The 1998 Mercedes-Benz SL-Class, part of the R129 generation (1990-2002), represents a pinnacle of luxury roadster design and engineering. This elegant two-door convertible, featuring a power-retractable soft top and an optional removable hardtop, was available in key trims like the inline-six SL320, the powerful V8 SL500, and the magnificent V12 SL600. Originally priced from approximately $79,000 to over $130,000, its timeless styling, robust build quality, and advanced safety features made it a standout and enduringly popular choice among luxury car enthusiasts.
The Good
The 1998 SL-Class boasts an iconic, elegant design and impressive performance, especially with its potent V8 and V12 engines, appealing to emotional buyers seeking prestige and open-air driving pleasure. Practically, it offers exceptional comfort, a remarkably solid build, and a surprising long-term value for a luxury grand tourer, provided it's well-maintained. Its robust engineering contributes to a luxurious and generally reliable motoring experience.
The Bad
Potential buyers should watch out for complex hydraulic issues, particularly with the convertible top mechanism and Active Damping System (ADS), which can be costly to repair. Electrical gremlins, including wiring harness degradation and module failures, are also common as the car ages. Furthermore, high maintenance costs due to specialized parts and labor are significant drawbacks, as is the relatively poor fuel economy of the V8 and V12 models.
1998 Mercedes-Benz SL-Class: Quick Overview
- Engine Options:
- SL320: Equipped with a 3.2-liter DOHC 24-valve inline-six engine (M104).
- SL500: Features a 5.0-liter SOHC 32-valve V8 engine (M119), renowned for its smooth power delivery.
- SL600: The flagship model, powered by a 6.0-liter SOHC 48-valve V12 engine (M120), offering substantial power and refinement. - Horsepower:
- SL320: Approximately 228 horsepower.
- SL500: Around 315-320 horsepower.
- SL600: Roughly 389-394 horsepower. - Fuel Economy (Estimated Combined EPA):
- SL320: Around 18-20 MPG.
- SL500: Approximately 15-17 MPG.
- SL600: Roughly 13-15 MPG. Fuel type is premium unleaded for all variants. - 0-60 mph Times (Approximate):
- SL320: 7.5-8.0 seconds.
- SL500: 6.0-6.5 seconds.
- SL600: 5.5-6.0 seconds. - Towing Capacity: Not applicable. The SL-Class is a luxury roadster and not designed or recommended for towing.
- Trim-Level Features:
- Standard luxury features across all trims include leather upholstery, power-adjustable seats with memory, automatic climate control, cruise control, power windows, mirrors, and locks.
- A full power-operated soft top with an electro-hydraulic mechanism was standard, alongside an optional removable aluminum hardtop.
- Safety features included dual front airbags, anti-lock brakes (ABS), and Traction Control (ASR). Electronic Stability Program (ESP) was typically standard on V8/V12 models by 1998.
- Premium audio systems, often a Bose unit, were common. An integrated CD changer was a popular option.
- Optional heated seats and a multifunction steering wheel were available. Xenon headlamps, while becoming more common, were still an exclusive option on some later R129 models. The SL600 often came with most features as standard, including the Adaptive Damping System (ADS) II suspension.
1998 Mercedes-Benz SL-Class Specifications
Vehicle Information
| Year | 1998 |
| Make | Mercedes-Benz |
| Model | SL-Class |
| Trim | - |
| Style | - |
| Type | Cabriolet |
| Category | Compact Car |
Manufacturing Details
| Made In | Germany |
| Manufacturing City | SINDELFINGEN |
Dimensions
| Doors | 2-Door |
| Curb Weight | - |
| Gross Vehicle Weight Rating | - |
| Overall Height | - |
| Overall Length | - |
| Overall Width | - |
| Wheelbase Length | - |
| Standard Seating | - |
Engine & Performance
| Engine | 6.0L V12 |
| Engine Size | 6L |
| Engine Cylinders | 12 |
| Transmission | 5-Speed Automatic |
| Transmission Type | Automatic |
| Transmission Speeds | 5-Speed |
| 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 1998 Mercedes-Benz SL-Class Have?
The 1998 Mercedes-Benz SL-Class, while robustly engineered, has several frequently reported problems that often emerge with age and mileage, leading to significant long-term reliability concerns. A primary issue revolves around the complex electro-hydraulic convertible top system. The numerous hydraulic cylinders (typically 12) are prone to developing leaks over time, requiring expensive rebuilding or replacement. Similarly, the optional Adaptive Damping System (ADS), particularly on SL600 and some SL500 models, can fail, leading to costly strut replacements or system bypasses.
Electrical gremlins are also prevalent. While earlier R129s (pre-1996) suffered from more severe wiring harness degradation due to biodegradable insulation, the 1998 models can still experience issues with various electrical modules, seat memory functions, dashboard gauges, and window regulators. The climate control unit's vacuum elements and actuators can also fail, leading to inconsistent HVAC operation.
