Market Segment:
Luxury Grand Tourer Convertible
Key Competitors:
BMW 8 Series Convertible, Jaguar XJS Convertible, Porsche 911 Targa/Cabriolet
Design Philosophy:
Elegant styling, robust engineering, driver-focused luxury, safety innovation
R129 Distinction:
Introduction of integrated roll bar, significantly improved safety and styling over previous generation (R107)
Engine Mechanical:
Engine assembly, cylinder head, crankshaft, pistons, connecting rods, lubrication system, cooling system, timing components
Engine Management:
Fuel injection (KE-Jetronic/HFM), ignition system, electronic engine control (ECU), emissions control
Transmission Drivetrain:
Automatic transmission (e.g., 722.4, 722.6), final drive, drive shafts, differential
Brakes:
Hydraulic system, ABS (Anti-lock Braking System), caliper, rotor, pad replacement, parking brake
Suspension Steering:
Front and rear suspension components, shock absorbers, springs, control arms, steering gear, power steering system
Electrical Systems:
Wiring diagrams, battery, alternator, starter, lighting system, fuses, relays, instrument cluster
Comfort Convenience:
Climate control (HVAC), power windows, power seats, central locking, convertible top operation, mirrors
Body Chassis:
Body panel removal/installation, bumper, doors, hood, trunk lid, convertible top frame, frame components
Safety Systems:
Airbag system, seat belts
Routine Maintenance:
Oil changes, filter replacements, fluid checks and changes, spark plug replacement, belt inspection/replacement
Troubleshooting:
Diagnostic procedures, fault code interpretation, symptom-based troubleshooting
Major Repairs:
Engine overhaul, transmission overhaul, brake system rebuild, suspension component replacement
Electrical Diagnostics:
Testing circuits, component diagnosis, wiring harness repair
Special Tools:
Identification and usage of Mercedes-Benz specific tools
Depth:
Comprehensive, from basic maintenance to complete engine and transmission rebuilds. Includes detailed diagrams, specifications, and step-by-step instructions.
Digital Format Details:
Searchable PDF with high-resolution diagrams and schematics
Print Quality:
High-quality paper stock with crisp, clear printing for diagrams and text
Binding Type:
Durable binding (e.g., spiral-bound, perfect bound) to withstand workshop use
Paper Type:
Heavy-duty, oil-resistant paper for workshop environments
Engine Options 1995:
M104.941 (3.2L Inline-6), M119.972 (4.2L V8), M119.982 (5.0L V8)
Sl320 Power:
Approximately 228 hp @ 5500 rpm (M104)
Sl500 Power:
Approximately 322 hp @ 5500 rpm (M119)
Sl420 Power:
Approximately 275 hp @ 5500 rpm (M119)
Fuel Injection System:
Bosch LH-Jetronic (later M104) or Bosch HFM (Human-Machine Interface Fuel Management) for V8s, often with KE-Jetronic on earlier models.
M104 Code:
M104.941 (3.2L)
M119 Code 42:
M119.972 (4.2L V8)
M119 Code 50:
M119.982 (5.0L V8)
Transmission Type:
4-speed automatic (722.4) for early models, 5-speed automatic (722.6 'NAG1') introduced later in the R129 lifecycle. For 1995, likely 4-speed automatic.
Manual Transmission:
Not available for R129 SL-Class
Automatic Transmission Modes:
Standard 'S' (Sport) and 'E' (Economy) modes
Automatic Transmission Fluid:
MB 236.1 or 236.3 (e.g., Dexron II)
Crash Test Information:
While formal NHTSA/IIHS ratings for this era are limited, the R129 was renowned for its structural integrity and safety features for its time.
ABS:
Standard Anti-lock Braking System (ABS)
Traction Control:
Optional ASR (Anti-Slip Regulation) on some models
Airbags:
Driver and passenger airbags
Roll Bar:
Automatic, pyrotechnically deployed roll bar behind the seats
Seat Belts:
Pretensioner seat belts
Audio System:
Factory fitted premium sound systems (e.g., Becker/Bose), often with cassette player and CD changer option. Manual may cover head unit and speaker replacement.
Cruise Control:
Standard electronic cruise control system
Telematics:
Limited by era; some models might have had early primitive cellular phone integration (rare). Manual focuses on core vehicle electronics.
Climate Control:
Automatic climate control (often THERMATIC or THERMOTRONIC)
Memory Seats:
Optional power-adjustable seats with memory functions
Oil Change Interval:
Typically every 15,000 km (9,300 miles) or 12 months, whichever comes first. Check manual for specific conditions.
Major Service Interval:
Refer to specific service schedules (e.g., Service A, Service B) which involve more comprehensive checks and replacements, often around 30,000-50,000 km.
Engine Oil Specification:
MB 229.1 or 229.3 (e.g., 0W-40, 5W-40, 5W-30 synthetic or semi-synthetic)
Coolant Specification:
MB 325.0 (Antifreeze/Coolant, blue color, ethylene glycol based)
Brake Fluid Specification:
DOT 4
Power Steering Fluid:
MB 236.3 (Automatic transmission fluid compatible)
Wiring Harness Degradation:
Insulation breakdown (especially 'sheathed' wiring) leading to electrical gremlins. Manual covers diagnosis and repair.
Convertible Top Hydraulics:
Leaks or slow operation of hydraulic cylinders and lines. Manual details repair and bleeding procedures.
Window Regulators:
Common failure of window regulator mechanisms. Manual provides replacement instructions.
Mass Air Flow Sensor:
Potential issues with MAF sensors affecting engine performance. Manual guides testing and replacement.
Ignition Coil Failure:
Especially on M119 V8 engines, ignition coils can fail. Manual covers testing and replacement.
Mercedes Benz Legacy:
Continuity of the SL lineage, known for luxury, performance, and engineering excellence since the 1950s (300SL 'Gullwing').
R129 Introduction:
Introduced in 1989 as a successor to the highly successful R107 SL-Class.
Key R129 Innovations:
The R129 was a significant technological leap, featuring a multi-link rear suspension, a more sophisticated chassis, and the signature automatic roll-over bar.
Production Years:
1989-2001
Manufacturing Location:
Bremen, Germany
