🏷️ Basic Information Identification Make: BMW Model: 325i Year: 1990 Codes Chassis Code: E30 Engine Code Lookup: M20B25 👋 Introduction Market Position Segment: Compact Executive Sedan/Coupe Target Audience: Enthusiasts, DIY mechanics, professional workshops specializing in BMWs Competitive Analysis Competitors 1990: Mercedes-Benz 190E, Audi 90, Acura Legend, Lexus ES250 Key Features Vehicle Selling Points: Sporty handling, refined engine, build quality, iconic design Manual Value Proposition Value: Enables owners and technicians to perform accurate diagnostics, maintenance, and repairs, maximizing the lifespan and performance of the vehicle. 📋 Manual Details Coverage Areas Primary Coverage: Service and Repair Secondary Coverage: Maintenance, Troubleshooting, Diagnostics, Overhaul Page Count Estimated Pages: Hundreds (typical for comprehensive workshop manuals) Manual Type Type: Workshop Manual / Service Manual Language Language: English Format Format: Digital (likely PDF, searchable) 📖 Manual Coverage Systems Covered Powertrain: Engine, Fuel System, Ignition System, Exhaust System, Cooling System, Lubrication System, Transmission (Manual & Automatic) Chassis: Suspension (Front & Rear), Steering System, Brakes (Hydraulic & Parking), Drivetrain (Driveshafts, Differential) Electrical: Wiring Diagrams, Lighting System, Instrumentation, Power Accessories, Battery, Alternator, Starter Motor, Engine Control Unit (ECU) Body And Interior: Body Panels, Doors, Windows, Seats, HVAC System, Interior Trim, Safety Systems (Seatbelts, Airbags - if applicable for '90 models) Procedures Included Maintenance: Scheduled Maintenance, Fluid Changes, Filter Replacements, Tune-ups Repair: Component Removal and Installation, Overhaul Procedures, Component Reassembly Diagnostics: Troubleshooting Guides, Symptom-Based Diagnosis, Fault Code Interpretation (OBD-I) Specifications: Torque Values, Clearances, Alignment Settings, Electrical Resistances Technical Depth Depth: Comprehensive: Covers routine maintenance, intermediate repairs, and major overhauls, suitable for professional technicians and advanced DIYers. 📊 Manual Specifications File Format Format: PDF (typically optimized for digital viewing and printing) Searchability: Text-searchable (allows for quick finding of specific topics and terms) Print Quality Quality: High Resolution (ensures clarity of diagrams, schematics, and text) Binding Type Binding: N/A (Digital) Paper Type Type: N/A (Digital) ⚙️ Engine Specifications Primary Engine Engine Type: Inline-6 Cylinder, DOHC (Double Overhead Camshaft) Engine Code: M20B25 Displacement: 2494 cc (2.5 Liters) Bore X Stroke: 84 mm x 75 mm Compression Ratio: 8.5:1 or 9.7:1 (depending on market/variant) Performance Horsepower Hp: 168 hp @ 5800 rpm (approx.) Torque Lb-Ft: 164 lb-ft @ 4500 rpm (approx.) Fuel System Fuel Delivery: Bosch Motronic Electronic Fuel Injection (EFI) Fuel Type: Unleaded Gasoline (RON 91 or higher recommended) Ignition System Ignition Type: Electronic Ignition with Knock Sensor Cooling System Coolant Type: BMW Blue Antifreeze/Coolant (G48, or equivalent ethylene glycol with corrosion inhibitors) Coolant Capacity: Approx. 7.5 Liters Lubrication System Oil Type: SAE 15W-40 or 15W-50 (check owner's manual for specific recommendations based on climate) Oil Capacity: Approx. 4.25 Liters (with filter) Oil Filter Part Number Example: Mann-Filter W940/1, Bosch 3323 🔧 Transmission Standard Type: Getrag 260 5-Speed Manual Transmission Optional Type: ZF 4HP22 4-Speed Automatic Transmission Features Manual Gear Ratios Example: 1st: 4.01, 2nd: 2.19, 3rd: 1.42, 4th: 1.00, 5th: 0.81, Reverse: 3.75 Automatic Features: Lock-up torque converter, electronic control (ECU) Fluid Specifications Manual Fluid Type: ATF Dexron III (or equivalent, e.g., Pentosin ATF-1) Automatic Fluid Type: ATF Dexron III (or equivalent) 📐 Dimensions Exterior Length: Approx. 4415 mm (173.8 in) Width: Approx. 1675 mm (65.9 in) Height: Approx. 1380 mm (54.3 in) Wheelbase: Approx. 2570 mm (101.2 in) Weights Curb Weight: Approx. 1300-1400 kg (2866-3086 lbs) depending on transmission and options Wheels And Tires Standard Wheel Size: 15-inch alloy wheels Standard Tire Size: 205/60VR15 Bolt Pattern: 5x120 mm Center Bore: 72.5 mm 🛡️ Safety Features Ratings NHTSA Ratings: Not explicitly rated under modern NHTSA standards for this era, but E30 models were known for robust construction. Active Features Braking System: Front: Ventilated Discs, Rear: Solid Discs ABS: Optional (Anti-lock Braking System) Passive Features Seatbelts: Three-point front and rear seatbelts Airbags: Driver's side airbag was becoming available on newer E30 models, may be present on late '90 production. Structural Reinforcement: Reinforced safety cage, crumple zones 💡 Technology Features Infotainment Audio System: Factory AM/FM Cassette Player with optional CD changer interface. Onboard Computer: Optional BMW On-Board Computer (OBC) displaying fuel economy, range, and diagnostics. Driver Assistance Cruise Control: Optional Connectivity Connectivity Features: None (pre-dates modern Bluetooth or USB connectivity). 🔧 Maintenance Service Intervals Oil Change: Every 5,000-7,500 miles (8,000-12,000 km) or annually, whichever comes first. Air Filter Replacement: Every 15,000-20,000 miles (24,000-32,000 km). Spark Plug Replacement: Every 30,000 miles (48,000 km) for standard plugs, or longer for platinum/iridium types if retrofitted. Coolant Flush: Every 2-3 years or 30,000-50,000 miles (48,000-80,000 km). Fluid Specifications Brake Fluid Type: DOT 4 Power Steering Fluid Type: ATF Dexron III (or Pentosin CHF 11S - verify specific system) Known Issues Engine Related: Oil leaks from valve cover and oil pan gaskets, fuel distributor issues (Bosch CIS-E), timing belt degradation (if applicable to later M20 variants, though typically chain driven), idle control valve issues. Chassis Related: Subframe mounting point rust, trailing arm bushings, shock mount failure, heater core leaks. Electrical...