The 1990 Mercedes-Benz SL-Class, specifically the R129 generation introduced in 1989, is a luxurious two-door convertible grand tourer. It succeeded the beloved R107 SL. Key trims include the 300 SL and 500 SL. Known for its sophisticated engineering, robust build, and elegant design, the R129 SL garnered popularity for its blend of performance and everyday usability, making it a desirable status symbol.
The Good
The 1990 SL-Class boasts excellent build quality, a supremely comfortable ride, and timeless design appealing to the senses. Practically, its strong engineering promises reliability and longevity, offering a secure and refined driving experience for discerning owners.
The Bad
Potential weaknesses include aging electrical components, particularly wiring harnesses and the convertible top hydraulic system. Rust can be an issue in certain areas. Maintenance can be costly, and finding specialized mechanics is crucial for proper upkeep.
1990 Mercedes-Benz SL-Class: Quick Overview
- Engine Options: For 1990, the R129 SL-Class was primarily offered with two engine choices:
- 3.0L Inline-6 (M104): Found in the 300 SL-24 model.
- 5.0L V8 (M119): Found in the 500 SL model.
- Horsepower:
- 300 SL-24: Approximately 228 horsepower.
- 500 SL: Approximately 322 horsepower.
- Fuel Economy: These are approximate figures and vary significantly with driving conditions and engine variant.
- 300 SL-24: Around 16 mpg city / 20 mpg highway.
- 500 SL: Around 13 mpg city / 17 mpg highway.
- 0-60 Times:
- 300 SL-24: Roughly 8.0 - 8.5 seconds.
- 500 SL: Approximately 6.0 - 6.5 seconds.
- Towing Capacity: The SL-Class is not designed for towing; therefore, towing capacity is not applicable.
- Trim-Level Features (General for 1990 R129):
- Standard Features Across Both:
- Power-operated soft top with hardtop included.
- Anti-lock Braking System (ABS).
- Driver and passenger airbags.
- Automatic climate control.
- Leather upholstery.
- Power windows, mirrors, and seats.
- Cruise control.
- Limited-slip differential (often standard on V8 models).
- Roll bar that automatically deploys in case of a rollover.
- 500 SL Specific Features (Often optional or enhanced on 300 SL):
- More potent V8 engine.
- Potentially sportier suspension tuning.
- Higher-grade interior materials.
- Optional heated seats.
- Optional Bose sound system.
1990 Mercedes-Benz SL-Class Specifications
Vehicle Information
| Year | 1990 |
| Make | Mercedes-Benz |
| Model | SL-Class |
| Trim | - |
| Style | - |
| Type | Convertible |
| Category | Sports Car |
Manufacturing Details
| Made In | Germany |
| Manufacturing City | BREMEN |
Dimensions
| Doors | 2-Door |
| Curb Weight | 4145 pounds |
| Gross Vehicle Weight Rating | - |
| Overall Height | 50.70 inches |
| Overall Length | 176.00 inches |
| Overall Width | 71.30 inches |
| Wheelbase Length | 99.00 inches |
| Standard Seating | 2 |
Engine & Performance
| Engine | 5.0-L V-8 DOHC 32V |
| Engine Size | 5L |
| Engine Cylinders | 8 |
| Transmission | 4-Speed Automatic |
| Transmission Type | Automatic |
| Transmission Speeds | 4-Speed |
| Drivetrain | Rear-Wheel Drive |
Additional Features
| Anti-Brake System | 4-Wheel ABS |
| Steering Type | Recirculating |
Pricing
| Manufacturer Suggested Retail Price (MSRP) | $83,500 |
| Invoice Price | - |
| Delivery Charges | - |
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What Problems Does the 1990 Mercedes-Benz SL-Class Have?
The 1990 Mercedes-Benz SL-Class, being part of the R129 generation, is generally known for its robust engineering. However, like any vehicle of this age, it has its common issues. One of the most frequently reported problems pertains to the convertible top hydraulic system. Over time, seals can degrade, leading to leaks and a malfunctioning automatic roof. This system is complex and can be expensive to repair if components fail. Another significant concern is the aging wiring harness. Mercedes-Benz vehicles from this era sometimes used wiring insulation that degrades over time, leading to electrical gremlins, intermittent failures of various systems, and potential short circuits. This can manifest in non-functioning gauges, power window issues, or problems with the climate control.