Engine-wise, common issues include oil leaks from valve cover gaskets, rear main seals, and power steering pumps. The M119 V8 and M120 V12 engines are mechanically sound but require meticulous maintenance to prevent issues. Transmission conductor plate problems are more common in later Mercedes models, but fluid leaks from the five-speed automatic transmission are not unheard of. Rubber components and bushings throughout the suspension and engine bay inevitably degrade, leading to rattles, vibrations, and diminished ride quality.
Regarding recalls for the 1998 R129, these tend to be specific and less widespread than some contemporary models. Owners should check the NHTSA database using the VIN for any outstanding recalls. Common recall areas for the R129 generation have included issues with the cruise control system (due to a potential for overheating in earlier models), specific wiring harnesses, and seatbelt components. Long-term reliability heavily depends on consistent, specialized maintenance; neglected examples will certainly demonstrate all of these issues and more.
Electrical gremlins are also prevalent. While earlier R129s (pre-1996) suffered from more severe wiring harness degradation due to biodegradable insulation, the 1998 models can still experience issues with various electrical modules, seat memory functions, dashboard gauges, and window regulators. The climate control unit's vacuum elements and actuators can also fail, leading to inconsistent HVAC operation.
Engine-wise, common issues include oil leaks from valve cover gaskets, rear main seals, and power steering pumps. The M119 V8 and M120 V12 engines are mechanically sound but require meticulous maintenance to prevent issues. Transmission conductor plate problems are more common in later Mercedes models, but fluid leaks from the five-speed automatic transmission are not unheard of. Rubber components and bushings throughout the suspension and engine bay inevitably degrade, leading to rattles, vibrations, and diminished ride quality.
Regarding recalls for the 1998 R129, these tend to be specific and less widespread than some contemporary models. Owners should check the NHTSA database using the VIN for any outstanding recalls. Common recall areas for the R129 generation have included issues with the cruise control system (due to a potential for overheating in earlier models), specific wiring harnesses, and seatbelt components. Long-term reliability heavily depends on consistent, specialized maintenance; neglected examples will certainly demonstrate all of these issues and more.
How long will the 1998 Mercedes-Benz SL-Class last?
With proper and consistent maintenance, a 1998 Mercedes-Benz SL-Class can easily achieve 150,000 to 200,000 miles or more, offering many years of enjoyable service. The underlying engines (M104, M119, M120) and transmissions are remarkably robust and durable when cared for. Many examples are still on the road today, a testament to their inherent build quality. However, long-term durability is heavily impacted by the "weaknesses over time" noted earlier. The sophisticated hydraulic convertible top system, complex electrical modules, and advanced suspension components are all susceptible to age-related failures. Rubber and plastic components in the engine bay and suspension will inevitably degrade, requiring replacement. Neglecting these items leads to a cascade of problems and significantly shortens the vehicle's reliable lifespan. While the core mechanicals are strong, the ancillary systems demand attention and budget.
What Technology & Safety Features are Included?
The 1998 Mercedes-Benz SL-Class was a showcase of luxury and technology for its era. Built-in tech features included a sophisticated automatic climate control system, power-adjustable seats with memory functions for both driver and passenger, power windows and mirrors, and cruise control. The instrument cluster provided comprehensive vehicle information, and some models featured a digital display for the climate control. The car's cabin was designed for ultimate comfort and convenience.
For entertainment, the SL-Class typically came equipped with a premium sound system, often a Bose unit, which delivered excellent audio quality. Standard was an AM/FM stereo, and many cars included an in-dash cassette player. An optional trunk-mounted CD changer was a highly sought-after feature, allowing for extended music playback. Steering wheel controls for audio were also commonly found, enhancing driver convenience.
In terms of driver-assistance, the 1998 SL-Class was quite advanced. Anti-lock brakes (ABS) were standard, providing crucial stopping power and control. Traction Control (ASR) was also a standard feature, helping to prevent wheelspin and maintain stability during acceleration. By 1998, the Electronic Stability Program (ESP) was typically standard on the higher-trim SL500 and SL600 models, significantly enhancing vehicle control in challenging driving conditions by selectively applying brakes and reducing engine power. This was a pioneering feature for its time.
Safety features were a major selling point for Mercedes-Benz. The R129 generation was one of the first convertibles to feature a pop-up roll-bar, which automatically deployed in the event of an impending rollover, offering critical head protection. Dual front airbags (driver and passenger) were standard, along with seatbelt pretensioners. Side airbags were not common in convertibles of this era and were generally not present. Crash-test ratings from agencies like NHTSA or IIHS are not available for luxury convertibles of this vintage in the same standardized format as modern vehicles. Optional features included heated seats, a retractable wind deflector, and on later production models, high-intensity discharge (Xenon) headlamps.
