🏷️ Basic Information

Make:

Mercedes-Benz

Model:

SL500

Year:

1994

Chassis Code:

R129

Engine Code:

M119 E50

👋 Introduction

Market Position:

The 1994 Mercedes-Benz SL500 (R129) represented the pinnacle of German engineering and luxury grand touring convertibles, competing with high-end offerings from Jaguar, BMW, and Porsche. It was a statement vehicle for discerning buyers.

Competitive Analysis:

The R129 SL series was renowned for its robust build quality, advanced technology for its era, and refined driving experience. This manual provides the detailed technical information necessary to maintain and repair such a sophisticated vehicle.

Key Features:

V8 engine, advanced suspension and braking systems, automatic climate control, power-operated convertible top with integrated roll bar, and a luxurious interior. This manual is essential for preserving these features.

📋 Manual Details

Coverage Areas:

Engine, Transmission, Drivetrain, Suspension, Steering, Brakes, Electrical Systems, HVAC, Bodywork, Interior, Diagnostics, Troubleshooting

Page Count:

Approximately 1500+ Pages (Typical for comprehensive workshop manuals)

Manual Type:

Official Service and Repair Manual Software

Language:

English

Format:

Digital Software (likely PDF or proprietary executable)

Version Control:

Official Mercedes-Benz documentation, ensuring accuracy and adherence to factory standards. Likely derived from official factory service bulletins and workshop manuals.

📖 Manual Coverage

Engine Mechanical:

Engine assembly, cylinder heads, pistons, crankshaft, camshafts, valve train, lubrication system, cooling system, fuel injection system (Bosch LH-Jetronic), ignition system

Engine Management:

ECU diagnostics, sensor data, actuator control, emission control systems (OBD-I)

Transmission:

4-speed automatic transmission (722.4), torque converter, hydraulic control, electronic control unit (EZL/EZK)

Drivetrain:

Rear-wheel drive, differential, axles, driveshafts, U-joints

Suspension:

Front independent suspension (double wishbone), rear independent suspension (multi-link), adaptive damping system (ADS) functionality, springs, shock absorbers, control arms

Steering:

Hydraulic power steering, steering gear, steering column, steering wheel lock

Brakes:

Front and rear disc brakes, anti-lock braking system (ABS - Bosch 2.3), brake fluid specifications, bleeding procedures

Electrical System:

12V electrical system, battery, alternator, starter, fuses, relays, wiring diagrams, lighting systems, power windows, power seats, central locking, convertible top operation

HVAC System:

Automatic climate control (Klima-automatik), A/C system components, refrigerant, heater core, blower motor

Body And Interior:

Body panels, doors, hood, trunk, convertible top mechanism, interior trim, seats, airbags (SRS - Supplemental Restraint System)

Maintenance:

Routine inspections, oil and filter changes, fluid level checks and top-offs, spark plug replacement, air filter replacement, drive belt inspection and replacement

Troubleshooting:

Diagnostic charts, symptom-based troubleshooting, common fault identification

Repair Procedures:

Detailed step-by-step instructions for component removal, installation, and repair across all covered systems

Technical Specifications:

Torque values, clearances, alignments, electrical schematics, component identification

Diagnostics:

Information on diagnostic trouble codes (DTCs) for OBD-I systems, component testing procedures using multimeters and specialized tools

Wheel Alignment Specs:

Includes front and rear wheel alignment specifications (camber, caster, toe) essential for proper handling and tire wear.

Diagnostic Charts:

Provides systematic diagnostic flowcharts for common issues, guiding technicians through fault identification and resolution.

Technical Depth:

Comprehensive, covering basic maintenance to advanced component-level diagnostics and repair. Suitable for professional mechanics and experienced DIY enthusiasts.

📊 Manual Specifications

File Format:

Digital (Likely searchable PDF or proprietary executable format for ease of navigation and searching)

Print Quality:

N/A (Digital format, but original manual would have high-quality diagrams and text)

Binding Type:

N/A (Digital format)

Paper Type:

N/A (Digital format)

Searchability:

Digital format typically offers robust search functionality by keywords, component names, or DTCs, significantly aiding in diagnostics and repair.

⚙️ Engine Specifications

Engine Type:

Naturally Aspirated V8 (SOHC)

Displacement:

4973 cc (5.0 Liters)

Bore X Stroke:

96.5 mm x 85.0 mm

Compression Ratio:

10.0:1

Horsepower:

322 hp @ 5500 rpm (SAE Net)

Torque:

347 lb-ft @ 3900 rpm (SAE Net)

Fuel Delivery:

Bosch LH-Jetronic Electronic Fuel Injection

Fuel Type:

Premium Unleaded Gasoline (91+ Octane)

Fuel Pump Pressure:

Approx. 3.5 - 4.0 Bar (50-58 PSI)

Ignition Type:

Distributorless Electronic Ignition (EZL/EZK)

Spark Plugs:

Bosch H7DC or equivalent (check manual for exact spec)

Emission Control Systems:

Catalytic converters, secondary air injection (if equipped), exhaust gas recirculation (EGR, if equipped), secondary air injection pump and valves.