The engine control unit (ECU) can also be a point of failure, although less common than electrical or hydraulic issues. Another area to watch out for is rust, particularly around the wheel arches, rocker panels, and the undercarriage. While generally well-protected, age and exposure to harsh climates can take their toll. The transmission, while typically durable, can develop issues if not properly maintained, with some owners reporting occasional harsh shifting or slippage.
Specific to the 1990 model year, it's an early iteration of the R129 platform. While Mercedes-Benz ironed out many kinks in subsequent years, some early production quirks might be more prevalent. However, no widespread model-year specific recalls affecting major components are prominently noted for 1990 models that differ drastically from general R129 concerns. Long-term reliability is highly dependent on maintenance history. Meticulous servicing, adherence to Mercedes-Benz's recommended intervals, and prompt attention to any developing issues are paramount for maintaining these vehicles.
The engine control unit (ECU) can also be a point of failure, although less common than electrical or hydraulic issues. Another area to watch out for is rust, particularly around the wheel arches, rocker panels, and the undercarriage. While generally well-protected, age and exposure to harsh climates can take their toll. The transmission, while typically durable, can develop issues if not properly maintained, with some owners reporting occasional harsh shifting or slippage.
Specific to the 1990 model year, it's an early iteration of the R129 platform. While Mercedes-Benz ironed out many kinks in subsequent years, some early production quirks might be more prevalent. However, no widespread model-year specific recalls affecting major components are prominently noted for 1990 models that differ drastically from general R129 concerns. Long-term reliability is highly dependent on maintenance history. Meticulous servicing, adherence to Mercedes-Benz's recommended intervals, and prompt attention to any developing issues are paramount for maintaining these vehicles.
How long will the 1990 Mercedes-Benz SL-Class last?
Based on owner data and typical maintenance habits, a well-maintained 1990 Mercedes-Benz SL-Class can easily surpass 200,000 miles and continue to provide reliable service for many more years. These vehicles were built with exceptional engineering and high-quality materials, designed for longevity. The long-term durability is a testament to their construction. However, weaknesses that emerge over time, primarily related to the aging electrical systems and hydraulic components (especially the convertible top), require diligent attention and can necessitate significant repairs if neglected. Regular, preventative maintenance is key to unlocking their extended service life, demonstrating that with proper care, they can be remarkably durable.
What Technology & Safety Features are Included?
The 1990 Mercedes-Benz SL-Class, while a product of its time, offered a respectable suite of technology and safety features, prioritizing driver and passenger well-being and convenience. Standard safety equipment included dual front airbags and an Anti-lock Braking System (ABS), which was considered advanced for the era. A standout safety feature was the automatically deploying roll bar, a significant innovation that provided crucial protection in rollover incidents.
Inside, the technology focused on comfort and convenience. Standard features typically included automatic climate control, power-adjustable front seats (often with memory settings for the driver), power windows, power mirrors, and cruise control. The sound system was usually a premium AM/FM stereo with a cassette player, though specific audio brands and features could vary.
Optional features added further luxury and technological sophistication. These could include heated front seats, a limited-slip differential for enhanced traction (especially on V8 models), and sometimes a more advanced sound system. While dedicated infotainment screens and sophisticated driver-assistance systems like adaptive cruise control or lane departure warnings were non-existent, the SL-Class provided a highly refined and insulated cabin experience, making long journeys comfortable.
Regarding crash-test ratings, specific ratings for the 1990 model year are not as readily available or standardized as modern NHTSA or IIHS tests. However, Mercedes-Benz has historically prioritized safety, and the R129 SL was designed with robust structural integrity, crumple zones, and advanced safety restraints for its time. Its solid construction and inherent engineering contributed to a high level of occupant protection compared to many contemporary vehicles.
Inside, the technology focused on comfort and convenience. Standard features typically included automatic climate control, power-adjustable front seats (often with memory settings for the driver), power windows, power mirrors, and cruise control. The sound system was usually a premium AM/FM stereo with a cassette player, though specific audio brands and features could vary.
Optional features added further luxury and technological sophistication. These could include heated front seats, a limited-slip differential for enhanced traction (especially on V8 models), and sometimes a more advanced sound system. While dedicated infotainment screens and sophisticated driver-assistance systems like adaptive cruise control or lane departure warnings were non-existent, the SL-Class provided a highly refined and insulated cabin experience, making long journeys comfortable.
