2005 — 2013
5.5L V8 (S500) - Powerful luxury flagship
Petrol
Check the Airmatic suspension by parking on flat ground and observing if the car sags overnight. | Description: It is common for older air suspension struts to develop slow leaks, which can put extra strain on the compressor.
Listen carefully for any rattling or ticking during a cold start. | Description: In high-mileage M273 V8 engines, it is worth monitoring the timing chain tensioners to ensure they are operating smoothly.
Operate the infotainment system via the COMAND controller for several minutes. | Description: Electronic gremlins can occasionally arise in luxury flagships of this era, so testing every menu and connection is a wise move.
Test the transmission by performing a gentle acceleration run. | Description: If you notice any hesitation or clunky shifts, it may be an indication that the transmission fluid and conductor plate might need a health check.
Usually the time to inspect suspension bushes and mounts for signs of wear from NZ road surfaces.
A common point to check cooling system components like the radiator and water pump to ensure consistent performance.
Generally a stage where peripheral engine accessories and transmission service records become vital for ongoing reliability.
Prioritise a full pre-purchase inspection from a specialist who knows the W221 platform well.
Verify the service history specifically for regular engine oil and filter changes.
Inspect the tyre tread for even wear to ensure the complex suspension geometry is aligned correctly.
Check that all electrical convenience features, like seat adjustments and soft-close doors, are functioning as expected.
Confirm the presence of a spare key, as these can be a specialised order through the dealership.
Estimated repair costs if issues arise
If the suspension needs attention in the future, these components are vital for that signature 'magic carpet' ride. Depending on the car's history, you might eventually need to budget for replacing the struts or the compressor.
These electronic units are known to occasionally fail as they age. If this component needs attention in the future, it is a common fix for specialists to perform to restore smooth gear changes.
Given the torque of the 5.5L V8, the mounts do a lot of heavy lifting. It is common to consider replacing these if you feel more vibration in the cabin than usual over time.
Noticed something inaccurate or missing?Suggest an edit→
Disclaimer: This report is generated with the assistance of AI analysis based on verified automotive data. While we strive for 100% accuracy, enthusiasts should always conduct physical inspections and consult service records. View Full Disclaimer