🏷️ Basic Information Identification Make: BMW Model: 325i Model Variant: 325 Year: 1990 Codes Chassis Code: E30 👋 Introduction Market Position Era: Late 1980s / Early 1990s performance sedan Segment: Compact Executive/Sports Sedan Competitive Analysis Competitors: Mercedes-Benz W201 (190E), Audi 80/90, Alfa Romeo 75, Acura Legend (early models) Key Features Driving Dynamics: Renowned for balanced chassis, RWD handling, driver engagement Powertrain: Smooth and responsive M20 inline-six engine Design: Iconic E30 design, subtle yet sporting aesthetics 📋 Manual Details Coverage Areas Primary Coverage: Complete factory service and repair Secondary Coverage: Maintenance, troubleshooting, diagnostics, repair procedures, electrical diagrams, specifications Page Count Estimated Page Count: Hundreds (specific number not provided in product info, but implies a comprehensive manual) Manual Type Type: Factory Service Repair Manual Language Language: English Format Format: Downloadable PDF 📖 Manual Coverage Systems Covered Engine: M20B25 inline-six, engine management, fuel injection (Bosch Motronic), ignition, cooling, lubrication, exhaust Transmission: Getrag 260 5-speed manual, ZF 4HP22 4-speed automatic, clutch system, driveshaft, differential Drivetrain: Rear-wheel drive (RWD), axle shafts, wheel bearings Suspension: Front MacPherson struts, rear semi-trailing arms, springs, shock absorbers, bushings, anti-roll bars Steering: Recirculating ball power steering system, steering column, tie rods Brakes: Front vented discs, rear solid discs, hydraulic system, ABS (Anti-lock Braking System) components and diagnostics Electrical: Full wiring diagrams, battery, alternator, starter, lighting system, fuse box, relays, body electronics, instrument cluster Bodywork: Body panel removal and installation, interior trim, exterior trim, glass, seals, bumpers Heating And Air Conditioning: HVAC system, blower motor, evaporator, condenser, refrigerant system, climate controls Procedures Included Maintenance: Scheduled maintenance, oil changes, filter replacements, spark plugs, timing belts (if applicable to M20 - typically chain driven), coolant flushes Troubleshooting: Diagnostic flowcharts for common issues, symptom-based diagnosis Repair: Detailed step-by-step instructions for component removal, disassembly, repair, reassembly, and installation Diagnostics: On-board diagnostics (OBD-I) procedures, fault code retrieval and interpretation for Motronic system Adjustments: Valve clearance adjustments, idle speed control, timing adjustments (if applicable) Technical Depth Depth: Comprehensive, from basic fluid checks to complete engine and transmission rebuilds, in-depth electrical system analysis 📊 Manual Specifications File Format File Type: PDF Print Quality Quality: High-resolution, printable pages Binding Type Binding: N/A (Downloadable PDF, user prints and binds) Paper Type Paper Recommendation: Standard printer paper (user dependent) ⚙️ Engine Specifications Primary Engine Engine Code: M20B25 Configuration: Inline 6-cylinder, SOHC Displacement: 2.5 Liters (2494 cc) Performance Horsepower: 168 hp @ 5800 rpm (approx.) Torque: 164 lb-ft @ 4750 rpm (approx.) Fuel System Injection Type: Bosch Motronic ML-1.3 electronic fuel injection Fuel Type: Unleaded gasoline, 91-93 octane recommended Ignition System Type: Distributorless ignition system (DIS) via Motronic Cooling System Type: Pressurized liquid cooling system Lubrication System Type: Wet sump lubrication system Timing Drive: Timing chain 🔧 Transmission Standard Type: Getrag 260 5-speed manual Optional Type: ZF 4HP22 4-speed automatic Features Clutch: Hydraulically actuated single dry plate clutch (manual transmission) Fluid Manual: BMW recommends MTF LT-2 or equivalent API GL-4 SAE 75W-90 (check manual for specific PN) Fluid Automatic: ATF Dexron III or equivalent (check manual for specific PN) 📐 Dimensions Exterior Wheelbase: 100.1 inches (2543 mm) Length: 170.5 inches (4331 mm) Width: 66.7 inches (1694 mm) Height: 54.2 inches (1377 mm) Weights Curb Weight Manual: 2900-3000 lbs (approx.) Curb Weight Automatic: 2950-3050 lbs (approx.) 🛡️ Safety Features Ratings NHTSA Frontal Impact: Not rated under modern standards (vehicle predates comprehensive NHTSA testing regimes) Active Features ABS: Standard Anti-lock Braking System (ABS) Traction Control: Optional (ASC - Automatic Stability Control) on some later E30 models, less common on 1990 325i Passive Features Airbags: Driver-side airbag standard for 1990 model year Seatbelts: 3-point inertia reel seatbelts front and rear Body Structure: Reinforced chassis and safety cage construction 💡 Technology Features Infotainment Radio: Factory AM/FM cassette player (e.g., Bavaria C or similar) with optional CD changer Speakers: Typically 4-6 speakers Driver Assistance Cruise Control: Optional Connectivity Diagnostics: OBD-I diagnostic port for engine management system (Motronic) 🔧 Maintenance Service Intervals Oil Change: Every 5,000-7,500 miles or annually, whichever comes first (depending on driving conditions) Coolant Flush: Every 2-3 years or 30,000 miles Transmission Fluid: Manual: Check for leaks, change as per manual (often longer intervals). Automatic: Every 30,000-60,000 miles. Spark Plugs: Every 30,000-60,000 miles (depending on plug type) Fluid Specifications Engine Oil: API SG or higher, SAE 10W-40 or 15W-50 (check manual for exact BMW specification) Coolant: BMW Blue Antifreeze/Coolant (G48) or equivalent, mixed 50/50 with distilled water Brake Fluid: DOT 3 or DOT 4 (check manual for specific recommendation), flush every 2 years Known Issues Cooling System: Cracked plastic expansion tanks, failing water pumps, radiator leaks Fuel System: Leaking fuel injectors, failing fuel pump, clogged fuel filter Electrical: Wiring harness degradation (especially around engine bay), alternator issues, starter motor failure, instrument cluster board issues Suspension: Worn bushings (control arm, trailing arm), worn shock absorbers, strut mount failure Engine: Head gasket leaks (less common on M20...