2018 Mercedes-Benz S-Class Reliability ReportCommon Problems, Repair Costs & Expert Verdict
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Quick Facts · 2018 Mercedes-Benz S-Class
- No active NHTSA safety recalls on record — a clean recall slate for the 2018 model year.
- 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).
The 2018 Mercedes-Benz S-Class at a glance
- Is the 2018 Mercedes-Benz S-Class reliable?
- Autojunket rates the 2018 Mercedes-Benz S-Class 78/100 (grade C+), categorized as moderate risk. A majestic luxury sedan that rewards with comfort and performance, but demands a robust maintenance fund and vigilant ownership.
- Should I buy a used 2018 Mercedes-Benz S-Class?
- Autojunket recommends reading the full reliability report before buying a 2018 Mercedes-Benz S-Class. 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…
- Which Mercedes-Benz S-Class years are the most reliable?
- Best model years to buy: 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..
- What are the most common problems with the 2018 Mercedes-Benz S-Class?
- The top failure points on the 2018 Mercedes-Benz S-Class are AIRMATIC/ABC Suspension System (typically around 60,000-100,000 miles), Advanced Electrical/Electronics (typically around 40,000-80,000 miles), Engine Gaskets and Seals (typically around 80,000-120,000 miles). Autojunket's full report includes repair-cost ranges and inspection checklists for each.
- At what mileage do problems start on the 2018 Mercedes-Benz S-Class?
- The first major mileage danger zone for the 2018 Mercedes-Benz S-Class is around 30,000. 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.
Every answer is generated from real repair, recall, and ownership data — full breakdown in the report.
Read the full free reportShould You Buy the 2018 Mercedes-Benz S-Class?
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
Top Risk Areas
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)
NHTSA Recalls
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.
Autojunket OSC · OSC Transfer
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Mercedes-Benz S-Class by Year
Compare AutoScores across nearby years of the Mercedes-Benz S-Class. Click any year for its full report.
If You're Considering This, Also Look At
Similar class, similar year range — ranked by AutoScore.
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Where the 2018 Mercedes-Benz S-Class report beats Carfax + CR
Carfax tells you if it crashed. Consumer Reports rates the whole nameplate. Autojunket tells you what will actually break on this specific year — and how to negotiate it.
Year-specific reliability score
Common problems + repair costs
Mileage danger zone map
AI negotiation script + walk-away price
Single report price
Frequently Asked Questions
Related Comparisons
Sell your 2018 Mercedes-Benz S-Class for what it's actually worth.
Log every service on your Mercedes-Benz S-Class. When it's time to sell, hand the buyer a signed PDF — every receipt, mileage-verified, close the deal at your price.
- OSC Transfer PDF — every receipt
- Snap-a-receipt AI log
- Fuel & mileage tracker
- Shareable buyer view link
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