🏷️ Basic Information Identification Make: BMW Model: 525i Model Designation: E34 Model Year: 1990 Codes Chassis Code: E34 Engine Code: M20B25 👋 Introduction Market Position Segment: Executive sedan, luxury mid-size car. Brand Philosophy: Focus on driving dynamics, build quality, and advanced engineering for its era. Competitive Analysis Competitors 1990: Mercedes-Benz W124 E-Class, Audi V8, Lexus LS 400, Jaguar XJ. Key Features Engineering: Rear-wheel drive platform, sophisticated independent suspension, refined inline-six engine. Design: Chris Bangle's iconic E34 design, blending sportiness with elegance. 📋 Manual Details Coverage Areas General Coverage: Complete factory service and repair for BMW 525i (E34) 1990 model year. Page Count Estimated Page Count: Hundreds of pages (specific number not provided in product info, but implies comprehensive nature). Manual Type Type: Factory Service Repair Manual Language Language: English Format Format: Download PDF 📖 Manual Coverage Systems Covered Engine: Engine mechanical (M20B25 inline-6), lubrication, cooling, fuel delivery, ignition, emission control, engine management (DME). Transmission: Manual and Automatic Transmission service, overhaul, adjustments, and troubleshooting. Drivetrain: Clutch, driveshaft, differential, axles. Suspension: Front and rear suspension systems, components, alignment, shock absorbers, springs. Brakes: Hydraulic brake system, ABS (if equipped), brake pads, rotors, lines, bleeding procedures. Steering: Power steering system, steering gear, linkage, adjustments. Electrical: Wiring diagrams, component testing, battery, alternator, starter, lighting, instrumentation, power windows, locks, mirrors. Body: Body panels, doors, windows, locks, interior trim, bumpers, HVAC system (heating, ventilation, air conditioning). Chassis: Frame, subframes, exhaust system, fuel tank, fuel lines. Procedures Included Maintenance: Scheduled maintenance, fluid changes, filter replacements, spark plug replacement, timing belt inspection/replacement (if applicable to M20). Repair: Detailed step-by-step repair procedures for all major systems, including engine overhaul, transmission rebuild, brake caliper replacement, suspension component replacement, electrical diagnostics and repair. Troubleshooting: Diagnostic flowcharts and symptom-based troubleshooting guides for common and complex issues across all vehicle systems. Diagnostics: In-depth diagnostic procedures for engine management, electrical systems, and mechanical components. Specifications: Torque specifications for all fasteners, tolerances, clearances, fluid capacities, and diagnostic values. Technical Depth Depth: Comprehensive from basic maintenance to full engine and transmission rebuilds. Includes detailed electrical schematics and diagnostic data. 📊 Manual Specifications File Format File Type: PDF Searchability: Likely searchable text content for efficient information retrieval. Print Quality Quality: High-resolution PDF, suitable for printing individual pages or the entire manual. Binding Type Binding: N/A (Digital PDF download) Paper Type Paper Type: N/A (Digital PDF download) ⚙️ Engine Specifications Primary Engine Engine Code: M20B25 Configuration: Inline 6-cylinder Displacement: 2494 cc (2.5 Liters) Bore X Stroke: 84.0 mm x 75.0 mm Compression Ratio: 8.8:1 or 9.0:1 (depending on market/variant) Valvetrain: SOHC (Single Overhead Camshaft), 12 valves (2 valves per cylinder) Performance Horsepower: 168 hp (125 kW) @ 5800 rpm (approx.) Torque: 226 Nm (167 lb-ft) @ 4300 rpm (approx.) Fuel System Fuel Delivery: Bosch Motronic fuel injection (e.g., Motronic ML 3.1) Fuel Type: Unleaded gasoline (RON 91 or higher) Engine Management ECU System: DME (Digital Motor Electronics) 🔧 Transmission Standard Type: Getrag 260 5-speed manual transmission Optional Type: ZF 4HP22 4-speed automatic transmission Features Auto Transmission Control: Electronic control and shift points (for automatic). Clutch Type: Hydraulically operated single dry plate clutch (manual). 📐 Dimensions Exterior Length: 4710 mm (185.4 in) Width: 1751 mm (68.9 in) Height: 1410 mm (55.5 in) Wheelbase: 2797 mm (110.1 in) Weights Curb Weight: 1550-1600 kg (approx.) Gross Vehicle Weight Rating: Not specified in product info. Wheel Bolt Pattern: 5x120 🛡️ Safety Features Ratings Crash Test Results: Information not directly available in product description, but E34 chassis known for robust construction. Active Features ABS: Anti-lock Braking System (ABS) often standard or optional. Traction Control: ASC (Automatic Stability Control) available on some later E34 models, less common for 1990 525i. Passive Features Airbags: Driver airbag typically standard, passenger airbag optional or introduced later in the E34 lifecycle. Seatbelts: Three-point front and rear seatbelts. Construction: Integral safety cage, crumple zones. 💡 Technology Features Infotainment Audio System: Factory cassette player with optional CD changer integration. Premium sound systems (e.g., HiFi) available. Navigation: Early navigation systems (e.g., BMW Navigation) were optional and rudimentary by modern standards. Driver Assistance Cruise Control: Standard electronic cruise control. Parking Assist: Rear parking sensors were not common on 1990 models. Connectivity Phone Integration: Optional cellular phone integration packages were available but basic. 🔧 Maintenance Service Intervals Oil Change: Typically every 10,000-15,000 km (6,000-10,000 miles) or annually, with condition-based service (CBS) indicators becoming more prevalent. Air Filter: Inspect every 30,000 km (18,000 miles), replace as needed or every 60,000 km (36,000 miles). Spark Plugs: Replace every 40,000-60,000 km (25,000-36,000 miles) depending on plug type (e.g., copper vs. platinum). Coolant Flush: Every 2-3 years or 60,000 km (36,000 miles). Transmission Fluid Auto: BMW initially considered automatic transmission fluid 'lifetime,' but extended service life by changing every 80,000-120,000 km (50,000-75,000 miles). Fluid Specifications Engine Oil: API SG or higher, SAE 10W-30 or 10W-40 recommended for most...