Regarding crash-test ratings, specific ratings for the 1990 model year are not as readily available or standardized as modern NHTSA or IIHS tests. However, Mercedes-Benz has historically prioritized safety, and the R129 SL was designed with robust structural integrity, crumple zones, and advanced safety restraints for its time. Its solid construction and inherent engineering contributed to a high level of occupant protection compared to many contemporary vehicles.
What Colors Options are Available?
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1990 Mercedes-Benz SL-Class Prices and Market Value
When new, the 1990 Mercedes-Benz SL-Class was a premium luxury vehicle with a significant price tag. The 300 SL typically started in the high $60,000s, while the more powerful 500 SL could command well over $80,000. These prices reflected its sophisticated engineering and luxury appointments.
Today, the used market prices for a 1990 SL-Class can range widely, from around $5,000 for project cars to $20,000 or more for exceptionally well-maintained examples with low mileage and extensive service history. Depreciation has been substantial, as is typical for luxury cars, but the R129 generation has shown resilience, with values stabilizing and even increasing for pristine specimens. Factors affecting resale value include condition, mileage, maintenance records, originality, and trim level. A well-documented service history is paramount for commanding higher prices. Rust and major mechanical issues significantly depress value.
Today, the used market prices for a 1990 SL-Class can range widely, from around $5,000 for project cars to $20,000 or more for exceptionally well-maintained examples with low mileage and extensive service history. Depreciation has been substantial, as is typical for luxury cars, but the R129 generation has shown resilience, with values stabilizing and even increasing for pristine specimens. Factors affecting resale value include condition, mileage, maintenance records, originality, and trim level. A well-documented service history is paramount for commanding higher prices. Rust and major mechanical issues significantly depress value.
1990 Mercedes-Benz SL-Class Cost of Ownership
Owning a 1990 Mercedes-Benz SL-Class is generally considered costly rather than economical. Insurance premiums can be moderate to high, depending on your driving record and location, as it's a luxury classic. Fuel economy, particularly for the V8, is below average. Maintenance is a significant expense; while reliable if maintained, parts and labor from Mercedes-Benz specialists or dealerships are premium. Repairs, especially for the convertible top hydraulics or electrical systems, can be substantial. Long-term ownership requires a budget for preventative care and potential unexpected issues, making it a vehicle for enthusiasts willing to invest in its upkeep.
1990 Mercedes-Benz SL-Class Fuel Efficiency
Fuel Type
Gasoline
Fuel Capacity
21.10 gallons
City Mileage
14 miles/gallon
Highway Mileage
18 miles/gallon
1990 Mercedes-Benz SL-Class Safety Rating
NHTSA
IIHS
1990 Mercedes-Benz SL-Class Warranty
Basic
Original warranty
0 months / No data
Estimated remaining
Expired
Powertrain
Original warranty
0 months / No data
Estimated remaining
Expired
Rust
Original warranty
0 months / No data
Estimated remaining
Expired
1990 Mercedes-Benz SL-Class Insurance
Insurance for a 1990 Mercedes-Benz SL-Class is moderately priced, reflecting its status as a Convertible with strong safety ratings and
reasonable repair costs.
reasonable repair costs.
How Does the 1990 Mercedes-Benz SL-Class Compare to Other Convertible?
In 1990, the Mercedes-Benz SL-Class (R129) competed in a rarefied segment against luxury convertibles and grand tourers like the Porsche 911 Cabriolet, BMW 8 Series (though a coupe initially), Jaguar XJS, and perhaps even higher-end models from Cadillac.
Performance: The 500 SL, with its V8, offered strong performance that rivaled or surpassed many competitors, particularly in acceleration. The 300 SL was competent but less performance-oriented than the 500. The Porsche 911 offered superior outright sportiness and handling, while the Jaguar XJS was more of a relaxed cruiser.
Features: The SL-Class excelled in luxury and build quality. Its standard features, including the automatic hardtop/soft top mechanism and advanced safety systems for the time, were often class-leading. The interior was meticulously crafted, offering a sense of substantial luxury that might have been more spartan in the Porsche or more dated in the Jaguar. The BMW 8 Series, when it arrived, offered more advanced technology.
