🏷️ Basic Information Identification Make: Mercedes-Benz Model: 300 E Trim: 4MATIC Model Years: 1990-1993 Codes Chassis Code: W124 Engine Code: M103.980 👋 Introduction Market Position Positioning: The Mercedes-Benz 300 E 4MATIC (W124 chassis) represented the pinnacle of engineering and luxury in its segment during the late 1980s and early 1990s. It was positioned as a premium, technologically advanced, and durable sedan offering refined performance and exceptional build quality. Competitive Analysis Competitors: Competed with other luxury sedans of the era, including BMW 5-Series, Audi V8 Quattro, and higher-end models from Jaguar and Lexus. Key Features Salient Features: Permanent four-wheel drive (4MATIC), robust inline-6 engine, legendary W124 chassis durability, sophisticated build, and comfortable ride. 📋 Manual Details Coverage Areas Coverage: Comprehensive service, repair, and maintenance Page Count Page Count: Estimated 1500+ pages (typical for full workshop manuals of this era) Manual Type Manual Type: Factory-authorized Service/Repair Manual Language Language: English Format Format: Digital (PDF), often searchable 📖 Manual Coverage Systems Covered Engine Systems: Engine mechanical (M103 3.0L inline-6), fuel injection (Bosch KE-Jetronic/CIS-E), ignition, cooling, lubrication, exhaust Transmission Systems: 4-speed automatic transmission (722.4) operation, diagnosis, and repair; 4MATIC all-wheel drive system Drivetrain Systems: Front and rear differentials, driveshafts, CV joints, 4MATIC system components Suspension Steering: Front and rear suspension components, shocks, springs, control arms, bushings, steering gear, power steering system Brake Systems: Hydraulic brake system, ABS (Anti-lock Braking System), front and rear brake assembly, parking brake Electrical Systems: Complete wiring diagrams, component testing, battery, alternator, starter, lighting, fuses, relays, instrumentation, control modules Body Chassis: Body panels, doors, windows, locks, convertible top mechanisms (if applicable to specific sub-models not mentioned), frame structure, seals HVAC Systems: Heating, ventilation, and air conditioning (HVAC) system diagnosis and repair Procedures Included Maintenance Procedures: Scheduled maintenance intervals, oil changes, filter replacements, spark plug service, coolant flushes, belt replacements Diagnostic Procedures: Troubleshooting guides, symptom-based diagnostics, diagnostic trouble codes (DTCs) and their interpretation Repair Procedures: Step-by-step instructions for component removal, installation, overhaul, and rebuilding Rebuilding Procedures: Detailed instructions for engine, transmission, and differential rebuilding Adjustment Procedures: Valve adjustments, timing adjustments, idle speed adjustments Installation Procedures: Installation of accessories, replacement parts Technical Depth Depth: Factory-level diagnostic and repair procedures, including torque specifications, tolerances, and special tool requirements 📊 Manual Specifications File Format File Format Details: Digital PDF, typically with text search functionality for easy navigation Print Quality Print Quality: High-resolution scans of original factory manuals, ensuring clarity of diagrams and text Binding Type Binding Type: Not applicable for digital format; if printed, likely a robust comb or perfect binding Paper Type Paper Type: Not applicable for digital format; original manuals used durable paper stock suitable for workshop environments ⚙️ Engine Specifications Primary Engine Engine Type: Naturally Aspirated Inline 6-Cylinder Displacement: 2.96 L (180.7 cu in) Bore X Stroke: 89.9 mm x 78.6 mm (3.54 in x 3.09 in) Compression Ratio: 9.2:1 Valve Train: SOHC (Single Overhead Camshaft), 2 valves per cylinder Performance Horsepower: 188 hp @ 5700 rpm (approx.) Torque: 195 lb-ft @ 4400 rpm (approx.) Fuel System Fuel Injection System: Bosch KE-Jetronic (CIS-E) Electronic Fuel Injection Fuel Type: Unleaded Premium Gasoline (91 Octane or higher recommended) Lubrication Oil Type: API SG, SAE 15W-40 or 10W-30 (depending on climate) Cooling Coolant Type: Mercedes-Benz Approved Antifreeze/Coolant (e.g., G48) 🔧 Transmission Standard Transmission Type: 4-speed Automatic Transmission (722.4) Optional Optional Transmission: None (Automatic was standard for 4MATIC models) Features Drive System: 4MATIC Permanent All-Wheel Drive System Transmission Fluid Type: Dexron III or equivalent (MB 236.1 specification) Transmission Fluid Capacity: Approx. 7.0 - 8.0 liters (depending on torque converter drain) 📐 Dimensions Exterior Length: 4740 mm (186.6 in) Width: 1740 mm (68.5 in) Height: 1420 mm (55.9 in) Wheelbase: 2800 mm (110.2 in) Weights Curb Weight: Approx. 1600-1700 kg (3527-3748 lbs) depending on options 🛡️ Safety Features Ratings NHTSA Rating: No specific NHTSA ratings for this era, but considered exceptionally safe for its time due to robust structure. Active Features ABS: Standard Anti-lock Braking System (ABS) Passive Features Airbags: Driver-side airbag (standard from late 1990 onwards, optional earlier) Seatbelts: Front seatbelt pre-tensioners Construction: Reinforced passenger compartment, crumple zones 💡 Technology Features Infotainment Infotainment Features: Factory-installed radio/cassette player, optional CD changer, manual climate control or optional automatic climate control (ACC). Driver Assistance Assistance Features: ABS (Anti-lock Braking System), Cruise Control (optional/standard depending on market/trim). Connectivity Connectivity Features: Limited by modern standards; basic analog systems. 🔧 Maintenance Service Intervals Oil Change Interval: Every 10,000 km (6,200 miles) or 12 months, whichever comes first Air Filter Interval: Every 30,000 km (18,600 miles) or 24 months Fuel Filter Interval: Every 40,000 km (24,800 miles) or 24 months Spark Plug Interval: Every 50,000 km (31,000 miles) or 36 months (for standard plugs) Coolant Flush Interval: Every 2-3 years Transmission Service Interval: Every 50,000-80,000 km (30,000-50,000 miles) or 4-5 years, depending on driving conditions. Fluid Specifications Engine Oil Capacity: Approx. 7.5...