Market Segment:
Full-size luxury sedan, flagship model of Mercedes-Benz for its era
Target Audience:
Affluent professionals, executives, discerning car enthusiasts
Key Competitors:
BMW 7 Series, Cadillac Eldorado/Seville, Jaguar XJ Series, Rolls-Royce Silver Spirit
Distinctive Attributes:
Exceptional build quality, advanced engineering, luxurious comfort, powerful V8 engine, sophisticated styling
Manual Value Proposition:
Enables owners and technicians to maintain and repair a complex, high-value classic vehicle with accuracy and confidence.
Engine Mechanical:
Full engine overhaul, component testing, timing, sealing
Engine Management:
Fuel injection (K-Jetronic/KE-Jetronic), ignition system, emission controls, diagnosis
Transmission Mechanical:
Automatic transmission (4-speed 722.3) overhaul, adjustments, troubleshooting
Transmission Electrical:
Transmission control module (if applicable), sensors, solenoids
Brakes:
Hydraulic system, ABS (Anti-lock Braking System), brake pads, rotors, lines, calipers
Suspension:
Independent suspension, front and rear, shock absorbers, springs, control arms, steering linkage
Steering:
Power steering system, steering gearbox, linkages, diagnosis
Electrical System:
Wiring diagrams, charging system, starting system, lighting, accessories, fuse/relay identification
Climate Control:
HVAC system, A/C compressor, R12 refrigerant, heater core, blower motor, controls
Body And Trim:
Body panels, doors, windows, locks, interior trim, convertible top (if applicable for SEC variant, though SEL is sedan)
Chassis:
Frame construction, body mounts, undercoating
Routine Maintenance:
Oil changes, filter replacements, spark plugs, belts, hoses, fluid checks
Diagnostic Procedures:
Troubleshooting charts, symptom-based diagnostics, component testing
Repair Procedures:
Step-by-step instructions for all major mechanical and electrical components
Rebuilding Procedures:
Detailed instructions for engine, transmission, and major component rebuilds
Restoration Guidance:
Information applicable to refurbishing and restoring classic Mercedes-Benz vehicles
Depth:
Expert level, suitable for professional mechanics and advanced DIY enthusiasts
Diagnostic Tools:
Procedures often require specialized Mercedes-Benz diagnostic equipment of the era
Engine Type:
V8, SOHC (Single Overhead Camshaft)
Displacement:
5.0 Liters (4973 cc)
Bore X Stroke:
96.0 mm x 85.0 mm
Compression Ratio:
8.0:1 (approx.)
Horsepower:
180-230 hp (depending on market and specific tuning)
Torque:
270-320 lb-ft (depending on market and specific tuning)
Fuel Delivery:
Bosch K-Jetronic or KE-Jetronic fuel injection
Fuel Type:
Unleaded gasoline (premium, 91 octane or higher recommended)
Engine Oil Capacity:
8.5 Liters (with filter) - consult manual for exact specification (e.g., 15W-40, 10W-40)
Transmission Type:
4-speed automatic
Transmission Model:
722.3 (or equivalent)
Optional Transmission:
None offered for 500 SEL in this era
Transmission Fluid Type:
ATF Dexron III or equivalent (consult manual for exact MB spec, e.g., MB 236.3)
Transmission Fluid Capacity:
Approximately 7.0-8.0 Liters (dry fill, varies with torque converter fill)
Crash Test Data:
Limited formal crash test data from modern standards, but known for robust chassis and passenger cell construction.
Active Safety Features:
ABS (Anti-lock Braking System), advanced suspension geometry, powerful disc brakes
Passive Safety Features:
Reinforced passenger cell, crumple zones, energy-absorbing steering column, dual front airbags (late models/optional), seat belt pre-tensioners
Audio System:
Original Becker or Blaupunkt radios, often with cassette decks. Upgrades are common.
Features:
Analog climate controls, power accessories (windows, seats, mirrors), cruise control, central locking.
Advanced Features:
ABS, cruise control, potentially headlight washers and limited slip differential (LSD) as options.
Connectivity Options:
No modern connectivity features like Bluetooth or USB. Antennas are typically power-operated.
Oil Change Interval:
Typically 10,000-15,000 km (6,000-10,000 miles) or annually, depending on usage and oil quality. Consult manual.
Transmission Service:
Fluid and filter change every 40,000-60,000 km (25,000-40,000 miles). Consult manual.
Major Service Intervals:
Spark plugs, fuel filter, air filter, cooling system flush at specified intervals (e.g., 60,000-100,000 km).
Coolant Type:
Mercedes-Benz approved G48 coolant (phosphate-free, ethylene glycol based) or equivalent.
Brake Fluid Type:
DOT 3 or DOT 4 brake fluid (ensure high boiling point).
Power Steering Fluid:
Pentosin CHF 11S or equivalent approved hydraulic fluid.
Common Wear Items:
Engine mounts, suspension bushings, climate control vacuum lines, fuel distributor O-rings, window regulators, starter solenoid.
Electrical Gremlins:
Aging wiring insulation, corroded connectors, failing relays, and vacuum leaks are common sources of intermittent issues.
K Jetronic Issues:
Fuel distributor leaks, control pressure regulator (WUR) failure, and air flow meter sensor wear can affect fuel mixture.
Mercedes Benz Legacy:
Long-standing reputation for engineering excellence, luxury, safety, and durability.
W126 Development:
Successor to the W116 S-Class, introduced in 1979, represented a significant leap in aerodynamics, safety, and comfort for its time.
500 Sel Positioning:
The 500 SEL was the high-performance, long-wheelbase version of the W126, offering enhanced rear passenger space and comfort.
Production Period:
1979-1991 (W126 generation)
Manufacturing Location:
Germany (primarily Sindelfingen)
