🏷️ Basic Information Identification Make: Mercedes-Benz Model: 300 SD Turbo Generation: W126 (Second Generation S-Class) Production Years: 1981-1985 Codes Chassis Code: W126.120 Engine Code: OM617 (Inline 5-cylinder Diesel) 👋 Introduction Market Position Target Audience: Mercedes-Benz 300 SD Turbo owners and independent repair shops Competitive Analysis Competitor Manuals: Other service manual providers; likely superior in detail and factory accuracy compared to generic Haynes/Chilton for this era of Mercedes Key Features Delivery Method: Instant Download Organization: Completely bookmarked and easily navigable 📋 Manual Details Coverage Areas Covered Years: 1981, 1982, 1983, 1984, 1985 Page Count Estimated Page Count: Extensive (specific number not provided, but described as 'complete') Manual Type Type: Factory Service and Repair Manual Language Language: English Format Format: PDF (Digital Download) 📖 Manual Coverage Systems Covered Engine: Yes (including oil/filter, valve clearance, injection timing, fuel filter, air filter, V-belts, intake/exhaust, spark plugs, cooling system) Transmission: Yes (Manual and Automatic transmission fluid changes, level checks, filter changes for automatic) Brakes: Yes (fluid level, lines, pads/discs, parking brake, fluid replacement, brake testing) Suspension: Yes (front axle oil, ball joints, rear axle oil, rear axle mount, level control, ADS, 4MATIC, self-leveling suspension) Steering: Yes (power steering fluid, steering play, steering bolts) Electrical: Yes (warning lamps, battery fluid, headlamp/exterior lamps, wiper/washer systems) Bodywork: Yes (suspension and body structure inspection, water leakage, corrosion, door hinges/locks, sunroof, soft top, hood, paint damage, noise encapsulation) HVAC: Yes (cooling/heating system, dust filter, active charcoal filter, recirculating air filter, AC refrigerant charge) Fuel System: Yes (fuel filter, injection timing, fuel system condition) Procedures Included Maintenance: Yes (routine oil changes, fluid checks, filter replacements, belt tensioning, lubrication) Troubleshooting: Implied through diagnostic steps and component inspection Repair: Yes (detailed instructions for component replacement and adjustment) Inspection: Yes (comprehensive inspection procedures for various systems and components) Technical Depth Depth: Factory-level, comprehensive (covers detailed repair and maintenance as used by dealers) 📊 Manual Specifications File Format File Type: PDF Searchability: Fully searchable Print Quality Printable: Yes (all pages printable) Binding Type Binding Method: Digital Download (no physical binding) Paper Type Paper Type: N/A (digital format) File Quality File Origin: Real files, not scans ⚙️ Engine Specifications Primary Engine Engine Type: Inline 5-cylinder, Turbocharged Diesel Engine Code: OM617.952 Displacement: 3.0 Liters (2998 cc) Performance Horsepower: Approx. 125 hp @ 4350 rpm (varies slightly by year and specific market) Torque: Approx. 230 lb-ft @ 2400 rpm (varies slightly by year and specific market) Fuel System Injection System: Bosch Inline Fuel Injection Pump Maintenance Spec Valve Adjustment Interval: Typically every 15,000 - 25,000 miles or as needed (covered in manual) 🔧 Transmission Standard Transmission Type: 4-speed Automatic (4G-TRONIC) Optional Optional Transmission: Not typically offered in the US market for the 300 SD Turbo; primarily automatic Features Automatic Transmission Fluid Type: Specify MB 236.3 (e.g., Dexron II/III compatible, refer to manual for exact spec) Maintenance Spec Automatic Transmission Fluid Capacity: Approx. 8-10 liters (check dipstick with engine running at operating temp) 📐 Dimensions Exterior Length: Approx. 198.9 inches (5052 mm) Width: Approx. 70.5 inches (1791 mm) Height: Approx. 56.1 inches (1425 mm) Weights Curb Weight: Approx. 3,700 - 3,900 lbs (1680 - 1770 kg) 🛡️ Safety Features Ratings Crash Test Results: No modern standardized crash test ratings available from IIHS/NHTSA for this era. Known for robust construction. Active Features Anti Lock Brakes: Available on some later models within this range, not standard on all. Passive Features Seatbelts: Standard front and rear seatbelts (manual specifies inspection). Crumple Zones: Yes, advanced for its time. 💡 Technology Features Infotainment Audio System: Factory AM/FM radio with cassette player, power antenna. Instrument Cluster: Analog gauges, oil pressure, temperature, fuel, tachometer, speedometer, odometer, trip odometer, warning lamps. Driver Assistance Cruise Control: Yes, standard. Automatic Climate Control: Yes, often equipped with a sophisticated climate control system. Connectivity Original Connectivity: N/A (pre-digital era) 🔧 Maintenance Service Intervals Oil Change Interval: Refer to manual; typically every 3,000-5,000 miles or 6 months Transmission Fluid Change Interval: Refer to manual; typically every 30,000-60,000 miles Fluid Specifications Engine Oil Type: API CD or higher, specific viscosity grade (e.g., 15W-40 or 20W-50 depending on climate, refer to manual). Coolant Type: Ethylene glycol based antifreeze, refer to manual for specific MB approval. Brake Fluid Type: DOT 3 or DOT 4 (check manual for exact specification). Known Issues Common Problems: Vacuum system leaks, climate control issues, hydro-pneumatic suspension (if equipped) leaks, injector pump seals, glow plug system, rust in common Mercedes areas (wheel arches, rocker panels). 📚 Vehicle History Brand Heritage Mercedes Benz Legacy: Renowned for engineering excellence, durability, and luxury. Model Evolution W126 Development: Successor to the W116, featuring significantly improved aerodynamics, safety, and comfort. The 300 SD Turbo was a key model for Mercedes-Benz's diesel offerings in North America. Production Manufacturing Location: Germany 🏆 Awards & Recognition Recognitions Industry Recognition: The W126 chassis was widely acclaimed for its pioneering safety...