🏷️ Basic Information Identification Make: Mercedes-Benz Model: 300E Year: 1990 Codes Chassis Code: W124 👋 Introduction Market Position Segment: Mid-size luxury sedan Competitors 1990: BMW 5 Series (E34), Audi 100/200, Lexus LS400, Cadillac Seville Key Features Build Quality: Exceptional build quality and durability, characteristic of Mercedes-Benz engineering Ride Comfort: Renowned for a comfortable and refined ride, excellent for long-distance cruising Safety: Pioneering safety features for its era, including standard airbags and ABS Engine Performance: Smooth and powerful inline-six engine 📋 Manual Details Coverage Areas Coverage Scope: Comprehensive mechanical and electrical service, repair, and maintenance Page Count Estimated Pages: 1000+ Manual Type Type: Official Factory Service Manual / Repair Manual Language Language: English Format Format: Software (likely PDF or proprietary application) 📖 Manual Coverage Systems Covered Engine Mechanical: Engine disassembly, assembly, diagnosis, timing, lubrication, cooling Fuel System: Fuel injection (Bosch KE-Jetronic), fuel pump, lines, injectors, pressure regulator Ignition System: Ignition coil, distributor, spark plugs, ignition timing, electronic control unit (ECU) Transmission: Automatic transmission (4-speed 4G-TRONIC), torque converter, valve body, clutches, seals, fluid service Drivetrain: Driveshaft, universal joints, rear axle differential, wheel bearings Suspension: Front struts, rear multi-link suspension, springs, shock absorbers, control arms, bushings, anti-roll bars Steering: Power steering system, steering gear, steering column, linkages, fluid service Brakes: Front and rear disc brakes, ABS (Anti-lock Braking System), brake fluid, calipers, pads, rotors, lines Electrical System: Battery, charging system (alternator), starting system (starter motor), wiring diagrams, fuses, relays, lighting Climate Control: Air conditioning (R-134a conversion considerations), heating system, blower motor, HVAC controls Body And Chassis: Body panel removal/installation, door mechanisms, window regulators, locks, body repair specifications Interior: Seat removal, dashboard components, trim panels, instrument cluster Procedures Included Maintenance Schedule: Detailed recommended service intervals for all major components Routine Maintenance: Oil changes, filter replacements, fluid checks and top-offs, lubrication points Diagnostic Procedures: Troubleshooting guides for common and uncommon issues, symptom-based diagnostics Repair Procedures: Step-by-step instructions for component removal, overhaul, and reinstallation Engine Rebuild: Complete engine overhaul procedures, including torque specifications and clearances Transmission Overhaul: Detailed steps for automatic transmission disassembly, repair, and reassembly Electrical Troubleshooting: Wiring diagrams with detailed explanations and diagnostic trees Suspension Alignment: Alignment specifications and procedures Brake Service: Pad and rotor replacement, caliper servicing, ABS component diagnosis Technical Depth Depth: Expert level; covers complete rebuilds, advanced diagnostics, and factory specifications 📊 Manual Specifications File Format File Type: Software, likely searchable PDF or interactive application Print Quality Clarity: High-resolution diagrams and text for easy readability Binding Type Binding: N/A (Software) Paper Type Paper: N/A (Software) ⚙️ Engine Specifications Primary Engine Engine Type: Inline-6, SOHC Engine Code Family: M103 Displacement: 3.0 Liters (2960 cc) Bore X Stroke: 88.5 mm x 80.25 mm Compression Ratio: 9.2:1 Performance Horsepower: 188 hp @ 5700 RPM Torque: 195 lb-ft @ 4400 RPM Fuel System Injection System: Bosch KE-Jetronic Electronic Fuel Injection Fuel Type: Unleaded Gasoline (Premium) Lubrication Oil Capacity: 7.0 Liters (7.4 US Quarts) with filter change Recommended Oil Viscosity: SAE 10W-30 or 10W-40 (API SG or higher) Cooling System Coolant Capacity: 9.5 Liters (10.0 US Quarts) Coolant Type: Mercedes-Benz specification coolant (typically blue) 🔧 Transmission Standard Type: 4-speed Automatic (4G-TRONIC) Optional Type: 5-speed Manual (less common in the US market) Features Torque Converter: Lock-up torque converter for improved fuel efficiency Transmission Fluid Capacity: Approx. 8.0 Liters (8.5 US Quarts) for complete drain and fill Transmission Fluid Type: MB 236.1 approved ATF (e.g., Shell ATF 3403-M115, Dexron III compatible if specified by manufacturer) 📐 Dimensions Exterior Length: 188.4 inches (4785 mm) Width: 69.5 inches (1765 mm) Height: 55.7 inches (1415 mm) Wheelbase: 110.2 inches (2800 mm) Weights Curb Weight: Approx. 3500-3700 lbs (1588-1678 kg) 🛡️ Safety Features Ratings NHTSA Front Impact: 4/5 stars (estimated for the era, comprehensive data may vary) IIHS Side Impact: Good (estimated for the era, comprehensive data may vary) Active Features ABS: Standard Anti-lock Braking System (ABS) Traction Control: Optional Acceleration Skid Control (ASR) on some models Passive Features Airbags: Standard driver's side airbag Seat Belts: Three-point seatbelts with pretensioners Crumple Zones: Advanced crumple zones for enhanced crash protection 💡 Technology Features Infotainment Audio System: Factory installed AM/FM stereo cassette player, optional CD changer Climate Control: Manual or optional automatic climate control (ECC - Electronic Climate Control) Driver Assistance Cruise Control: Standard cruise control Connectivity Telephone: Optional factory installed cellular telephone (dated technology) 🔧 Maintenance Service Intervals Oil Change Interval: Every 7,500 miles (12,000 km) or 12 months, whichever comes first Air Filter Replacement: Every 15,000 miles (24,000 km) Spark Plug Replacement: Every 30,000 miles (48,000 km) Transmission Fluid Service: Every 30,000 miles (48,000 km) or 24 months Coolant Flush: Every 30,000 miles (48,000 km) or 24 months Fluid Specifications Power Steering Fluid: MB spec 236.3 approved hydraulic fluid Brake Fluid: DOT 3 or DOT 4 brake fluid Known Issues Wiring Harness: Cracking and degradation of engine wiring harness insulation (biodegradable insulation...