🏷️ Basic Information Identification Make: BMW Model: 5-Series Model Code: E28 Specific Model: 525i Production Years: 1981-1988 📋 Manual Details Coverage Areas Coverage Scope: Full Service and Repair Diagnostic Procedures: Included Troubleshooting: Included Maintenance Schedules: Included Disassembly Assembly: Complete Page Count Page Count: Not specified (but comprehensive) Manual Type Manual Type: Professional Technical Manual / Shop Manual Target Audience: DIY and Experienced Mechanics Language Language: English Format File Format: PDF Printability: Full Printable Interactivity: Zoom IN/OUT Delivery Delivery Method: Instant Download Requirements Software Requirements: Adobe PDF Reader & WinZip Operating System Compatibility: All Versions of Windows & Mac ⚙️ Engine Specifications Primary Engine Engine Type: Inline 6-cylinder Displacement: 2.5 Liters (2494 cc) Engine Code: M30B25 Valvetrain: SOHC Bore: 84 mm Stroke: 75 mm Compression Ratio: 8.8:1 (typical) Performance Horsepower: 150 hp (112 kW) at 5500 rpm (approx.) Torque: 215 Nm (159 lb-ft) at 3500 rpm (approx.) Fuel System Fuel Delivery: Bosch L-Jetronic Fuel Injection Fuel Type: Unleaded Gasoline (Octane rating as per manual) 🔧 Transmission Standard Standard Transmission: 4-speed Manual Optional Optional Transmission: 3-speed Automatic (ZF 3HP22) Features Clutch Type: Single dry plate, hydraulic actuation 📐 Dimensions Exterior Body Styles: 4-door Sedan Length: 4725 mm (186.0 in) Width: 1700 mm (66.9 in) Height: 1415 mm (55.7 in) Wheelbase: 2795 mm (110.0 in) Weights Curb Weight: 1420 kg (3131 lbs) (approx.) 🛡️ Safety Features Ratings Crash Test Ratings: Not applicable for era Features Brakes: Front Ventilated Discs, Rear Solid Discs Anti Lock Braking System: Optional on later models Seatbelts: 3-point front, 2-point rear (typical for era) Steering: Power-assisted recirculating ball Suspension Front: MacPherson struts, independent Suspension Rear: Semi-trailing arms, independent 🔧 Maintenance Service Intervals Oil Change Interval: Refer to manual (typically 5,000-7,500 miles or 6-12 months) Spark Plug Replacement: Refer to manual Timing Belt Replacement: Not applicable (timing chain) Fluid Specifications Engine Oil Type: Refer to manual (e.g., BMW High Performance 20W-50 or equivalent) Coolant Type: Ethylene Glycol based coolant (BMW approved type) Brake Fluid Type: DOT 3 or DOT 4 Transmission Fluid Type Manual: GL-4 gear oil (e.g., SAE 75W-90) Transmission Fluid Type Automatic: Dexron III or equivalent