The 1998 Mercedes-Benz S-Class represents the final year of the revered W140 generation, a pinnacle of German automotive engineering. Known for its "over-engineered" philosophy, this full-size luxury sedan (and occasionally coupe) was produced from 1991 to 1998. Key trims included the S320, S420, S500, and the flagship S600. Originally priced from approximately $65,000 to over $130,000, it stood out for its unparalleled build quality, vault-like solidity, and majestic road presence, making it popular among those seeking ultimate luxury and comfort.
The Good
The 1998 S-Class offers an unmatched blend of sublime comfort, robust performance from its powerful engines, and a timeless, imposing design. Its "over-engineered" nature provides a practical sense of security and durability, while the luxurious cabin and smooth ride appeal to emotional desires for prestige and refinement. Though not highly efficient, its current value proposition is compelling.
The Bad
Known weaknesses for the 1998 S-Class include deteriorating engine wiring harnesses, costly HVAC evaporator failures, problematic hydraulic suspension components on higher trims, and various electrical gremlins. Rust can also be an issue, particularly on less well-maintained examples. High parts and labor costs are a significant "watch out."
1998 Mercedes-Benz S-Class: Quick Overview
- Engine Options:
- S320 (SWB/LWB): 3.2L M104 inline-six cylinder engine.
- S420 (LWB only): 4.2L M119 V8 engine.
- S500 (LWB only): 5.0L M119 V8 engine.
- S600 (LWB only): 6.0L M120 V12 engine.
- Horsepower:
- S320: Approximately 228 hp (170 kW).
- S420: Approximately 275 hp (205 kW).
- S500: Approximately 315 hp (235 kW).
- S600: Approximately 389 hp (290 kW).
- Fuel Economy (EPA estimated, combined city/highway):
- S320: Around 18-20 MPG.
- S420: Around 16-18 MPG.
- S500: Around 15-17 MPG.
- S600: Around 13-15 MPG.
- 0-60 MPH Times (approximate):
- S320: 8.9-9.5 seconds.
- S420: 7.0-7.5 seconds.
- S500: 6.5-7.0 seconds.
- S600: 5.5-6.0 seconds.
- Towing Capacity: Not officially rated for significant towing in the U.S. market, though some European models had limited capacity. It's generally not recommended or specified for towing.
- Trim-Level Features (Standard and Optional, often becoming standard on higher trims):
- Automatic climate control (multi-zone on higher trims).
- Leather upholstery.
- Power-adjustable front seats with memory.
- Cruise control.
- Bose premium sound system.
- Power rear sunshade.
- Heated seats (front and rear on S500/S600).
- Soft-close doors and trunk lid.
- Dual-pane insulated glass.
- Electronic Stability Program (ESP) was introduced late in the W140's production, standard on S600, optional on others.
- Adaptive Damping System (ADS) on V8 and V12 models.
- Self-leveling rear suspension (standard on most V8/V12, optional on I6).
- Xenon headlights (optional on some trims).
1998 Mercedes-Benz S-Class Specifications
Vehicle Information
| Year | 1998 |
| Make | Mercedes-Benz |
| Model | S-Class |
| Trim | - |
| Style | - |
| Type | Sedan |
| Category | Compact Car |
Manufacturing Details
| Made In | Germany |
| Manufacturing City | SINDELFINGEN |
Dimensions
| Doors | 4-Door |
| Curb Weight | - |
| Gross Vehicle Weight Rating | - |
| Overall Height | - |
| Overall Length | - |
| Overall Width | - |
| Wheelbase Length | - |
| Standard Seating | - |
Engine & Performance
| Engine | - |
| Engine Size | - |
| Engine Cylinders | - |
| Transmission | - |
| Transmission Type | - |
| Transmission Speeds | - |
| Drivetrain | - |
Additional Features
| Anti-Brake System | - |
| Steering Type | - |
Pricing
| Manufacturer Suggested Retail Price (MSRP) | - |
| Invoice Price | - |
| Delivery Charges | - |
Vehicle History Report
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What Problems Does the 1998 Mercedes-Benz S-Class Have?
