The 1999 Mercedes-Benz SL-Class, specifically the R129 generation which spanned from 1989 to 2002, represents a pinnacle of German engineering and luxury motoring. This two-door convertible roadster was a symbol of prestige and performance. Key trims included the SL320, SL500, and the potent SL600. Popularity stemmed from its sophisticated design, robust build quality, and the iconic Mercedes-Benz badge, offering a blend of exhilarating driving and refined comfort. Its pricing when new placed it firmly in the luxury segment.
The Good
The 1999 SL-Class offers a thrilling driving experience with potent V8 and V12 engines, coupled with renowned Mercedes-Benz reliability. Its opulent interior provides unparalleled comfort, while the timeless design appeals to those seeking automotive artistry. Practical buyers appreciate its enduring build quality, making it a sound investment for long-term enjoyment.
The Bad
Owners should watch out for potential issues with the retractable hardtop mechanism, electrical gremlins, and aging suspension components. Corrosion can be a concern on older examples, particularly in the wheel arches and sills. Regular maintenance is crucial to prevent more significant and costly repairs down the line.
1999 Mercedes-Benz SL-Class: Quick Overview
- Engine Options: The 1999 Mercedes-Benz SL-Class was offered with a choice of robust gasoline engines. The most common were the 3.2-liter inline-six in the SL320, the 4.9-liter V8 in the SL500, and the 6.0-liter V12 in the SL600.
- Horsepower:
- SL320: Approximately 228 horsepower.
- SL500: Approximately 302 horsepower.
- SL600: Approximately 389 horsepower. - Fuel Economy: As expected for a luxury performance car of this era, fuel economy was not a primary focus. Combined MPG ratings typically ranged from 14-17 MPG, with city driving significantly lower.
- 0-60 Times:
- SL320: Around 7.5-8.0 seconds.
- SL500: Around 6.1-6.5 seconds.
- SL600: Around 5.5-5.9 seconds. - Towing Capacity: The Mercedes-Benz SL-Class is not designed for towing, and towing capacity is not applicable.
- Trim-Level Features:
- SL320: Typically featured leather upholstery, power-adjustable seats with memory, automatic climate control, a premium sound system, ABS, traction control, and dual front airbags.
- SL500: Added to the SL320's features with a more powerful V8 engine, often including xenon headlights, a Bose sound system, and sometimes upgraded interior trim.
- SL600: Represented the pinnacle of luxury and performance, with the potent V12 engine, adaptive suspension (Active Body Control or ABC on later R129 models), heated seats, and exclusive interior materials. All models featured the innovative retractable hardtop, offering both coupe and convertible driving experiences.
1999 Mercedes-Benz SL-Class Specifications
Vehicle Information
| Year | 1999 |
| Make | Mercedes-Benz |
| Model | SL-Class |
| Trim | - |
| Style | - |
| Type | Cabriolet |
| Category | Compact Car |
Manufacturing Details
| Made In | Germany |
| Manufacturing City | GRAZ |
Dimensions
| Doors | 2-Door |
| Curb Weight | - |
| Gross Vehicle Weight Rating | - |
| Overall Height | - |
| Overall Length | - |
| Overall Width | - |
| Wheelbase Length | - |
| Standard Seating | - |
Engine & Performance
| Engine | MB |
| Engine Size | 5L |
| Engine Cylinders | 8 |
| Transmission | - |
| Transmission Type | - |
| Transmission Speeds | - |
| Drivetrain | Rear-Wheel Drive |
Additional Features
| Anti-Brake System | - |
| Steering Type | - |
Pricing
| Manufacturer Suggested Retail Price (MSRP) | - |
| Invoice Price | - |
| Delivery Charges | - |
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What Problems Does the 1999 Mercedes-Benz SL-Class Have?
