🏷️ Basic Information Identification Make: Mercedes-Benz Model: W123 280S Model Generation: First Generation W123 Production Start Year: 1976 Production End Year: 1985 Codes Chassis Code: W123 👋 Introduction Market Position Target Audience: Do-it-yourself enthusiasts and experienced automotive technicians for the Mercedes-Benz W123 280S. Competitive Analysis Advantage: Digital format offers cost savings and convenience over traditional paper manuals; comprehensive coverage for all aspects of repair and maintenance. Key Features Features: Official full factory service repair manual, hundreds of pages, detailed step-by-step instructions, hundreds of photos and illustrations, printable, no expiry dates. 📋 Manual Details Coverage Areas Primary Coverage: Mercedes-Benz W123 280S Covered Years: 1976, 1977, 1978, 1979, 1980, 1981, 1982, 1983, 1984, 1985 Page Count Estimated Pages: Hundreds Manual Type Type: Factory Service Repair Manual Language Language: English Format Format: PDF 📖 Manual Coverage Systems Covered Engine Service Repair: Yes Transmission Service Repair: Yes Brake System: Yes Wiring Diagrams: Yes Electrical System: Yes Suspension: Yes Steering: Yes Cooling System: Yes Fuel Injection: Yes Fuel System: Yes Emission System: Yes Heating Air Conditioning: Yes Engine Control System: Yes Chassis Body: Yes Restraint System: Yes Interior: Yes Differential Drive: Yes Axle: Yes Procedures Included General Maintenance: Yes Troubleshooting: Yes Periodic Lubrication: Yes Complete Disassembly Reassembly: Yes Technical Depth Depth: Comprehensive, step-by-step instructions with hundreds of photos and illustrations, suitable for DIYers and experienced mechanics. 📊 Manual Specifications File Format Digital Format: PDF Compatibility: All versions of Windows and Mac Access Method: Downloadable, viewable on PCs, laptops, smartphones, tablets, and via web browser. Print Quality Printable: Yes, individual pages or entire manual. Binding Type Binding: Not applicable (digital format) Paper Type Paper Type: Not applicable (digital format) ⚙️ Engine Specifications Primary Engine Engine Type: Inline-6 Cylinder, Naturally Aspirated Engine Code Common: M110 (early variants), M110.987 (later variants) Performance Displacement: 2.8 Liters (2778 cc) Bore X Stroke: 86.0 mm x 80.0 mm Compression Ratio: 8.0:1 or 8.7:1 (depending on market and year) Horsepower Approximate: 138-154 hp @ 5000-5200 rpm (depending on market and emission controls) Torque Approximate: 213-230 Nm @ 3000-3500 rpm (depending on market and emission controls) Fuel System Fuel Delivery: Fuel Injection (Bosch K-Jetronic/CIS for most years) Fuel Type: Unleaded gasoline (Premium recommended) Maintenance Spark Plugs: Champion N9Y or NGK BP5ES (typical, consult manual for specific part numbers) Engine Oil Capacity: Approximately 6.5 - 7.0 Liters (6.9 - 7.4 US Quarts) with filter change. Engine Oil Specification: API SG or higher, viscosity grade 20W-50 or 15W-40 recommended for general use, consult manual for specific temperature ranges. 🔧 Transmission Standard Type: 4-Speed Manual (typical for base models) Optional Type: 4-Speed Automatic (optional, e.g., 4G-TRONIC) Features Automatic Features: Torque converter, selective gear programs (e.g., Economy/Performance). Maintenance Manual Transmission Fluid Type: API GL-4 SAE 80W-90 (typical, verify with manual) Automatic Transmission Fluid Type: MB-Approval 236.1 (e.g., Dexron-II compatible, verify with manual) 📐 Dimensions Exterior Body Styles: Sedan (4-door), Coupe (2-door), Wagon (T-model, 5-door, introduced later) Wheelbase: Approx. 2795 mm (110.0 inches) Length: Approx. 4735 mm (Sedan) / 4770 mm (Coupe) / 4765 mm (Wagon) Width: Approx. 1790 mm Height: Approx. 1430 mm (Sedan/Coupe) / 1500 mm (Wagon) Weights Curb Weight Approximate: 1400 - 1550 kg (depending on body style and equipment) Gross Vehicle Weight Rating Gvwr: Varies by model, consult manual. Wheels Tires Wheel Bolt Pattern: 5x112 Typical Tire Sizes: 175 HR 14, 195/70 R14, 185 HR 14 (depending on model and year) 🛡️ Safety Features Ratings Historical Safety Focus: Known for robust build quality and passenger safety features for its era. Active Features Brakes: Front: Ventilated Disc Brakes; Rear: Drum Brakes (standard). ABS not typically available on early models. Passive Features Seatbelts: Standard front seatbelts, optional rear seatbelts and pre-tensioners. Body Structure: Reinforced safety cell, crumple zones. 💡 Technology Features Infotainment Audio System: Typically an AM/FM radio with cassette player, often with upgraded aftermarket units available. Driver Assistance Features: Power steering, power windows (optional), central locking (vacuum operated), cruise control (optional). Connectivity Features: Limited by era; primarily analog systems. Modern integrations typically aftermarket. 🔧 Maintenance Service Intervals Oil Change Interval: Typically every 7,500 to 10,000 miles (12,000 to 16,000 km) or annually, whichever comes first. Consult manual for specific conditions. Tune Up Interval: Spark plugs, filters, and ignition system checks at intervals recommended by the manual, often around 15,000-30,000 miles. Transmission Service: Automatic transmission fluid and filter change typically every 30,000 to 50,000 miles. Manual transmission fluid change less frequent, around 60,000 miles. Fluid Specifications Coolant: 50/50 mixture of Mercedes-Benz approved antifreeze and distilled water. Brake Fluid: DOT 3 or DOT 4 brake fluid (verify with manual). Known Issues Common Problems: Rust (particularly in wheel arches, door bottoms, and undercarriage), vacuum line failures affecting central locking and other systems, climate control flap actuators, differential seal leaks, and occasional injector issues on fuel-injected models. 📚 Vehicle History Brand Heritage Brand Legacy: Mercedes-Benz has a long-standing reputation...