The 1998 Mercedes-Benz S-Class (W140 generation) is renowned for its robust build, but it's not without its common, often costly, long-term reliability concerns. One of the most infamous issues, particularly affecting earlier W140s but still a concern for the 1998 models if not previously addressed, is the degradation of the engine wiring harness. The eco-friendly insulation used in production proved prone to crumbling, leading to misfires, stalling, and various electrical faults. This is a critical "watch out" and often requires replacement.
Another frequently reported problem involves the HVAC system, specifically the evaporator. Located deep within the dashboard, its replacement is an extremely labor-intensive and expensive job, often costing thousands of dollars. Owners frequently experience weak or non-existent air conditioning due to this component failing.
Hydraulic components, particularly the self-leveling suspension system (ADS) found on V8 and V12 models, can be a significant source of trouble. Leaks in the hydraulic lines, failing accumulators, and issues with the pump can lead to sagging suspension and a rough ride. Power steering pumps and lines can also develop leaks.
Various electrical gremlins are common across the W140 range. These can manifest as malfunctioning power seats, window regulators, soft-close door mechanisms, instrument cluster pixel issues, and problems with the vacuum system that controls central locking and headrest deployment. The ignition tumbler can also seize.
Transmission issues, particularly with the 5-speed automatic introduced later in the W140's life (especially the 722.6), can include conductor plate failures or rough shifting, though it's generally robust if maintained. Rust can be a concern, especially around wheel arches, door bottoms, and jacking points, particularly in areas exposed to road salt.
While specific recalls for the 1998 model year might be less frequent now, earlier W140s had recalls for issues like cruise control systems and potential engine compartment fires related to wiring or fuel leaks. Prospective buyers should always check VIN-specific recall history. Due to the complexity and sheer number of components, routine maintenance is crucial, and deferred maintenance can quickly lead to a cascade of expensive repairs.
Another frequently reported problem involves the HVAC system, specifically the evaporator. Located deep within the dashboard, its replacement is an extremely labor-intensive and expensive job, often costing thousands of dollars. Owners frequently experience weak or non-existent air conditioning due to this component failing.
Hydraulic components, particularly the self-leveling suspension system (ADS) found on V8 and V12 models, can be a significant source of trouble. Leaks in the hydraulic lines, failing accumulators, and issues with the pump can lead to sagging suspension and a rough ride. Power steering pumps and lines can also develop leaks.
Various electrical gremlins are common across the W140 range. These can manifest as malfunctioning power seats, window regulators, soft-close door mechanisms, instrument cluster pixel issues, and problems with the vacuum system that controls central locking and headrest deployment. The ignition tumbler can also seize.
Transmission issues, particularly with the 5-speed automatic introduced later in the W140's life (especially the 722.6), can include conductor plate failures or rough shifting, though it's generally robust if maintained. Rust can be a concern, especially around wheel arches, door bottoms, and jacking points, particularly in areas exposed to road salt.
While specific recalls for the 1998 model year might be less frequent now, earlier W140s had recalls for issues like cruise control systems and potential engine compartment fires related to wiring or fuel leaks. Prospective buyers should always check VIN-specific recall history. Due to the complexity and sheer number of components, routine maintenance is crucial, and deferred maintenance can quickly lead to a cascade of expensive repairs.
How long will the 1998 Mercedes-Benz S-Class last?
With diligent maintenance, a 1998 Mercedes-Benz S-Class can easily achieve 200,000 to 300,000 miles, and many examples exist with even higher mileage. These vehicles were built for the Autobahn and designed to last. Their long-term durability is a testament to their "over-engineered" nature, with robust engines and transmissions capable of incredible longevity.
However, this durability comes with the caveat of needing consistent, often expensive, maintenance. Over time, weaknesses like the biodegradable wiring harnesses, HVAC evaporator, and complex hydraulic suspension components will almost certainly require attention. Electrical subsystems (sensors, window regulators, seat modules, soft-close doors) are also prone to age-related failures. Rust can become an issue in neglected areas, especially in salt-prone climates. While the core mechanicals are strong, the ancillary systems and luxury features demand significant investment to keep fully functional over decades of service.
