2014 — 2017
3.0L V6 Bi-Turbo (CLS 400) - RWD
Petrol
When cold starting the engine, listen closely for a metallic rattle from the top of the motor for the first few seconds, as the timing chain tensioners can occasionally show wear in higher-mileage examples.
While driving at low speeds, navigate over some uneven road surfaces to ensure the Airmatic air suspension operates silently and maintains a level ride height without any 'sinking' while parked.
Check the infotainment screen functions by cycling through every menu option, as the COMAND system controllers can sometimes become unresponsive or suffer from internal wiring fatigue.
During the test drive, shift the transmission manually through all gears to ensure the 7G-TRONIC or 9G-TRONIC gearbox transitions smoothly without any hesitation or harsh gear changes.
Common point for the initial inspection of suspension bushings and potential air spring bag fatigue.
A major service interval where it is wise to ensure transmission fluid and filter service has been completed.
Consider having the turbocharger cooling lines and vacuum solenoids inspected as part of standard proactive maintenance.
Ensure there is a consistent history of synthetic oil changes, ideally every 10,000 to 15,000 km.
Verify the coolant has been flushed, as this helps protect the intricate Bi-Turbo cooling system components.
Keep a close eye on the front control arm bushings; they are a standard wear item on NZ roads.
Periodically check for any dampness under the floor mats, as sunroof drain tubes can occasionally require cleaning.
Always use high-octane fuel to ensure the engine management system operates within its optimal parameters.
Estimated repair costs if issues arise
If the vehicle sits unevenly after sitting for a few days, it is common to consider that an air strut may eventually require replacement. Future Budget Planning: It is wise to set aside funds for a strut replacement should the system lose pressure.
To keep the shifts buttery smooth as the kilometres climb, a full transmission fluid and filter flush is recommended. Future Budget Planning: Depending on the car's history, you might eventually need to budget for this service to maintain longevity.
These rubber mounts can soften over time, which may lead to increased vibration at idle. Future Budget Planning: If you notice a slight buzzing in the cabin, it is common to consider replacing these during a major service.
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