The 1999 Mercedes-Benz SL-Class, while generally well-built, is not immune to common issues that can arise with age and mileage. One of the most frequently reported and potentially costly problems revolves around the complex retractable hardtop system. The hydraulic lines can develop leaks, the motors and pumps can fail, and the seals can degrade, leading to water ingress and difficult operation. Early models of the R129 generation sometimes experienced issues with the SRS (Supplemental Restraint System) warning light staying on due to faulty seat occupancy sensors or module failures. Another common area for concern is the electronic climate control system; the blower motor regulator and various sensors can fail, leading to inconsistent or non-existent airflow. Suspension components, such as bushings and ball joints, can wear over time, impacting ride quality and handling. The MAF (Mass Airflow) sensor is another component that can become a point of failure, leading to rough idling and poor performance. While there weren't widespread recalls specific to the 1999 model year that are commonly cited as major issues, routine maintenance items like coolant leaks, transmission issues (especially on higher mileage examples), and ignition system problems can occur. Owners of these vehicles should be prepared for the possibility of electrical gremlins, which can be notoriously difficult and expensive to diagnose and repair on these sophisticated cars. Long-term reliability is heavily dependent on consistent and diligent maintenance by qualified technicians. Neglected maintenance can exacerbate many of these issues, leading to cascading failures and significant repair bills. While the engines and transmissions are generally robust, the ancillary systems, particularly the electronics and the convertible top mechanism, are the primary areas of concern for owners of a 1999 SL-Class.
How long will the 1999 Mercedes-Benz SL-Class last?
Based on owner data and typical maintenance habits, a 1999 Mercedes-Benz SL-Class can reasonably be expected to provide many years of service, often exceeding 150,000 to 200,000 miles. However, its long-term durability is directly proportional to the quality and consistency of its maintenance. Cars that have been meticulously serviced at Mercedes-Benz specialist shops or dealerships tend to fare much better. The robust underlying mechanicals, particularly the engines and transmissions, are known for their longevity. The primary weaknesses that emerge over time are related to the complex convertible top hydraulics and electronics, which can become a recurring expense. Suspension components and minor electrical issues also tend to surface with age and higher mileage. With proper care, the SL-Class demonstrates impressive long-term structural integrity and driver appeal, but owners must be prepared for the specialized maintenance it requires.
What Technology & Safety Features are Included?
The 1999 Mercedes-Benz SL-Class, while not boasting the expansive digital interfaces of modern vehicles, offered a sophisticated suite of technology and safety features for its era. Standard safety equipment included anti-lock brakes (ABS), traction control (ASR), dual front airbags, and side-impact protection. The R129 SL also pioneered the automatically deploying rollover bar, which would spring up instantly in the event of a detected rollover.
In terms of built-in tech and entertainment, the 1999 SL typically came with a premium sound system, often a Bose unit on higher trims, with an in-dash cassette player and a CD changer located in the trunk. Power windows, power-adjustable seats with memory settings, and automatic climate control were standard, ensuring a comfortable and convenient driving experience. The centerpiece of the interior technology was the electro-hydraulic retractable hardtop, a marvel of engineering that transformed the car from a coupe to a convertible with the touch of a button.
Optional features could include heated seats, which were particularly welcome in a convertible for year-round usability. Xenon headlights were also an option on some models, providing superior nighttime illumination. Advanced driver-assistance systems as we know them today were largely absent, but the inclusion of ABS and traction control was cutting-edge for the late 1990s.
Crash-test ratings for vehicles of this vintage are not as comprehensively documented or standardized as they are today. However, Mercedes-Benz has a long-standing reputation for engineering robust and safe vehicles, and the SL-Class was built to stringent safety standards, incorporating a strong unibody structure and advanced safety systems for its time. Its advanced safety features were a significant selling point, emphasizing occupant protection alongside luxury and performance.
In terms of built-in tech and entertainment, the 1999 SL typically came with a premium sound system, often a Bose unit on higher trims, with an in-dash cassette player and a CD changer located in the trunk. Power windows, power-adjustable seats with memory settings, and automatic climate control were standard, ensuring a comfortable and convenient driving experience. The centerpiece of the interior technology was the electro-hydraulic retractable hardtop, a marvel of engineering that transformed the car from a coupe to a convertible with the touch of a button.
Optional features could include heated seats, which were particularly welcome in a convertible for year-round usability. Xenon headlights were also an option on some models, providing superior nighttime illumination. Advanced driver-assistance systems as we know them today were largely absent, but the inclusion of ABS and traction control was cutting-edge for the late 1990s.