However, this durability comes with the caveat of needing consistent, often expensive, maintenance. Over time, weaknesses like the biodegradable wiring harnesses, HVAC evaporator, and complex hydraulic suspension components will almost certainly require attention. Electrical subsystems (sensors, window regulators, seat modules, soft-close doors) are also prone to age-related failures. Rust can become an issue in neglected areas, especially in salt-prone climates. While the core mechanicals are strong, the ancillary systems and luxury features demand significant investment to keep fully functional over decades of service.
What Technology & Safety Features are Included?
The 1998 Mercedes-Benz S-Class was a technological tour-de-force for its era, offering an impressive array of built-in tech, entertainment, and safety features. Standard equipment included sophisticated automatic climate control, a premium Bose sound system (often with a trunk-mounted CD changer), power-adjustable seats with memory functions for both driver and passenger, and power windows, mirrors, and door locks. The dual-pane insulated glass significantly reduced road noise, contributing to its vault-like quietness.
Entertainment systems were comprehensive, usually featuring a Becker head unit, AM/FM radio, and cassette player, augmented by the optional multi-CD changer. While not having modern touchscreen interfaces, the controls were intuitively laid out for the time.
Driver-assistance features were quite advanced for the late 1990s. The Electronic Stability Program (ESP), a groundbreaking technology that helped prevent skids, was standard on the S600 and often optional on other V8 models for 1998. Adaptive Damping System (ADS), which automatically adjusted shock absorber stiffness, was standard on V8 and V12 models, enhancing ride comfort and handling. Other features included cruise control, self-leveling rear suspension (on most V8/V12, optional on I6), and front and rear parking sensors (Parktronic) which were an advanced optional extra.
Safety was a paramount concern. The 1998 S-Class came standard with dual front airbags, side airbags for front occupants (a relatively new feature then), and antilock brakes (ABS). Traction control (ASR) was also standard, working in conjunction with ABS to maintain grip. The robust construction and substantial size of the W140 provided excellent passive safety. Crash-test ratings from agencies like NHTSA or IIHS are not readily available in the modern format for a vehicle of this age, as standardized testing and public reporting were different in the late 1990s. However, its reputation for solidity and advanced safety features for the period suggests a very high level of occupant protection.
Entertainment systems were comprehensive, usually featuring a Becker head unit, AM/FM radio, and cassette player, augmented by the optional multi-CD changer. While not having modern touchscreen interfaces, the controls were intuitively laid out for the time.
Driver-assistance features were quite advanced for the late 1990s. The Electronic Stability Program (ESP), a groundbreaking technology that helped prevent skids, was standard on the S600 and often optional on other V8 models for 1998. Adaptive Damping System (ADS), which automatically adjusted shock absorber stiffness, was standard on V8 and V12 models, enhancing ride comfort and handling. Other features included cruise control, self-leveling rear suspension (on most V8/V12, optional on I6), and front and rear parking sensors (Parktronic) which were an advanced optional extra.
Safety was a paramount concern. The 1998 S-Class came standard with dual front airbags, side airbags for front occupants (a relatively new feature then), and antilock brakes (ABS). Traction control (ASR) was also standard, working in conjunction with ABS to maintain grip. The robust construction and substantial size of the W140 provided excellent passive safety. Crash-test ratings from agencies like NHTSA or IIHS are not readily available in the modern format for a vehicle of this age, as standardized testing and public reporting were different in the late 1990s. However, its reputation for solidity and advanced safety features for the period suggests a very high level of occupant protection.
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 S-Class Prices and Market Value
When new in 1998, the Mercedes-Benz S-Class had a substantial price tag, ranging from approximately $65,000 for an S320 to well over $130,000 for a fully-optioned S600 V12. This reflected its position as a top-tier luxury vehicle.
