2010 — 2013
5.5L V8 Bi-Turbo (M157)
Petrol
Check the transmission responsiveness during low-speed crawling. | Note: While driving in stop-start traffic, observe if the MCT gearbox shifts smoothly; occasionally, the clutch pack can show signs of wear in higher-mileage examples.
Monitor the Airmatic suspension performance over uneven road surfaces. | Note: Listen closely for any excessive compressor noise or a vehicle that appears to 'sag' after being parked, as air strut seals can naturally age over time.
Verify the cooling system temperature under load. | Note: Watch the temperature gauge during a spirited climb; it is common for the intercooler pump to eventually weaken, which can impact consistent performance.
Inspect the COMAND infotainment system and electronics. | Note: Test all cabin features, including seat ventilation and adjustability, as the complex wiring and control modules in the W221 can sometimes develop minor gremlins with age.
Usually the time to evaluate the health of the suspension bushings and engine mounts.
Consider a full transmission service and inspection of the secondary air injection system.
A common point to check the state of the timing chain tensioners and potential wear on the turbocharger gaskets.
Prioritise regular engine oil changes every 7,500km to protect the high-performance M157 twin-turbo internals.
Ensure the transmission fluid and filter have been changed according to schedule, as this is vital for the longevity of the MCT gearbox.
Keep an eye on the coolant levels and inspect for any weeping from the water pump or plastic cooling components.
Regularly clean the drain holes around the windscreen and sunroof to prevent moisture from reaching the sensitive cabin electronics.
Stick to high-quality tires and brake components, as the weight and power of the S63 make these the most crucial safety items.
Estimated repair costs if issues arise
If the ride height begins to vary or the pump cycles constantly, you might eventually need to budget for new air struts or a compressor unit to restore that signature smooth ride.
Given the performance capabilities of the S63, these heavy-duty braking components are subject to wear. It is wise to set aside funds for when your mechanic suggests fresh pads and rotors.
As part of long-term ownership, these lines can eventually develop minor weeps due to the intense heat cycles of the V8 bi-turbo setup; this is a common preventative maintenance task.
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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