🔧 Transmission

Transmission Type:

4-Speed Automatic (722.4)

Optional Transmission:

N/A (All R129 SL500 models in 1994 were equipped with the 4-speed automatic)

Shift Modes:

Comfort (C) and Sport (S) modes

Transmission Fluid Type:

MB 236.1, MB 236.2, or MB 236.3 Automatic Transmission Fluid (ATF)

Transmission Fluid Capacity:

Approximately 7.0 - 8.0 Liters (1.5 - 2.0 Quarts) for a dry fill, check manual for accurate fill level

📐 Dimensions

Length:

187.1 inches (4753 mm)

Width:

70.2 inches (1783 mm)

Height:

51.6 inches (1311 mm)

Wheelbase:

104.7 inches (2659 mm)

Curb Weight:

Approx. 4012 lbs (1820 kg)

Gross Vehicle Weight Rating Gvwr:

Approx. 4784 lbs (2170 kg)

Trunk Volume:

Approx. 8.3 cubic feet (with soft top stored)

🛡️ Safety Features

Crash Test Ratings:

NHTSA and IIHS data for this specific model year may vary. Refer to original manufacturer documentation or safety archives for definitive ratings.

Active Safety Features:

Anti-lock Braking System (ABS), Traction Control System (ASR - often optional/integrated, check specific vehicle)

Passive Safety Features:

Driver and passenger airbags, integrated roll bar (automatically deploys in a rollover), seat belts with pretensioners, reinforced safety cage construction

Airbag System Type:

Supplemental Restraint System (SRS)

💡 Technology Features

Infotainment System:

Original Becker Mexico cassette radio with optional CD changer. Analog climate control and basic trip computer.

Driver Assistance Features:

ABS, Traction Control (ASR, often optional), Cruise Control.

Connectivity:

Limited by era; primarily for diagnostic port (OBD-I) connection for troubleshooting.

Convertible Top Operation:

Fully hydraulic power-operated soft top with integrated pop-up roll bar for rollover protection. Complex system with numerous hydraulic cylinders and lines.

🔧 Maintenance

Oil Change Interval:

Every 7,500 miles (12,000 km) or 12 months, whichever comes first. Refer to manual for specific driving conditions.

Transmission Fluid Service:

Recommended every 30,000 miles (48,000 km) or as per manual recommendations based on usage.

Coolant Flush:

Every 30,000 miles (48,000 km) or 2-3 years.

Brake Fluid Flush:

Every 24,000 miles (38,000 km) or 2 years.

Engine Oil Specification:

MB 229.1 specification, typically 10W-30 or 5W-40 synthetic oil. Consult manual for exact viscosity based on climate.

Engine Oil Capacity:

Approximately 8.0 Liters (8.5 Quarts) with filter change. Verify in manual.

Coolant Type:

Mercedes-Benz Approved Antifreeze/Coolant (e.g., G48, silicate-free, blue-green color)

Power Steering Fluid:

MB 236.3 specification hydraulic fluid (e.g., Pentosin CHF 11S or equivalent)

Brake Fluid Type:

DOT 3 or DOT 4 brake fluid, depending on manufacturer recommendation. Verify in manual.

Known Issues:

Age-related issues common to 1990s Mercedes-Benz: Biodegradable wiring insulation, vacuum hose degradation affecting various systems (climate control, engine management), door lock actuator failure, convertible top hydraulic leaks, catalytic converter failure, and potential for rust on older examples.

📚 Vehicle History

Brand Heritage:

Mercedes-Benz has a long-standing reputation for luxury, engineering excellence, and safety, with a lineage of iconic roadsters dating back to the 1950s.

Model Evolution:

The R129 SL-Class succeeded the R107 generation and was produced from 1989 to 2001. The SL500 was a prominent model within this generation, known for its powerful V8 engine and refined chassis.

Production Years:

1989-2001 (R129 generation). The SL500 variant specifically was introduced in 1990 and continued through 2001.

Manufacturing Location:

Sindelfingen, Germany

🏆 Awards & Recognition

Recognitions:

While specific awards for the 1994 model year are not commonly highlighted, the R129 SL-Class as a generation was widely praised for its engineering, safety, and luxury. It was often considered one of the finest grand touring convertibles of its time.