Today, its depreciation has been immense, which is typical for high-end luxury cars with complex systems. Current used market prices for a 1998 S-Class vary widely, from as low as $3,000 for examples needing significant work to $10,000-$20,000 for well-maintained, lower-mileage specimens, particularly V8 or V12 models. Pristine, collector-grade S600s might fetch slightly more. Factors severely affecting resale value include deferred maintenance, extensive electrical issues, rust, high mileage, and any signs of neglect. Conversely, a comprehensive service history, excellent cosmetic condition, and fully functional systems (especially HVAC and electronics) significantly boost its appeal and value, making it an attractive "future classic" for enthusiasts.
Today, its depreciation has been immense, which is typical for high-end luxury cars with complex systems. Current used market prices for a 1998 S-Class vary widely, from as low as $3,000 for examples needing significant work to $10,000-$20,000 for well-maintained, lower-mileage specimens, particularly V8 or V12 models. Pristine, collector-grade S600s might fetch slightly more. Factors severely affecting resale value include deferred maintenance, extensive electrical issues, rust, high mileage, and any signs of neglect. Conversely, a comprehensive service history, excellent cosmetic condition, and fully functional systems (especially HVAC and electronics) significantly boost its appeal and value, making it an attractive "future classic" for enthusiasts.
1998 Mercedes-Benz S-Class Cost of Ownership
Owning a 1998 Mercedes-Benz S-Class is unequivocally costly. Insurance can be moderate to high, depending on coverage and driver history, but it's the fuel, maintenance, and repair costs that truly escalate. With a powerful engine lineup, fuel economy is poor (13-20 MPG), leading to high fuel bills, especially for premium unleaded.
Maintenance is crucial and expensive. Parts are premium-priced, and specialized labor is often required due to the vehicle's complexity. Expect to pay significantly for routine services and even more for repairs of common issues like wiring harnesses, HVAC evaporators, or hydraulic suspension. This is not an economical vehicle; rather, it demands a substantial ongoing financial commitment from its owner, resembling the cost of a much newer luxury car to maintain.
Maintenance is crucial and expensive. Parts are premium-priced, and specialized labor is often required due to the vehicle's complexity. Expect to pay significantly for routine services and even more for repairs of common issues like wiring harnesses, HVAC evaporators, or hydraulic suspension. This is not an economical vehicle; rather, it demands a substantial ongoing financial commitment from its owner, resembling the cost of a much newer luxury car to maintain.
1998 Mercedes-Benz S-Class Fuel Efficiency
Fuel Type
Gasoline
Fuel Capacity
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City Mileage
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Highway Mileage
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1998 Mercedes-Benz S-Class Safety Rating
NHTSA
1998 Mercedes-Benz S-Class Insurance
Insurance for a 1998 Mercedes-Benz S-Class is moderately priced, reflecting its status as a Sedan with strong safety ratings and
reasonable repair costs.
reasonable repair costs.
How Does the 1998 Mercedes-Benz S-Class Compare to Other Sedan?
The 1998 Mercedes-Benz S-Class (W140) competed in a fiercely contested segment, primarily against the BMW 7-Series (E38), Lexus LS 400 (XF20), and Audi A8 (D2).
Performance: The S-Class generally offered comparable or superior straight-line performance, especially in S500 and S600 guises, with the V12 being a powerhouse. The BMW E38 740i offered a sportier, more agile driving experience, while the Lexus LS 400 was known for its buttery-smooth, refined power delivery. The Audi A8, with its Quattro AWD, offered superior all-weather traction.
Features: The S-Class was arguably the most feature-rich and technologically advanced for its time, boasting innovations like double-pane glass, soft-close doors, and a particularly opulent interior. The BMW 7-Series was also well-appointed, focusing on driver-centric controls. The Lexus LS 400 prioritized flawless reliability and quietness over outright innovation, while the Audi A8 pioneered aluminum space frame technology.
