2018 Mercedes-Benz S-Class Reliability ReportKeepScore 78/100 · top failure points · buy or avoid
Quick Facts · 2018 Mercedes-Benz S-Class
- Scores 5 points below the strongest nearby year — the 2020 Mercedes-Benz S-Class earns a 83.
- The system most likely to surface first: airmatic/abc suspension system (major severity).
- No active NHTSA safety recalls on record — a clean recall slate for the 2018 model year.
2018 Mercedes-Benz S-Class: Buy or Avoid?
The 2018 Mercedes-Benz S-Class offers unparalleled luxury and cutting-edge technology, but be prepared for the high cost of maintaining its complex systems. While the core mechanicals are generally robust, the advanced air suspension and intricate electronics can lead to costly repairs if neglected. This vehicle demands a dedicated budget for its upkeep to ensure a sublime ownership experience.
The 2018 Mercedes-Benz S-Class is a masterpiece of automotive engineering and luxury, but it's not for the faint of heart financially. If you have a substantial budget for maintenance and potential repairs, and you value a sublime driving experience, this car can be incredibly rewarding. However, without a dedicated…
Best Model Years
2018-2020 (W222 Facelift)
Years to Avoid
Earlier W222 models (2014-2017) had more initial software bugs, and W221 generations (2007-2013) can have even more extensive and costly suspension/electronic issues as they age.
Biggest Strengths
- Exceptional build quality and material integrity
- Robust powertrain options (V6, V8) when properly maintained
- Advanced safety and driver-assistance systems
2018 Mercedes-Benz S-Class — Known Trouble Spots
The systems that tend to fail first on the 2018 Mercedes-Benz S-Class, with the typical mileage window when each becomes a concern. Detailed repair-cost ranges and exact what-to-check inspection notes are in the full report.
Air struts, compressors, valve blocks, or hydraulic pumps (for ABC) can fail, leading to uneven ride height, harshness, or a complete loss of suspension function. These failures are due to aging components, seals, and pumps under constan…
Issues with the COMAND infotainment system (freezing, reboots), various sensors (parking, ABS, adaptive cruise control), and parasitic battery drain from complex control modules. These are often software-related or due to minor component…
Aging gaskets, particularly around valve covers, oil filter housings, and rear main seals, can develop leaks. While often minor initially, prolonged leaks can lead to other component failures or costly repairs due to labor-intensive access.
2018 Mercedes-Benz S-Class Mileage Danger Zones
The mileage windows when the 2018 Mercedes-Benz S-Class most commonly needs attention. Plan ahead, budget accordingly, and inspect before you cross each threshold.
Low Risk Zone
At this mileage, the vehicle is still relatively new. Focus on routine maintenance, tire rotations, and addressing any minor electrical glitches that might arise from software.
Maintenance Zone
This is a critical point for fluids and comprehensive checks. Transmission fluid service is often due, and suspension components should be thoroughly inspected for early signs of wear.
Elevated Risk Zone
Components with a finite lifespan, like certain engine gaskets and the AIRMATIC compressor, may start to show signs of wear. Budget for potential high-cost repairs.
High Risk Zone
Major components such as air struts, engine mounts, and certain electronic modules are nearing or exceeding their expected service life. Be prepared for significant potential expenses.
2018 Mercedes-Benz S-Class Ownership Cost Outlook
What it typically costs to keep the 2018 Mercedes-Benz S-Class on the road. Full 5-year cost-of-ownership projection and major-failure-risk forecast are in the report.
Annual Maintenance
$800-1,200
Moderate Repairs
$1,000-2,500 occasionally
How Long Does the 2018 Mercedes-Benz S-Class Last?
Focus on S-Class models with comprehensive service records and ideally below 80,000 miles to minimize immediate major repair risks. Be wary of vehicles with incomplete service histories, regardless of mileage.
What 2018 Mercedes-Benz S-Class Owners Actually Say
What Owners Love
- Unmatched ride quality and comfort, even on long journeys
- Sophisticated technology and intuitive COMAND infotainment system
- Powerful engine options with smooth, effortless acceleration
- Luxurious, high-quality interior materials and craftsmanship
Common Frustrations
- Extremely high maintenance and repair costs, even for minor issues
- Steep depreciation, making it a poor financial investment new
- Complex electronics can be frustrating with occasional glitches or unexplained warnings
- Fuel economy is respectable for its class, but still a significant running cost
Who Should Buy the 2018 Mercedes-Benz S-Class?
Best For
- Luxury enthusiasts seeking ultimate comfort and technology
- Executives who spend significant time commuting or on road trips
- Buyers with a substantial disposable income for maintenance and repairs
Not Ideal For
- Budget-conscious buyers seeking low running costs
- DIY mechanics looking for simple repairs
How the 2018 Mercedes-Benz S-Class Compares to Rivals
The S-Class is on par with its direct German rivals in terms of complexity and potential repair costs, often surpassing them in interior luxury and technological integration. However, it trails Japanese luxury offerings like Lexus LS in terms of sheer low-cost, worry-free long…
More Reliable Than
- Maserati Quattroporte (for overall reliability and dealer network)
- Jaguar XJ (for electronics and long-term mechanical robustness)
- Older generation luxury sedans known for early major component failures
Comparable To
- BMW 7-Series (G11/G12 generation)
- Audi A8 (D5 generation)
Safety Recalls on the 2018 Mercedes-Benz S-Class
No active NHTSA safety recalls on file for the 2018 Mercedes-Benz S-Class. Always verify with your VIN atnhtsa.gov.
What breaks on the 2018 Mercedes-Benz S-Class?
Full reliability breakdown — engine, transmission, rust, electrical. With repair costs and mileage danger zones.
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Mercedes-Benz S-Class — Year-by-Year Comparison
Compare KeepScores across nearby years of the Mercedes-Benz S-Class. Click any year for its full report.
Competing 2018s Worth a Look
Similar class, similar year range — ranked by KeepScore.
Relevant Products for Your 2018 Mercedes-Benz S-Class
Parts and accessories matched to your 2018 Mercedes-Benz S-Class
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Frequently Asked Questions
Just bought a 2018 Mercedes-Benz S-Class? Keep it that way.
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