For entertainment, the SL-Class typically came equipped with a premium sound system, often a Bose unit, which delivered excellent audio quality. Standard was an AM/FM stereo, and many cars included an in-dash cassette player. An optional trunk-mounted CD changer was a highly sought-after feature, allowing for extended music playback. Steering wheel controls for audio were also commonly found, enhancing driver convenience.
In terms of driver-assistance, the 1998 SL-Class was quite advanced. Anti-lock brakes (ABS) were standard, providing crucial stopping power and control. Traction Control (ASR) was also a standard feature, helping to prevent wheelspin and maintain stability during acceleration. By 1998, the Electronic Stability Program (ESP) was typically standard on the higher-trim SL500 and SL600 models, significantly enhancing vehicle control in challenging driving conditions by selectively applying brakes and reducing engine power. This was a pioneering feature for its time.
Safety features were a major selling point for Mercedes-Benz. The R129 generation was one of the first convertibles to feature a pop-up roll-bar, which automatically deployed in the event of an impending rollover, offering critical head protection. Dual front airbags (driver and passenger) were standard, along with seatbelt pretensioners. Side airbags were not common in convertibles of this era and were generally not present. Crash-test ratings from agencies like NHTSA or IIHS are not available for luxury convertibles of this vintage in the same standardized format as modern vehicles. Optional features included heated seats, a retractable wind deflector, and on later production models, high-intensity discharge (Xenon) headlamps.
What Colors Options are Available?
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In the meantime, feel free to explore the other sections for more content.
In the meantime, feel free to explore the other sections for more content.
1998 Mercedes-Benz SL-Class Prices and Market Value
When new in 1998, the Mercedes-Benz SL-Class carried significant price tags, reflecting its luxury status. The SL320 typically started around $79,000, the SL500 around $89,000, and the range-topping SL600 could exceed $130,000. Like most luxury vehicles, the SL-Class experienced massive initial depreciation, losing a significant portion of its value within the first few years. However, in the current used market, prices have stabilized and even begun to appreciate for exceptional examples.
Today, used market prices vary wildly based on condition, mileage, and maintenance history. A well-preserved SL320 might range from $8,000 to $20,000, while SL500s typically fall between $10,000 and $30,000. Pristine, low-mileage SL600s, especially with full documentation, can command $15,000 to over $40,000, sometimes more for collector-grade examples. Factors significantly affecting resale value include the overall cosmetic and mechanical condition, presence of a full service history, low mileage, rare color combinations, the optional hardtop, and lack of common R129 issues (like hydraulic leaks).
Today, used market prices vary wildly based on condition, mileage, and maintenance history. A well-preserved SL320 might range from $8,000 to $20,000, while SL500s typically fall between $10,000 and $30,000. Pristine, low-mileage SL600s, especially with full documentation, can command $15,000 to over $40,000, sometimes more for collector-grade examples. Factors significantly affecting resale value include the overall cosmetic and mechanical condition, presence of a full service history, low mileage, rare color combinations, the optional hardtop, and lack of common R129 issues (like hydraulic leaks).
1998 Mercedes-Benz SL-Class Cost of Ownership
Owning a 1998 Mercedes-Benz SL-Class is decidedly not economical; it is a costly endeavor. Insurance can be higher than average due to its luxury status and the cost of parts. All models require premium unleaded fuel, and the V8 and V12 engines have notably poor fuel economy, resulting in significant fuel costs. Maintenance, even routine service, is expensive, requiring specialized Mercedes-Benz parts and labor, often best performed by independent specialists. Repairs for common issues like hydraulic leaks, electrical gremlins, or suspension components can quickly run into thousands of dollars. Long-term ownership demands a substantial annual budget for upkeep and unforeseen repairs, making it suitable only for those prepared for premium-level expenses.
1998 Mercedes-Benz SL-Class Fuel Efficiency
Fuel Type
Gasoline
Fuel Capacity
-
City Mileage
16 miles/gallon
Highway Mileage
23 miles/gallon
1998 Mercedes-Benz SL-Class Insurance
Insurance for a 1998 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 1998 Mercedes-Benz SL-Class Compare to Other Cabriolet?
The 1998 Mercedes-Benz SL-Class competed in a prestigious segment against rivals like the Jaguar XK8 Convertible, the Porsche 911 Carrera Cabriolet (993/996 generation), and to some extent, the BMW 8-Series (though a coupe).
In terms of performance, the SL500 and SL600 offered robust straight-line acceleration and effortless grand touring capabilities. The SL600's V12 was exceptionally smooth. However, the Porsche 911 Carrera Cabriolet typically surpassed the SL in pure sports car dynamics, offering sharper handling and a more engaging driving experience, albeit with less outright luxury comfort. The Jaguar XK8, while beautiful, often lagged slightly behind the SL500 in power and felt more akin to a comfortable cruiser.
