🏷️ Basic Information Identification Make: Mercedes-Benz Model: 380SEC Model Code: C107 Generation: Second Generation (C107) Years Covered: 1982, 1983 👋 Introduction Market Position Positioning: Luxury Grand Tourer Coupe, representing Mercedes-Benz's pinnacle of engineering and design for the era. Competitive Analysis Competitors: BMW 6 Series (E24), Jaguar XJ-S, Maserati Quattroporte (though different body style). Key Features Design: Elegant pillarless coupe design, aerodynamic profile, high-quality interior materials. Powertrain: Smooth and powerful M116 3.8L V8 engine, refined automatic transmission. Comfort And Luxury: Luxurious appointments, advanced climate control for its time, exceptional ride comfort. 📋 Manual Details Coverage Areas Engine Variants: M116 V8 (3.8L) Transmission Variants: 4-speed Automatic (722.3) Trim Levels: All Page Count Estimated Pages: 1000+ Manual Type Type: Workshop Repair Service Manual Language Language: English Format Format: PDF Download 📖 Manual Coverage Systems Covered Powertrain: Engine (M116), Fuel System, Ignition System, Cooling System, Exhaust System, Transmission (722.3 Automatic) Chassis: Suspension (Front & Rear), Steering System, Braking System (ABS optional), Drivetrain (Driveshafts, Differential) Electrical: Wiring Diagrams, Lighting System, Instrumentation, Power Accessories, Climate Control Electronics, Engine Control Unit (ECU) Diagnostics Body And Interior: Body Panels, Doors, Windows, Convertible Top Mechanism (if applicable to sub-models, though SEC is Coupe), Interior Trim, Seats, Climate Control (HVAC) Procedures Included Maintenance: Routine Servicing, Oil Changes, Filter Replacements, Spark Plug Replacement, Belt Inspection and Replacement, Fluid Checks and Top-offs Repair: Engine Overhaul, Transmission Rebuild, Brake Component Replacement, Suspension Component Replacement, Electrical Component Repair, Fuel System Component Repair Troubleshooting: Diagnostic Flowcharts, Common Faults and Solutions, Electrical System Troubleshooting, Engine Performance Issues, Transmission Shifting Problems Diagnostics: OBD-I (On-Board Diagnostics) procedures, Fault Code Interpretation (where applicable), Sensor Testing, Actuator Testing Technical Depth Depth: Comprehensive from basic maintenance to complete engine and transmission overhauls. Includes detailed diagnostic procedures and component-level repair instructions. 📊 Manual Specifications File Format Format: PDF Searchability: Searchable text enabled Print Quality: High-resolution scans for clear text and diagrams, printable Binding Type Binding: N/A (Digital Download) Paper Type Paper: N/A (Digital Download) ⚙️ Engine Specifications Primary Engine Engine Code: M116 Engine Type: V8 SOHC Displacement: 3839 cc (3.8 Liters) Bore X Stroke: 92.0 mm x 71.5 mm Compression Ratio: 8.3:1 (approx.) Performance Horsepower: 155-160 hp @ 4750-5000 rpm (SAE net) Torque: 220-225 lb-ft @ 2500-3000 rpm (SAE net) Fuel System Fuel Delivery: Bosch K-Jetronic Fuel Injection (CIS - Continuous Injection System) Fuel Type: Unleaded Gasoline (Premium) Engine Management Ignition System: Electronic Ignition with breakerless distributor 🔧 Transmission Standard Type: 4-speed Automatic Transmission Code: 722.3 Features Shift Modes: Standard, Economy (E) Fluid Type Transmission Fluid: MB Spec 236.2 Automatic Transmission Fluid (ATF) or equivalent (e.g., Dexron II compatible) 📐 Dimensions Exterior Length: 4777 mm (188.1 in) Width: 1788 mm (70.4 in) Height: 1370 mm (53.9 in) Wheelbase: 2795 mm (110.0 in) Weights Curb Weight: 1670 kg (3680 lbs) Gross Weight Rating: 2080 kg (4586 lbs) 🛡️ Safety Features Ratings Crash Test Era: Pre-modern crash testing standards, emphasis on passive safety features of the era. Active Features ABS: Optional Anti-lock Braking System (ABS) available on some models. Suspension Stability: Independent suspension contributing to stable handling. Passive Features Airbag: No driver or passenger airbags standard in this period; steering wheel airbag not common yet. Seatbelts: 3-point inertia-reel seat belts (front), lap belts (rear). Body Structure: Reinforced passenger compartment, crumple zones. 💡 Technology Features Infotainment Radio: Period-appropriate Becker or Blaupunkt AM/FM/Cassette stereo systems, often with power antenna. Climate Control: Automatic Climate Control (ACC) with manual override, using vacuum-actuated flaps and electronic sensors for temperature regulation. Driver Assistance Cruise Control: Standard cruise control system. Connectivity Telematics: No integrated telematics or smartphone connectivity. Communication systems are limited to the period's radio and telephone options. 🔧 Maintenance Service Intervals Oil Change: Every 5,000 - 7,500 miles or 6-12 months (whichever comes first), consult manual for specific interval. Air Filter: Inspect every 15,000 miles, replace as needed or every 30,000 miles. Spark Plugs: Replace every 30,000 - 40,000 miles (refer to manual for specific type and gap). Transmission Service: Drain and fill every 30,000 - 50,000 miles (refer to manual for specific fluid and procedure). Fluid Specifications Engine Oil: API SG/SH or higher, SAE 10W-40 or 15W-40 (check manual for ambient temperature recommendations and specific MB approval). Engine Oil Capacity: 7.5 Liters (7.9 US Quarts) with filter change. Coolant: 50/50 mixture of Mercedes-Benz approved coolant (e.g., G48) and distilled water. Brake Fluid: DOT 4 Synthetic Brake Fluid. Known Issues Fuel System: K-Jetronic fuel distributors can become clogged; periodic cleaning or rebuilding may be necessary. Fuel pump strainers can clog. Leaky fuel injectors. Electrical: Wire loom degradation (especially around engine bay), faulty climate control modules, aging vacuum lines for central locking and HVAC. Suspension And Steering: Wear in ball joints, tie rod ends, and bushings can lead to steering looseness and uneven tire wear. Hydraulic self-leveling rear suspension (if equipped) can develop leaks. Rust: Common areas include wheel arches,...