Mercedes-Benz S-Class W221 350 (2987 cc)
Model overview
A refined but highly complex luxury sedan. Condition depends heavily on the specific engine, equipment, maintenance history and age.
Pros
- Exceptional comfort and refinement.
- Strong safety and long-distance ability.
Cons
- Complex electronics can be costly with age.
- Air suspension is expensive to maintain where fitted.
- Engine and equipment differences materially affect ownership costs.
Common problems & ownership concerns
Potential impact: Low · Medium · High. This describes possible consequences, not fault likelihood.
- Age-related electronic and convenience-system faultsMedium
- Air suspension or adaptive-chassis issues where fittedHigh
Maintenance
Use the VIN-specific service schedule and engine requirements; maintenance needs differ substantially between diesel, petrol, hybrid, AMG and V12 applications.
Engine overview · 3.0L 6-cyl DIESEL
A capable long-distance V6 diesel for the W221, with good touring performance when maintained properly. Ownership costs can rise with age, difficult engine access and emissions equipment that varies between CDI and BlueTEC applications.
Pros
- Well suited to motorway use
Cons
- Complex age-related repairs
- Short trips can burden emissions systems
- CDI and BlueTEC equipment differs
Common problems & ownership concerns
Potential impact: Low · Medium · High. This describes possible consequences, not fault likelihood.
- Oil cooler seal leaksMedium
- Intake swirl-flap and actuator faultsMedium
- EGR, DPF and diesel-emissions-system loadingHigh
- Injector seal and fuel-system leaksMedium
Maintenance
Follow the VIN-specific Mercedes-Benz schedule and approved oil specification; keep filters current and distinguish BlueTEC emissions servicing from routine engine maintenance.
These are general ownership concerns, not a diagnosis. Equipment and engine details vary by version and production date.
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