🏷️ Basic Information Identification Make: Mercedes-Benz Model: W123 280 Production Years: 1976-1985 Chassis Code: W123 Engine Designation: M110 (Inline-6, 2.8L) 👋 Introduction Market Position Target Audience: DIY mechanics, classic car enthusiasts, professional repair shops specializing in vintage Mercedes-Benz Competitive Analysis Value Proposition: Provides factory-level diagnostic, repair, and maintenance information, enabling significant cost savings on repairs and maintenance Key Features Benefits: Up-to-date technical information, detailed procedures, diagnostic guidance, and comprehensive coverage of all vehicle systems Source Credibility Origin: Original workshop manual, same as used in local service/repair shops, written by the manufacturer 📋 Manual Details Coverage Areas Regions Covered: Global (All Models/Engines/Trim/Transmissions) Page Count Estimated Pages: Hundreds (Exact count not specified, but described as 'hundreds of pages') Manual Type Type: Workshop Repair Service Manual Language Language: English Format Format: PDF Download 📖 Manual Coverage Systems Covered Engine Management: Engine Service/Repair, Fuel Injection/Fuel System, Engine Control System, Emission System, Cooling System Drivetrain: Transmission Service/Repair, Differential/Drive, Axle Chassis: Brake System, Suspension, Steering, Chassis/Body Electrical And HVAC: Electrical System, Wiring Diagram, Heater/Air Conditioner Interior And Safety: Restraint System, Interior Procedures Included Maintenance: General Maintenance, Periodic Lubrication Repair: Detailed substeps expand on repair procedure information, Disassembly, Assembly, Reinstalling Procedures Diagnostics: Troubleshooting, Electrical System Diagnosis and Repair Technical Depth Depth: Comprehensive diagnostics, repair, and maintenance information used by professional technicians Illustrations Visuals: Detailed illustrations, drawings and photos, Enlarged inset helps identify and examine parts 📊 Manual Specifications File Format File Type: PDF Print Quality Printability: Full Printable Zoom Capabilities Zoom: Zoom IN/OUT enabled Delivery Method Delivery: Instant Download Software Requirements Requirements: Adobe PDF Reader & WinZip Compatibility Operating Systems: Compatible with All Versions of Windows & Mac ⚙️ Engine Specifications Primary Engine Engine Type: Inline 6-Cylinder Displacement: 2.8 Liters (2780 cc) Engine Code: M110 Performance Horsepower Range: Approximately 150-180 hp (depending on specific variant and market) Torque Range: Approximately 177-200 lb-ft (depending on specific variant and market) Fuel System Fuel Delivery: Bosch K-Jetronic (CIS) Mechanical Fuel Injection Ignition System Ignition Type: Electronic Ignition System 🔧 Transmission Standard Transmission Type: 4-speed manual (common) Optional Transmission Type: 4-speed automatic (common) Features Overdrive: Some automatic transmissions may feature overdrive 📐 Dimensions Exterior Body Styles: Sedan (4-door), Coupe (2-door), Station Wagon (T-model, 5-door) Weights Curb Weight: Approximately 1450-1650 kg (3197-3638 lbs), varies by body style and equipment 🛡️ Safety Features Ratings Crash Test History: W123 platform generally well-regarded for its robust construction for the era. Specific ratings may vary by region and testing body. Passive Features Features: Reinforced safety cage, crumple zones, padded interior, seat belts (front standard, rear optional/standard by year/market) Active Features Features: Four-wheel disc brakes (standard on 280 model), power steering 💡 Technology Features Infotainment Features: Typically AM/FM radio, often with cassette player. Basic analog controls. Driver Assistance Features: ABS (Anti-lock Braking System) became available as an option on later models. Cruise control (optional). Comfort Features Climate Control: Manual or automatic climate control systems were available. 🔧 Maintenance Service Intervals Oil Change: Typically every 7,500 - 15,000 miles (12,000 - 24,000 km) or 12 months, consult manual for specific intervals based on driving conditions. Major Tune Up: Refer to manual for scheduled intervals for spark plugs, fuel filter, air filter replacement. Fluid Specifications Engine Oil: Refer to manual for specific viscosity (e.g., SAE 20W-50, SAE 10W-40) and API classification based on climate. Typically high-quality synthetic or semi-synthetic recommended. Coolant: Mercedes-Benz approved coolant (e.g., G48) with a 50/50 mix of antifreeze and distilled water. Transmission Fluid Auto: Dexron-III or equivalent ATF (Automatic Transmission Fluid). Specific Mercedes-Benz part number reference in manual is crucial. Brake Fluid: DOT 3 or DOT 4 brake fluid. Power Steering Fluid: Dexron-II or equivalent hydraulic fluid. Consult manual for specific MB approval. Known Issues Common Wear Items: Suspension bushings, ball joints, tie rod ends, fuel distributor O-rings, vacuum hoses, engine mounts. Electrical Gremlins: Can occur due to age; wiring insulation degradation, faulty relays, and aged switches are common. Detailed wiring diagrams are essential. Cooling System: Radiator leaks, water pump failures, thermostat issues, and heater core clogs can occur with age. Part Numbers Oil Filter Example: Mann-Filter W102, Bosch 0 451 103 003 (Note: Always verify part number for specific VIN) Air Filter Example: Mann-Filter C35164, Bosch 1 457 429 957 (Note: Always verify part number for specific VIN) 📚 Vehicle History Brand Heritage Manufacturer Reputation: Mercedes-Benz known for engineering excellence, durability, and luxury. Model Evolution W123 Series Impact: The W123 series cemented Mercedes-Benz's reputation for reliability and build quality, becoming an iconic model. Production Production Period: 1976-1985 Production Locations Manufacturing Sites: Various Mercedes-Benz plants globally, notably in Germany. 🏆 Awards & Recognition Recognitions Model Reputation: The W123 series is widely recognized for its exceptional durability, reliability, and long-term value, often referred to as 'built like a tank'.