Regarding features, the SL-Class often set the benchmark for luxury and safety. Its innovative pop-up roll-bar, advanced climate control, and pioneering ESP system (on higher trims) were highly competitive. The XK8 offered similar luxury appointments, while the 911, being more performance-focused, had a comparatively spartan interior. The BMW 8-Series offered similar high-tech features for its coupe body style.
Reliability is a nuanced comparison. While the SL-Class engines are robust, its complex hydraulic and electrical systems are notorious for expensive age-related failures. The Jaguar XK8 also has its share of common issues, particularly with its tensioners and gearbox. The Porsche 911, while expensive to maintain, generally has a reputation for being mechanically stout. For superior reliability, the Lexus SC400 Convertible (if you could find one, as it was primarily a coupe and convertibles were rare and mostly aftermarket) would be a more practical, albeit less prestigious, alternative.
Price when new was comparable across these luxury convertibles. In the current used market, SL-Class models generally offer excellent value for the money given their original cost and engineering. However, the 911 often retains its value better due to its enthusiast appeal. The XK8 can be found for similar or slightly lower prices than an SL.
Alternatives: For a more driver-focused experience, a Porsche Boxster or BMW Z3/Z4 might be better, though smaller and less luxurious. For a similar grand touring experience with potentially lower maintenance headaches (though still high), consider a well-maintained Lexus SC300/400 coupe (convertibles were rare) or an older BMW 840Ci/850Ci for its GT appeal.
In terms of performance, the SL500 and SL600 offered robust straight-line acceleration and effortless grand touring capabilities. The SL600's V12 was exceptionally smooth. However, the Porsche 911 Carrera Cabriolet typically surpassed the SL in pure sports car dynamics, offering sharper handling and a more engaging driving experience, albeit with less outright luxury comfort. The Jaguar XK8, while beautiful, often lagged slightly behind the SL500 in power and felt more akin to a comfortable cruiser.
Regarding features, the SL-Class often set the benchmark for luxury and safety. Its innovative pop-up roll-bar, advanced climate control, and pioneering ESP system (on higher trims) were highly competitive. The XK8 offered similar luxury appointments, while the 911, being more performance-focused, had a comparatively spartan interior. The BMW 8-Series offered similar high-tech features for its coupe body style.
Reliability is a nuanced comparison. While the SL-Class engines are robust, its complex hydraulic and electrical systems are notorious for expensive age-related failures. The Jaguar XK8 also has its share of common issues, particularly with its tensioners and gearbox. The Porsche 911, while expensive to maintain, generally has a reputation for being mechanically stout. For superior reliability, the Lexus SC400 Convertible (if you could find one, as it was primarily a coupe and convertibles were rare and mostly aftermarket) would be a more practical, albeit less prestigious, alternative.
Price when new was comparable across these luxury convertibles. In the current used market, SL-Class models generally offer excellent value for the money given their original cost and engineering. However, the 911 often retains its value better due to its enthusiast appeal. The XK8 can be found for similar or slightly lower prices than an SL.
Alternatives: For a more driver-focused experience, a Porsche Boxster or BMW Z3/Z4 might be better, though smaller and less luxurious. For a similar grand touring experience with potentially lower maintenance headaches (though still high), consider a well-maintained Lexus SC300/400 coupe (convertibles were rare) or an older BMW 840Ci/850Ci for its GT appeal.
Final Verdict: Is the 1998 Mercedes-Benz SL-Class a Good Cabriolet?
The 1998 Mercedes-Benz SL-Class (R129) is ideal for discerning enthusiasts who appreciate classic Mercedes-Benz design, robust engineering, and a luxurious open-air driving experience, and crucially, have a dedicated budget for maintenance. It's perfect for weekend cruising, not as a primary daily driver, unless you're financially robust. This vehicle is worth buying today, but strictly as a used vehicle, as new ones are obviously unavailable. The key condition for purchase is finding an example with comprehensive service records and undergoing a thorough pre-purchase inspection by an R129 specialist. The SL500 often strikes the best balance of power, luxury, and relative simplicity compared to the more complex SL600, making it a generally recommended trim. Avoid neglected or "bargain" cars, as their restoration costs will quickly exceed any initial savings. A well-cared-for SL is a rewarding classic GT.
Cathleen V
Cathleen is an exceptional freelance writer covering hot topics in the automotive world from a gearhead's perspective. Her articles delve into various aspects of automotive technology and history, offering readers detailed insights into engine performance, reliability, and maintenance. Through her engaging and informative writing, Cathleen provides valuable information to automotive enthusiasts and consumers alike, helping them make informed decisions about vehicle maintenance and purchases.