2018 Mercedes-Benz S450 — Should You Buy One?
Typical asking price: $42,000–$58,000. There are 2 high-severity known issues you need to know before handing over a check.
Kestrel Take
The benchmark luxury sedan — the W222 S-Class is the standard by which all others are judged for comfort, quiet, and technology, and the S450's twin-turbo V6 is efficient for the class. Depreciation makes a used one attainable, but flagship complexity means flagship repair bills. A documented S450 with full history is a peerless, comfortable car; a cheap neglected one is ruinous. Only buy with complete records and a substantial repair fund.
What we checked
Checked against public records, 2026-09-25
We checked NHTSA for this exact year and model and it returned nothing. That is a fact about the database, not a clean bill of health — it usually means few of these were sold or few owners filed. What follows is our own write-up, unreconciled.
Known Issues for the 2018 Mercedes-Benz S450
Ranked by wallet impact. These are documented, recurring problems — not freak accidents. How we decide that.
The vast electronics and driver-assist systems can fault expensively; verify every system.
Repair cost (estimate): $500-$3,000+
Source: not yet checked against public records.
The Airmatic air suspension leaks and fails; verify it rides level and holds at all corners.
Repair cost (estimate): $1,000-$3,500
Source: not yet checked against public records.
Verify service and check for oil/coolant leaks and turbo health.
Repair cost (estimate): $400-$3,000
Source: not yet checked against public records.
S-Class service, brakes, and tires are very pricey; demand full history.
Repair cost: Not yet priced
Source: not yet checked against public records.
Walk-Away Red Flags
- ✗No service history (deal-breaker)
- ✗Airmatic faults / sagging
- ✗Electronics faults
- ✗Cheap price hiding deferred maintenance
Good Signs
- ✓Full documented MB service
- ✓Airmatic level and holding
- ✓All electronics working, no leaks
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Known issues on this page are based on documented owner reports, NHTSA complaints, class-action records, and manufacturer technical service bulletins. Individual vehicles vary. A pre-purchase inspection by a trusted mechanic is always worth doing.
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