy-to-navigate PDF format with printable pages for workshop use. 📋 Manual Details Coverage Areas Manual Type: Complete Official Full Service Repair Manual Language: English Coverage Scope: All models and all repairs A-Z Page Count Page Count: Not specified, but implied to be comprehensive. Format File Format: PDF Delivery Method: Instant Download Requirements Software Requirements: Adobe PDF Reader & WinZip Compatibility: All Versions of Windows & Mac 📖 Manual Coverage Systems Covered Engine Mechanical: Detailed instructions for engine repair, overhaul, timing, valve adjustments, and component replacement. Fuel System: Diagnosis and repair of fuel injection systems (Bosch L-Jetronic/Motronic), fuel pumps, lines, filters, and injectors. Ignition System: Information on ignition timing, spark plugs, ignition coils, distributors, and electronic ignition control. Cooling System: Radiator, water pump, thermostat, hoses, coolant specifications, and fan operation. Exhaust System: Catalytic converter, muffler, exhaust manifold, and pipe inspection and replacement. Transmission Manual: Overhaul, clutch replacement, gear linkage, and fluid specifications for manual transmissions. Transmission Automatic: Diagnosis, fluid service, seal replacement, and troubleshooting for automatic transmissions. Drivetrain: Driveshaft, universal joints, differential, axle shafts, and bearing service. Suspension: Front and rear suspension components, shock absorbers, struts, control arms, ball joints, and bushings. Steering System: Power steering pump, steering rack, tie rods, and hydraulic fluid. Brake System: Disc brake systems (front and rear), calipers, pads, rotors, master cylinder, brake lines, and parking brake. Electrical System: Battery, alternator, starter motor, wiring harnesses, fuses, relays, and electrical component testing. Lighting System: Headlights, taillights, interior lights, and bulb specifications. Instrumentation And Controls: Dashboard gauges, warning lights, switches, and climate control system. Body And Chassis: Body panels, doors, hinges, latches, trim, and structural components. Interior: Seats, carpets, headliner, and interior trim panel removal and installation. HVAC System: Heating, ventilation, and air conditioning system diagnosis and repair. Diagnostic Procedures: Troubleshooting guides for common problems, error code interpretation (where applicable), and diagnostic testing. Procedures Included Routine Maintenance: Oil changes, filter replacements, fluid checks, tire rotations, and spark plug changes. Component Replacement: Step-by-step instructions for replacing all major and minor vehicle components. Overhaul And Rebuild: Detailed procedures for overhauling engines, transmissions, and other major assemblies. Troubleshooting Guides: Systematic approaches to diagnosing and resolving a wide range of vehicle issues. Wiring Schematics: Complete electrical wiring diagrams for all vehicle systems. Technical Specifications: Detailed torque values, clearances, fluid capacities, and other critical measurements. Technical Depth Depth Of Coverage: Factory authorized, dealership-level repair and diagnostic information. Detail Level: Comprehensive, step-by-step instructions with detailed diagrams and illustrations. 📊 Manual Specifications File Format Digital Format: PDF Print Quality Printability: Fully printable, allowing users to print only necessary pages. Zoom Capability: YES (Zoom In/Out for detailed image viewing and printing) Binding Type Binding: N/A (Digital PDF format) Paper Type Paper Type: N/A (Digital PDF format) ⚙️ Engine Specifications Primary Engine Engine Type: Inline 6-cylinder, SOHC (M30 engine family) Displacement: 2494 cc (2.5 Liters) Bore X Stroke: 84.0 mm x 90.0 mm Compression Ratio: 8.8:1 (typical) Performance Horsepower: Approx. 150-155 PS (148-153 bhp) @ 5500-6000 rpm (depending on market and year) Torque: Approx. 225 Nm (166 lb-ft) @ 3500-4000 rpm (depending on market and year) Fuel System Fuel Delivery: Bosch L-Jetronic or Motronic electronic fuel injection Fuel Type: Unleaded gasoline (premium recommended) Cooling System Cooling Type: Water-cooled 🔧 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 operated single dry plate clutch (manual) Transmission Fluid Spec Manual: API GL-4 or GL-5, SAE 75W-90 or 80W-90 gear oil (check manual for specific OEM recommendation) Transmission Fluid Spec Automatic: BMW ATF DII or equivalent (check manual for specific OEM recommendation) 📐 Dimensions Exterior Length: Approx. 4700-4750 mm (185-187 in) Width: Approx. 1700 mm (66.9 in) Height: Approx. 1410 mm (55.5 in) Weights Curb Weight: Approx. 1450-1550 kg (3197-3417 lbs), depending on transmission and options Gross Vehicle Weight Rating: Not specified, but would be available in the manual. 🛡️ Safety Features Ratings Crash Test Results: While official NCAP ratings for this era are limited, the E28 was known for its robust chassis and safety features for its time. Active Features Brakes: Standard front ventilated discs, rear solid discs; ABS optional on later models. Passive Features Seatbelts: Three-point inertia-reel seatbelts Chassis Design: Reinforced passenger safety cell, crumple zones. 💡 Technology Features Infotainment Audio System: Original units likely featured analog radios, cassette players, and...