Crash-test ratings for vehicles of this vintage are not as comprehensively documented or standardized as they are today. However, Mercedes-Benz has a long-standing reputation for engineering robust and safe vehicles, and the SL-Class was built to stringent safety standards, incorporating a strong unibody structure and advanced safety systems for its time. Its advanced safety features were a significant selling point, emphasizing occupant protection alongside luxury and performance.
What Colors Options are Available?
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1999 Mercedes-Benz SL-Class Prices and Market Value
When new, the 1999 Mercedes-Benz SL-Class was a significant luxury purchase. The SL320 typically started in the mid-$80,000s, while the SL500 commanded prices upwards of $95,000, and the flagship SL600 could easily exceed $120,000.
Today, used market prices for a 1999 SL-Class vary considerably based on condition, mileage, and trim level. Well-maintained examples can range from $15,000 to $30,000 or more, with the SL600 often fetching higher figures. These vehicles have experienced substantial depreciation from their original MSRPs. Factors affecting resale value include meticulous maintenance history, low mileage, the condition of the convertible top and its mechanisms, interior and exterior cosmetic appeal, and originality of components. Cars with documented service records and in excellent mechanical and cosmetic condition will always command a premium.
Today, used market prices for a 1999 SL-Class vary considerably based on condition, mileage, and trim level. Well-maintained examples can range from $15,000 to $30,000 or more, with the SL600 often fetching higher figures. These vehicles have experienced substantial depreciation from their original MSRPs. Factors affecting resale value include meticulous maintenance history, low mileage, the condition of the convertible top and its mechanisms, interior and exterior cosmetic appeal, and originality of components. Cars with documented service records and in excellent mechanical and cosmetic condition will always command a premium.
1999 Mercedes-Benz SL-Class Cost of Ownership
Owning a 1999 Mercedes-Benz SL-Class is undeniably a costly endeavor. Insurance premiums will be higher due to the vehicle's luxury status and replacement value. Fuel costs are significant, with V8 and V12 engines consuming premium unleaded at a considerable rate. Maintenance is specialized and expensive; routine servicing by a Mercedes-Benz specialist or dealership is recommended, adding to the cost. Repairs, particularly those involving the complex convertible top or electronics, can be very steep. This vehicle is not economical to own; it is a costly, albeit rewarding, luxury car that requires a substantial budget for ongoing upkeep.
1999 Mercedes-Benz SL-Class Fuel Efficiency
Fuel Type
Gasoline
Fuel Capacity
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City Mileage
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Highway Mileage
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1999 Mercedes-Benz SL-Class Insurance
Insurance for a 1999 Mercedes-Benz SL-Class is moderately priced, reflecting its status as a Cabriolet with strong safety ratings and
reasonable repair costs.
reasonable repair costs.
How Does the 1999 Mercedes-Benz SL-Class Compare to Other Cabriolet?
In 1999, the Mercedes-Benz SL-Class competed in a segment of high-end luxury convertibles. Key rivals included the Porsche 911 Cabriolet, BMW 8 Series Convertible (though nearing the end of its run and more of a grand tourer), and potentially the Jaguar XK8 Convertible.
Performance: The SL500 and SL600 offered substantial V8 and V12 power, respectively, providing effortless acceleration and smooth cruising, aligning with Mercedes-Benz's grand touring ethos. The Porsche 911 Cabriolet, with its rear-engine configuration, offered a more visceral and engaging driving experience, particularly on twisty roads, often with superior handling dynamics. The Jaguar XK8 provided a more classically sporting feel with its potent V8.
Features: The SL-Class excelled in luxury and comfort features, with its robust retractable hardtop being a standout. It offered a high level of interior refinement and technological amenities for its time. The Porsche 911 emphasized driver-focused features and a more minimalist interior compared to the Mercedes. The Jaguar offered a plush interior with a focus on classic British luxury.
Reliability: Mercedes-Benz had a strong reputation for build quality, but the R129 SL's complex convertible top and electronics could present challenges. Porsche 911s of this era, while generally reliable, could also be costly to maintain. Jaguar's reliability, historically, has been more variable than German counterparts.
Price: The 1999 SL-Class was priced competitively within this elite segment, often offering a more accessible entry point than a similarly equipped Porsche 911.
