Mercedes-Benz S350 W221

2005-2011Last updated: May 2026 · How this report is builtMay 2026

2005-2011 · 3.5L M272 V6 (272 hp) 7G-Tronic automatic petrol

Mercedes-Benz S350 W221
Render © Car Checker

The W221 S-Class is widely regarded as one of the better S-Class generations for long-term ownership, offering genuine flagship luxury at a fraction of its original price. The S350 pairs the M272 3.5L V6 with the 7G-Tronic 7-speed automatic, producing 272 hp. Pre-facelift models (2005-2009) and facelift models (2009-2011) are available, with the facelift bringing visual refinements and improved electronics. An even later variant, the S350 BlueEFFICIENCY (2011-2013), switched to the newer M276 engine with 306 hp.· more· less

Exceptional comfort and refinement Heavy depreciation, strong value used
AIRMATIC suspension costly to repair M272 balance shaft risk (pre-2008)
Buy if: You want flagship luxury at a low purchase price and can verify the engine serial number is past the balance shaft sprocket cutoff, with documented AIRMATIC and service history.
Avoid if: You cannot absorb surprise bills above €2,000 or are looking at a pre-2008 car without verified balance shaft sprocket replacement.
Maintenance costs
€1,100 - €2,100/year
15,000 km/year
Fixed costs
€600-1,100
Risk buffer
€500-1,000
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Common Problems
Complex flagship, reliable engine when past the balance shaft risk
The W221 S350 can be dependable luxury transportation if the M272 engine is past the balance shaft sprocket serial number cutoff (post-2008 production) and the AIRMATIC suspension has been properly maintained. The 7G-Tronic gearbox is generally robust but the conductor plate is a known weak point. The biggest ongoing concern is the AIRMATIC system, which all W221s will eventually need work on given their age. Electrical complexity means that diagnosis requires specialist-level equipment. Overall costs are manageable compared to the V8 and V12 variants, but still firmly in luxury territory.
Buying a used Mercedes-Benz S-Class? Check its history.
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Pre-Purchase Inspection Checklist
General checks
Specific for this vehicle
Recalls and Technical Service Bulletins
Camshaft adjuster solenoid oil leak service campaign (2005-2011 M272/M273 engines) Verify completed
Fuel filter housing crack and potential fuel leak (certain 2006-2013 models) Verify completed
SAM module moisture ingress affecting lights and wipers (2006-2008 models) Verify completed
Takata airbag inflator (2005-2013 models) Verify completed
Contact a Mercedes-Benz dealer with the VIN to verify all recalls and service campaigns have been completed. The camshaft adjuster solenoid campaign (2012070002) is particularly important: if not completed, oil may be silently damaging the engine wiring harness.
Warranty Status
Factory warranty (2 years) Expired on all W221 S350 models
SBC brake system extended warranty 25 years / unlimited km on hydraulic pump
Rust perforation warranty (30 years) May still apply on later models, verify with dealer
All W221 S350 models are well outside their original 2-year factory warranty. The SBC brake system hydraulic pump has an extended warranty of 25 years with unlimited mileage. If the car still has the original SBC pump, this coverage may apply. Third-party extended warranties for cars this age are rarely cost-effective due to high claim likelihood.

↔ Also consider

Mercedes-Benz S500 W222
Mercedes-Benz S500 W222 2013-2017
Successor generation with more powerful M278 V8. Newer technology but higher running costs. AIRMATIC issues persist across both generations.
BMW 740i F01
BMW 740i F01 2008-2015
Direct competitor. LCI N55 inline-6 is robust but pre-LCI N54 has turbo and HPFP issues. Similar overall complexity and repair costs.
Audi A8 3.0 TDI D4
Audi A8 3.0 TDI D4 2010-2017
Better fuel economy with diesel V6. Aluminium body resists corrosion, but air suspension and timing chain are known weak points.
Mercedes-Benz S450 W222
Mercedes-Benz S450 W222 2017-2020
More modern S-Class with M276 V6 turbo. Fewer engine-specific issues than the M272 but newer so less long-term data available.
Porsche Panamera 970 3.6 V6
Porsche Panamera 970 3.6 V6 2009-2016
Sportier alternative with Porsche build quality. Simpler naturally aspirated V6 is more reliable, but Porsche parts and labor are expensive.

This report is for informational purposes only and does not constitute professional advice. Estimates may be inaccurate. Always have a qualified specialist inspect the vehicle before purchase. We accept no liability for decisions made based on this information.