Market Segment:
Full-size luxury sedan, flagship model.
Competitors:
BMW 7 Series, Audi V8 Quattro, Jaguar XJ, Rolls-Royce Silver Spirit.
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.
Model Years Covered:
1985, 1986, 1987, 1988, 1989, 1990, 1991
Trim Levels Covered:
All 560 SEL variants
Estimated Page Count:
Varies by year and specific content; comprehensive factory documentation
Manual Type:
Factory Service and Repair Manual
File Format:
PDF (Downloadable)
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)
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)
Depth:
Comprehensive factory-level detail, suitable for professional technicians and advanced DIY enthusiasts.
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.)
Horsepower:
238 hp @ 4750 rpm (Federal Spec)
Torque:
324 lb-ft @ 3000 rpm (Federal Spec)
Fuel Delivery:
Bosch KE-Jetronic Electronic Fuel Injection
Fuel Type:
Unleaded Premium Gasoline (91 Octane or higher recommended)
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)
Coolant Capacity:
10.5 Liters (11.1 US Quarts)
Coolant Type:
MB Spec 325.0 (Glysantin G05 or equivalent)
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.
ABS:
Standard (Anti-lock Braking System)
Airbags:
Driver's airbag became standard during the later years of this generation (optional earlier).
Seatbelts:
Front seatbelt height adjustment, rear seatbelts.
Audio System:
Factory premium sound systems, often with Becker brand head units. Cassette player common.
Traction Control:
ASR (Acceleration Slip Regulation) became available on some later models, but not standard across all years/trims.
Automatic Climate Control:
Optional or standard on higher trims (Thermotronic).
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).
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).
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, jacking points, around windshield and rear window seals.
Brand Legacy:
Mercedes-Benz has a long-standing reputation for engineering excellence, luxury, and safety, particularly with its S-Class line, which this 560 SEL represents.
W126 Generation Timeline:
Introduced in late 1979 as a 1980 model, the W126 received a significant facelift in 1985 (often referred to as the 'facelift II' or 'M-Facelift') which included updated aerodynamics, revised interior, and the introduction of the larger 5.6L M117 engine for the 560 SEL and SEC models. The 560 SEL became the flagship of the range.
Production Years For 560 Sel:
1986-1991 (North American market). Globally, the 560 models (including SEC and SE) were introduced from 1985.
Manufacturing Locations:
Sindelfingen, West Germany