Alternatives: For those seeking a more engaging driving experience and potentially better handling, a 1999 Porsche 911 Cabriolet (996 generation) would be a strong contender, though likely more expensive. A 1999 Jaguar XK8 Convertible offers a stylish and luxurious alternative with a distinct character. If the primary focus is sheer luxury and a comfortable open-top experience with a more understated presence, the SL-Class remains a compelling choice. However, for enthusiasts prioritizing dynamic performance and handling, the Porsche 911 is often the preferred option, albeit with potentially higher maintenance costs.
Performance: The SL500 and SL600 offered substantial V8 and V12 power, respectively, providing effortless acceleration and smooth cruising, aligning with Mercedes-Benz's grand touring ethos. The Porsche 911 Cabriolet, with its rear-engine configuration, offered a more visceral and engaging driving experience, particularly on twisty roads, often with superior handling dynamics. The Jaguar XK8 provided a more classically sporting feel with its potent V8.
Features: The SL-Class excelled in luxury and comfort features, with its robust retractable hardtop being a standout. It offered a high level of interior refinement and technological amenities for its time. The Porsche 911 emphasized driver-focused features and a more minimalist interior compared to the Mercedes. The Jaguar offered a plush interior with a focus on classic British luxury.
Reliability: Mercedes-Benz had a strong reputation for build quality, but the R129 SL's complex convertible top and electronics could present challenges. Porsche 911s of this era, while generally reliable, could also be costly to maintain. Jaguar's reliability, historically, has been more variable than German counterparts.
Price: The 1999 SL-Class was priced competitively within this elite segment, often offering a more accessible entry point than a similarly equipped Porsche 911.
Alternatives: For those seeking a more engaging driving experience and potentially better handling, a 1999 Porsche 911 Cabriolet (996 generation) would be a strong contender, though likely more expensive. A 1999 Jaguar XK8 Convertible offers a stylish and luxurious alternative with a distinct character. If the primary focus is sheer luxury and a comfortable open-top experience with a more understated presence, the SL-Class remains a compelling choice. However, for enthusiasts prioritizing dynamic performance and handling, the Porsche 911 is often the preferred option, albeit with potentially higher maintenance costs.
Final Verdict: Is the 1999 Mercedes-Benz SL-Class a Good Cabriolet?
The 1999 Mercedes-Benz SL-Class is ideal for the discerning buyer who values sophisticated design, opulent comfort, and relaxed performance in a luxurious convertible. It's perfect for those who appreciate timeless styling and the prestige of the Mercedes-Benz brand, and who don't mind the associated ownership costs.
It is worth buying, but only under specific conditions. As a new car, it was prohibitively expensive; today, as a used vehicle, it represents a potential luxury bargain if one is prepared for the maintenance. Buyers should target well-maintained examples, ideally with lower mileage and a documented service history. The SL500 is often considered the sweet spot, offering a great balance of power and refinement without the extreme complexity or cost of the SL600. Thorough pre-purchase inspections, focusing on the convertible top and electrical systems, are essential. It's a car for someone who wants a stylish grand tourer and has the budget for its upkeep.
It is worth buying, but only under specific conditions. As a new car, it was prohibitively expensive; today, as a used vehicle, it represents a potential luxury bargain if one is prepared for the maintenance. Buyers should target well-maintained examples, ideally with lower mileage and a documented service history. The SL500 is often considered the sweet spot, offering a great balance of power and refinement without the extreme complexity or cost of the SL600. Thorough pre-purchase inspections, focusing on the convertible top and electrical systems, are essential. It's a car for someone who wants a stylish grand tourer and has the budget for its upkeep.
Drew B
Drew is a seasoned automotive expert and contributor to VinCheck.info. With nearly 15 years of experience as a former Porsche technician, he brings a wealth of hands-on knowledge to his writing. Born in North Carolina, a region renowned for its deep-rooted NASCAR culture, Drew developed a passion for cars early in life, often building and working on vehicles from a young age. At VINCheck, Drew leverages his extensive technical background to provide in-depth analyses of various vehicles. His articles often focus on engine performance, reliability, and maintenance insights, offering readers practical information grounded in real-world experience. Some of his notable contributions include reviews on the Mazda CX-5's longevity and detailed examinations of engine options for models like the 2011 Toyota Camry and Tacoma