Reliability: This is where the S-Class faces its biggest challenge. While mechanically robust, its sheer complexity and "over-engineering" led to numerous, often expensive, electrical and accessory failures (wiring harnesses, HVAC, hydraulic systems). The Lexus LS 400 stands out as the reliability champion of this era, legendary for its trouble-free ownership. The BMW 7-Series was generally more reliable than the S-Class but still had its share of cooling system and electronic issues. The Audi A8, with its sophisticated AWD and air suspension (on some models), could also be costly to maintain.
Price (used): All these vehicles have depreciated massively. The S-Class, due to its high maintenance reputation, often trades for similar or slightly less than comparable BMW E38s, and sometimes less than pristine LS 400s which hold their value better due to reliability. The Audi A8 can also be found at similar price points.
Alternatives:
Performance: The S-Class generally offered comparable or superior straight-line performance, especially in S500 and S600 guises, with the V12 being a powerhouse. The BMW E38 740i offered a sportier, more agile driving experience, while the Lexus LS 400 was known for its buttery-smooth, refined power delivery. The Audi A8, with its Quattro AWD, offered superior all-weather traction.
Features: The S-Class was arguably the most feature-rich and technologically advanced for its time, boasting innovations like double-pane glass, soft-close doors, and a particularly opulent interior. The BMW 7-Series was also well-appointed, focusing on driver-centric controls. The Lexus LS 400 prioritized flawless reliability and quietness over outright innovation, while the Audi A8 pioneered aluminum space frame technology.
Reliability: This is where the S-Class faces its biggest challenge. While mechanically robust, its sheer complexity and "over-engineering" led to numerous, often expensive, electrical and accessory failures (wiring harnesses, HVAC, hydraulic systems). The Lexus LS 400 stands out as the reliability champion of this era, legendary for its trouble-free ownership. The BMW 7-Series was generally more reliable than the S-Class but still had its share of cooling system and electronic issues. The Audi A8, with its sophisticated AWD and air suspension (on some models), could also be costly to maintain.
Price (used): All these vehicles have depreciated massively. The S-Class, due to its high maintenance reputation, often trades for similar or slightly less than comparable BMW E38s, and sometimes less than pristine LS 400s which hold their value better due to reliability. The Audi A8 can also be found at similar price points.
Alternatives:
- For Reliability-Focused Buyers: The 1998 Lexus LS 400 (XF20) is arguably a "better" alternative for those prioritizing bulletproof reliability and lower running costs, though it lacks the sheer presence and advanced tech of the S-Class.
- For Driving Dynamics: The 1998 BMW 740i (E38) offers a more engaging driving experience while still providing significant luxury.
- For Ultimate Luxury/Prestige (with maintenance budget): No direct "better" alternative for the sheer W140 experience. It's unique.
Final Verdict: Is the 1998 Mercedes-Benz S-Class a Good Sedan?
The 1998 Mercedes-Benz S-Class (W140) is ideal for the automotive enthusiast or collector who appreciates classic luxury, exceptional build quality, and a commanding road presence, and critically, possesses a significant budget for maintenance and repairs. It's also suitable for someone seeking immense luxury for a modest initial purchase price, provided they understand the substantial ongoing ownership costs.
It is absolutely worth buying as a used vehicle, but only under specific conditions: acquire a well-documented example with a comprehensive service history, ideally from an owner who has already addressed major common issues like the wiring harness and HVAC evaporator. Look for the V8 (S420/S500) for a good balance of power and (relative) simplicity over the V12 (S600), which adds another layer of complexity. Avoid neglected cars, as their restoration will far exceed their value. For those who can afford its upkeep, it offers an unparalleled classic luxury experience.
It is absolutely worth buying as a used vehicle, but only under specific conditions: acquire a well-documented example with a comprehensive service history, ideally from an owner who has already addressed major common issues like the wiring harness and HVAC evaporator. Look for the V8 (S420/S500) for a good balance of power and (relative) simplicity over the V12 (S600), which adds another layer of complexity. Avoid neglected cars, as their restoration will far exceed their value. For those who can afford its upkeep, it offers an unparalleled classic luxury experience.
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.