Reliability: Mercedes-Benz has a reputation for robust engineering, and the R129 SL-Class is generally considered more reliable than many European counterparts of the era, especially when compared to certain Jaguars or early BMW electronics. However, as noted, age brings specific electrical and hydraulic challenges. The Porsche 911 has its own well-documented maintenance quirks.
Price: The SL-Class was positioned at the premium end, comparable to other high-end luxury offerings. New prices were steep, and today, while appreciating, it remains more accessible than a pristine Porsche 911 of the same vintage.
Alternatives:
Similar: For those seeking a luxury convertible with a focus on comfort and build quality, the BMW 8 Series convertible (when it arrived) or certain later Jaguar XJS models (especially the V12s for sheer presence) are comparable, though perhaps less mechanically complex.
Better (depending on priorities): If outright performance and driving dynamics are paramount, a Porsche 911 Cabriolet would be a sportier choice. If the budget is more constrained and a stylish convertible is desired, a well-maintained Jaguar XJS offers a different flavor of British luxury. However, for a blend of V8 power, enduring luxury, and sophisticated presence, the 1990 Mercedes-Benz 500 SL remains a compelling choice.
Performance: The 500 SL, with its V8, offered strong performance that rivaled or surpassed many competitors, particularly in acceleration. The 300 SL was competent but less performance-oriented than the 500. The Porsche 911 offered superior outright sportiness and handling, while the Jaguar XJS was more of a relaxed cruiser.
Features: The SL-Class excelled in luxury and build quality. Its standard features, including the automatic hardtop/soft top mechanism and advanced safety systems for the time, were often class-leading. The interior was meticulously crafted, offering a sense of substantial luxury that might have been more spartan in the Porsche or more dated in the Jaguar. The BMW 8 Series, when it arrived, offered more advanced technology.
Reliability: Mercedes-Benz has a reputation for robust engineering, and the R129 SL-Class is generally considered more reliable than many European counterparts of the era, especially when compared to certain Jaguars or early BMW electronics. However, as noted, age brings specific electrical and hydraulic challenges. The Porsche 911 has its own well-documented maintenance quirks.
Price: The SL-Class was positioned at the premium end, comparable to other high-end luxury offerings. New prices were steep, and today, while appreciating, it remains more accessible than a pristine Porsche 911 of the same vintage.
Alternatives:
Similar: For those seeking a luxury convertible with a focus on comfort and build quality, the BMW 8 Series convertible (when it arrived) or certain later Jaguar XJS models (especially the V12s for sheer presence) are comparable, though perhaps less mechanically complex.
Better (depending on priorities): If outright performance and driving dynamics are paramount, a Porsche 911 Cabriolet would be a sportier choice. If the budget is more constrained and a stylish convertible is desired, a well-maintained Jaguar XJS offers a different flavor of British luxury. However, for a blend of V8 power, enduring luxury, and sophisticated presence, the 1990 Mercedes-Benz 500 SL remains a compelling choice.
Final Verdict: Is the 1990 Mercedes-Benz SL-Class a Good Convertible?
The 1990 Mercedes-Benz SL-Class is ideal for the discerning enthusiast who appreciates timeless design, robust engineering, and luxurious comfort, and is willing to invest in its ongoing care. It's worth buying for those seeking a classic grand tourer that offers a blend of performance (especially the 500 SL) and daily usability without the extreme track-focused nature of some sports cars.
Buying used is the only option. The 500 SL trim is generally more desirable due to its V8 power. It is crucial to buy a well-maintained example with a comprehensive service history. Be prepared for potential maintenance costs related to the convertible top and electrical systems, as these are common weak points. For buyers who can afford and manage these aspects, the R129 SL offers enduring style and a rewarding ownership experience.
Buying used is the only option. The 500 SL trim is generally more desirable due to its V8 power. It is crucial to buy a well-maintained example with a comprehensive service history. Be prepared for potential maintenance costs related to the convertible top and electrical systems, as these are common weak points. For buyers who can afford and manage these aspects, the R129 SL offers enduring style and a rewarding ownership experience.
Simon A
Simon is a contributor to VinCheck, where he provides articles and reviews on various automotive topics. His work focuses on delivering accurate and up-to-date information about used cars, helping readers make informed decisions.