🏷️ Basic Information Identification Make: Mercedes-Benz Model: 300SL Year: 1992 Generation Chassis Code: R129 Codes Model Code: 129.030 👋 Introduction Market Position Vehicle Segment: Luxury Grand Tourer / Sports Car Brand Perception: High-performance, sophisticated engineering, build quality, and luxury Competitive Analysis Competitors: Porsche 911, BMW 8 Series (E31), Jaguar XJS, Chevrolet Corvette (C4) Key Features Highlight: Electrically operated soft top and hardtop (optional), advanced suspension, powerful inline-six engine, robust build quality Manual Value: Provides essential, in-depth information for owners and technicians to maintain and repair this complex luxury vehicle. 📋 Manual Details Coverage Areas Primary Coverage: Service and Repair Secondary Coverage: Maintenance, Diagnostics, Troubleshooting, Technical Data Page Count Estimated Pages: Approx. 1000-1500+ (typical for comprehensive Mercedes-Benz factory manuals of this era) Manual Type Type: Official Factory Service Manual (Electronic/Software) Language Language: English Format Format: Software/Digital (likely searchable PDF or proprietary viewer) 📖 Manual Coverage Systems Covered Powertrain: Engine (M104), Transmission (722.5 5-Speed Automatic) Chassis: Suspension (Hydropneumatic front, Independent rear), Steering (Power-assisted recirculating ball), Brakes (Front Ventilated Discs, Rear Solid Discs, ABS) Electrical: Engine Control Unit (ECU), Fuel Injection System (Bosch KE-Jetronic), Ignition System, Lighting, Instrumentation, Power Accessories, Convertible Top System, Anti-theft System Body: Body Structure, Exterior Panels, Convertible Top Mechanism, Interior Trim, Seating Procedures Included Routine Maintenance: Oil change, filter replacement, fluid checks and top-offs, spark plug replacement, belt inspection and replacement Diagnostics: Fault code retrieval (OBD-I), component testing, electrical circuit tracing, fuel system diagnostics, engine performance troubleshooting Repair Overhaul: Engine rebuild procedures, transmission overhaul, suspension component replacement, brake system repair, convertible top mechanism repair, electrical component replacement Adjustment Calibration: Idle speed adjustment, ignition timing (if applicable), convertible top alignment, headlight aiming Technical Depth Depth: Comprehensive: Covers everything from basic fluid changes and inspections to complete engine and transmission rebuilds, including detailed electrical schematics and diagnostic procedures. Detail Level: Expert-level detail with torque specifications, clearances, diagnostic flowcharts, and component removal/installation instructions. 📊 Manual Specifications File Format Format Details: Digital software, likely searchable and bookmarked for easy navigation. Print Quality Quality: High-resolution digital rendering of original factory documentation, ensuring clarity of diagrams and text. Binding Type Binding Type: N/A (Digital Software) Paper Type Paper Type: N/A (Digital Software) ⚙️ Engine Specifications Primary Engine Engine Type: Inline 6-cylinder, Double Overhead Camshaft (DOHC), 24 valves Engine Code: M104.980 Displacement: 3.0 Liters (2960 cc) Bore X Stroke: 89.9 mm x 78.4 mm Compression Ratio: 10.0:1 Performance Horsepower: 228 hp @ 6400 rpm Torque: 200 lb-ft (271 Nm) @ 4400 rpm Fuel System Fuel Delivery: Bosch KE-Jetronic Electronic Fuel Injection with Lambda Control Fuel Type: Premium Unleaded Gasoline (91+ Octane) Ignition System Type: Electronic Ignition System with Knock Control Cooling System Type: Water-cooled, Thermostatically Controlled Lubrication System Oil Capacity: 7.5 Liters (7.9 US Quarts) with filter change Recommended Oil Viscosity: SAE 15W-40 or 10W-30 (depending on climate, check manual for specifics) 🔧 Transmission Standard Type: 4-speed Automatic with Lock-up Torque Converter (722.4, later 722.5 5-speed available on some models, confirm for specific 1992 300SL variant) Features Shift Modes: Standard, Economy (E) and Sport (S) modes (722.5) Fluid Type Fluid Specification: MB 236.1 or MB 236.3 Automatic Transmission Fluid (ATF) Fluid Capacity Capacity: Approx. 7.5 Liters (dry fill, check manual for specific refill amounts) 📐 Dimensions Exterior Length: 174.1 inches (4422 mm) Width: 70.5 inches (1791 mm) Height: 51.2 inches (1300 mm) Wheelbase: 98.8 inches (2510 mm) Front Track: 59.4 inches (1509 mm) Rear Track: 58.1 inches (1476 mm) Weights Curb Weight: Approx. 3700 lbs (1678 kg) Gross Vehicle Weight Rating: Approx. 4563 lbs (2069 kg) Weight Distribution F/R: Approx. 50/50 Towing Capacity: Not Recommended Wheels Tires Standard Wheel Size: 15 x 7.0 J Standard Tire Size: 205/60R15 Bolt Pattern: 5 x 112 mm Center Bore: 66.5 mm 🛡️ Safety Features Ratings NHTSA Rating: Not directly applicable in modern format; designed to high safety standards for its era. Active Features ABS: Standard Anti-lock Braking System (ABS) Traction Control: Optional (ASR - Acceleration Slip Regulation on some models) Passive Features Airbags: Driver's Airbag Standard, Passenger Airbag Optional/Standard on later production. Rollover Protection: Automatic roll bar deployment system Seatbelts: Three-point inertia-reel seatbelts with pretensioners 💡 Technology Features Infotainment Audio System: Premium sound system (e.g., Becker or Bose), often with cassette player and optional CD changer. Climate Control: Automatic climate control with air conditioning Driver Assistance Cruise Control: Standard electronic cruise control Memory Seats: Optional electrically adjustable seats with memory function Connectivity Bluetooth: Not available in original configuration. Aftermarket solutions exist. 🔧 Maintenance Service Intervals Oil Service: Every 7,500 miles (12,000 km) or 12 months, whichever comes first. Major Service: Detailed intervals for spark plugs, transmission fluid, coolant, brake fluid, and other components outlined in the factory service manual. Fluid Specifications Engine Oil: Refer to manual for specific API rating and viscosity based on climate (e.g., MB 229.1 compliant oils are often suitable). Coolant: Mercedes-Benz Approved Antifreeze/Coolant (e.g., G05...