🏷️ Basic Information Identification Make: Mercedes-Benz Model: 560 SEL Generation: W126 (Second Generation) Codes Chassis Code: W126.039 Engine Codes: M117 👋 Introduction Market Position Market Segment: Full-size luxury sedan, flagship model. Competitive Analysis Competitors: BMW 7 Series, Audi V8 Quattro, Jaguar XJ, Rolls-Royce Silver Spirit. Key Features Salient Features: Long wheelbase for increased rear legroom, powerful V8 engine, refined ride quality, extensive luxury features, advanced (for its time) technology and safety systems. 📋 Manual Details Coverage Areas Model Years Covered: 1985, 1986, 1987, 1988, 1989, 1990, 1991 Trim Levels Covered: All 560 SEL variants Page Count Estimated Page Count: Varies by year and specific content; comprehensive factory documentation Manual Type Manual Type: Factory Service and Repair Manual Language Language: English Format File Format: PDF (Downloadable) 📖 Manual Coverage Systems Covered Engine: Yes (including M117 5.6L V8, fuel injection, ignition, cooling, lubrication, exhaust) Transmission: Yes (4-speed automatic transmission - 722.3 series) Drivetrain: Yes (rear-wheel drive, driveshaft, differential) Suspension: Yes (front and rear suspension components, self-leveling suspension, hydraulic level control, ADS) Brakes: Yes (hydraulic system, ABS, parking brake, components) Steering: Yes (power steering system, components) Electrical: Yes (wiring diagrams, lighting, starting, charging, accessories, climate control electronics) Body: Yes (body structure, doors, windows, sunroof, convertible top (if applicable to specific models), trim, paint) Climate Control: Yes (HVAC system, refrigerant, filters, heating, ventilation, air conditioning) Fuel System: Yes (Bosch KE-Jetronic fuel injection, fuel pump, filter, lines) Procedures Included Maintenance: Yes (oil change, filter replacement, fluid checks and changes, belt inspections, spark plug replacement, air filter service) Diagnostics: Yes (troubleshooting common issues, component testing, diagnostic procedures) Repair: Yes (component removal and installation, system overhauls, adjustments) Adjustments: Yes (valve clearance, idle speed, injection timing, parking brake, suspension components) Technical Depth Depth: Comprehensive factory-level detail, suitable for professional technicians and advanced DIY enthusiasts. 📊 Manual Specifications File Format File Format Type: PDF Print Quality Print Quality: High quality, printable pages, searchable text. Binding Type Binding Type: Digital Download (N/A for physical binding) Paper Type Paper Type: Digital (N/A for physical paper type) ⚙️ Engine Specifications Primary Engine Engine Type: Naturally Aspirated SOHC V8 Engine Displacement: 5.6 Liters (5549 cc) Bore X Stroke: 94.5 mm x 98.5 mm Compression Ratio: 9.1:1 (approx.) Performance Horsepower: 238 hp @ 4750 rpm (Federal Spec) Torque: 324 lb-ft @ 3000 rpm (Federal Spec) Fuel System Fuel Delivery: Bosch KE-Jetronic Electronic Fuel Injection Fuel Type: Unleaded Premium Gasoline (91 Octane or higher recommended) Lubrication Oil Capacity: 8.5 Liters (8.9 US Quarts) with filter change Recommended Oil Viscosity: SAE 15W-40 or 15W-50 (check owner's manual for climate specific recommendations) Cooling Coolant Capacity: 10.5 Liters (11.1 US Quarts) Coolant Type: MB Spec 325.0 (Glysantin G05 or equivalent) 🔧 Transmission Standard Transmission Type: 4-Speed Automatic Transmission Model: 722.3xx Series Features Transmission Control: Electronic Control Unit (ECU) with hydraulic control elements. Fluid Specifications Fluid Type: MB 236.8 or 236.7 Automatic Transmission Fluid (ATF) Fluid Capacity Fluid Capacity: Approximately 8.0 Liters (8.5 US Quarts) for a dry fill; service fill typically 4-5 liters. 📐 Dimensions Exterior Wheelbase: 3080 mm (121.3 in) Length: 5010 mm (197.2 in) Width: 1790 mm (70.5 in) Height: 1440 mm (56.7 in) Weights Curb Weight: Approximately 1800 - 1900 kg (3968 - 4189 lbs) depending on options. Gross Vehicle Weight Rating: Approximately 2350 kg (5181 lbs) 🛡️ Safety Features Ratings Crash Test Ratings: While formal NHTSA/Euro NCAP ratings were less standardized for this era, the W126 was renowned for its robust build quality and occupant protection. Features like crumple zones and reinforced safety cage contributed to high safety for its time. Active Features ABS: Standard (Anti-lock Braking System) Passive Features Airbags: Driver's airbag became standard during the later years of this generation (optional earlier). Seatbelts: Front seatbelt height adjustment, rear seatbelts. 💡 Technology Features Infotainment Audio System: Factory premium sound systems, often with Becker brand head units. Cassette player common. Driver Assistance Cruise Control: Standard Traction Control: ASR (Acceleration Slip Regulation) became available on some later models, but not standard across all years/trims. Climate Control Automatic Climate Control: Optional or standard on higher trims (Thermotronic). 🔧 Maintenance Service Intervals Oil Change Interval: Typically every 10,000-15,000 km (6,000-9,000 miles) or 12 months, using quality synthetic oil. Transmission Service: Fluid and filter change recommended every 50,000-80,000 km (30,000-50,000 miles). Coolant Flush Interval: Every 2-3 years or 40,000-60,000 km (25,000-37,000 miles). Spark Plug Replacement: Typically every 30,000-50,000 km (18,000-30,000 miles), depending on plug type (e.g., copper vs. platinum). Fluid Specifications Brake Fluid Type: DOT 3 or DOT 4 Power Steering Fluid: MB Spec 236.3 Hydraulic Fluid (e.g., Pentosin CHF 11S is a common modern replacement, but verify). Known Issues Common Problems: Hydraulic system leaks (suspension, power steering), fuel distributor issues (KE-Jetronic), wiring harness degradation (especially insulation), idle control valve problems, climate control panel failures, door lock actuator issues, window regulator failures. Corrosion Areas: Wheel arches, rocker panels,...