🏷️ Basic Information Identification Make: Mercedes-Benz Model: 280E Generation Model Generation: W123 Codes Chassis Code: W123 👋 Introduction Market Position Positioning: Premium mid-size luxury sedan, renowned for build quality, comfort, and durability. Competitive Analysis Competitors: BMW 5 Series (E28), Audi 100, Volvo 240/740 Key Features Build Quality: Exceptional German engineering and robust construction. Comfort: Supple ride, comfortable seating, and quiet cabin. Reliability: Known for longevity and ability to withstand high mileage with proper maintenance. 📋 Manual Details Coverage Areas Years Covered: 1976, 1977, 1978, 1979, 1980, 1981, 1982, 1983, 1984, 1985 Page Count Estimated Page Count: Approximately 1200+ Manual Type Type: Factory Service Repair Manual Language Language: English Format Format: Digital (PDF) 📖 Manual Coverage Systems Covered Engine: M110 2.8L Inline-6 Cylinder (DOHC) Engine Management: Bosch K-Jetronic Fuel Injection Transmission: 4-speed Manual, 4-speed Automatic (4G-Tronic) Drivetrain: Rear-Wheel Drive Suspension: Independent Front (Double Wishbone), Independent Rear (Multi-Link) Brakes: Front Ventilated Discs, Rear Discs (Power Assisted) Steering: Power Assisted Recirculating Ball Electrical: 12V System, Charging System, Ignition, Lighting, Instrumentation, Accessories Bodywork: Chassis, Body Panels, Doors, Windows, Trim, HVAC System Procedures Included Maintenance: Scheduled maintenance, fluid changes, filter replacements, lubrication Troubleshooting: Diagnostic procedures, symptom-based troubleshooting, electrical fault finding Repair: Engine overhaul, transmission rebuild, brake system repair, suspension component replacement Diagnostics: Component testing, pressure testing, electrical continuity checks Specifications: Torque specifications, clearances, timing, fluid capacities Technical Depth Depth: Comprehensive (from basic maintenance to complete engine and transmission overhauls) 📊 Manual Specifications File Format File Type: PDF Searchability: Fully searchable text Printability: Printable pages Print Quality Image Resolution: High-resolution diagrams and illustrations Binding Type Binding: N/A (Digital) Paper Type Paper: N/A (Digital) ⚙️ Engine Specifications Primary Engine Engine Code: M110.984 (US/Canada), M110.987 (Europe) Engine Type: Naturally Aspirated, SOHC 24-Valve (early models), DOHC 24-Valve (later models) Displacement: 2.8 Liters (2799 cc) Bore X Stroke: 86.0 mm x 80.25 mm Compression Ratio: 8.2:1 or 8.7:1 (depending on market/model year) Performance Horsepower SAE Net: 145-155 hp @ 5250-5500 RPM (approx.) Torque SAE Net: 165-175 lb-ft @ 3000-3500 RPM (approx.) Fuel System Fuel Injection: Bosch K-Jetronic CIS (Continuous Injection System) Fuel Type: Unleaded Gasoline (Premium Recommended) Lubrication Oil Capacity: 7.5 Liters (approx. 8 US Quarts) Recommended Oil Viscosity: SAE 15W-40 or 10W-40 (depending on climate) 🔧 Transmission Standard Standard Transmission: 4-speed Manual Optional Optional Transmission: 4-speed Automatic (4G-Tronic) Features Automatic Transmission Features: Hydraulic torque converter, selective gear engagement, torque converter lock-up (later models) Fluid Specifications Automatic Transmission Fluid Type: Dexron III/Mercon (or equivalent MB specification) 📐 Dimensions Exterior Length: 4725 mm (186.0 in) Width: 1790 mm (70.5 in) Height: 1430 mm (56.3 in) Wheelbase: 2790 mm (109.8 in) Weights Curb Weight: 1450 - 1550 kg (approx.) Gross Vehicle Weight Rating: Approximately 2000 kg Cargo Trunk Volume: 560 Liters (approx.) 🛡️ Safety Features Ratings Federal Motor Vehicle Safety Standards Compliance: Designed to meet 1970s/early 1980s US safety standards. Active Features Braking System: Four-wheel power disc brakes with dual-circuit hydraulic system. Passive Features Seatbelts: Three-point inertia-reel seatbelts in front, lap belts in rear. Steering Column: Collapsible steering column for improved occupant protection. Body Structure: Reinforced passenger compartment, crumple zones. 💡 Technology Features Infotainment Audio System: Factory-installed AM/FM radio with optional cassette player. Upgrades common. Driver Assistance Cruise Control: Optional vacuum-operated cruise control on some models. Connectivity Bluetooth Connectivity: Not originally equipped; aftermarket solutions available. 🔧 Maintenance Service Intervals Oil And Filter Change Interval: Every 10,000 km (6,200 miles) or annually. Air Filter Replacement Interval: Every 20,000 km (12,400 miles) or annually. Spark Plug Replacement Interval: Every 40,000 km (24,800 miles) or as needed. Coolant Flush Interval: Every 2 years or 40,000 km (24,800 miles). Valve Adjustment Interval: Every 40,000 km (24,800 miles) for M110 engine (requires expert inspection). Fluid Specifications Coolant Type: Mercedes-Benz Specification 325.0 (Glysantin G48 or equivalent blue/green silicate-based coolant) Brake Fluid Type: DOT 3 or DOT 4 (Low Viscosity) Power Steering Fluid Type: MB Specification 236.3 (ATF Type A or equivalent) Known Issues Common Wear Items: Fuel pump, fuel accumulators, vacuum lines, fuel injectors, ignition components, suspension bushings, exhaust system. Corrosion Prone Areas: Wheel arches, rocker panels, door bottoms, jacking points, trunk floor. Electrical Issues: Wiring harness degradation, instrument cluster issues, aging relays and switches. K Jetronic Diagnosis: Requires specialized knowledge for fuel pressure and mixture adjustments. 📚 Vehicle History Brand Heritage Mercedes Benz Legacy: Globally recognized for engineering excellence, safety, and luxury since the late 19th century. Model Evolution W123 Introduction: Launched in 1976 as the successor to the W114/W115 series, establishing new benchmarks for durability and refinement. W123 Body Styles: Offered as Sedan (Saloon), Coupe, Estate (Wagon), and Limousine. W123 Updates: Received minor facelift and feature updates throughout its production run, including improved aerodynamics and interior refinements. Production Production Years: 1976-1985 Manufacturing Locations: Germany (main), various international assembly plants. 🏆 Awards & Recognition Recognitions Industry Acclaim: The W123 series is widely praised by automotive journalists and...