2016 — 2018
3.0L V6 Bi-Turbo (M276 DE30 AL) - E400 4MATIC
Petrol
While at a complete stop with the engine idling, listen for any metallic rattling sounds coming from the front of the engine, which could indicate early signs of timing chain tensioner wear.
During your test drive, pay close attention to the gear shifts, particularly between 1st and 3rd, to ensure the 9G-TRONIC transmission feels smooth rather than jerky or hesitant.
Check the Air Body Control (if equipped) by cycling through the suspension modes while stationary and confirming the vehicle levels out promptly without any warning lights on the dashboard.
While driving on an uneven road, listen for any knocking sounds from the suspension, as the complex multi-link setup on these models can occasionally show signs of wear in the control arm bushings as they age.
Recommended major transmission fluid and filter service to ensure the longevity of the 9G-TRONIC system.
Consider inspecting the engine mounts and transmission mounts, as these can soften and increase vibration over time.
Time to evaluate the cooling system components, including the water pump and thermostat, for any signs of weeping or fatigue.
Ensure the 9G-TRONIC transmission service history is documented, as crisp shifting depends heavily on clean fluid.
Verify that the M276 engine has had its oil changed at strict intervals, ideally every 10,000km, to keep those twin turbos happy.
Check the panoramic sunroof tracks for debris and ensure the seals are lubricated to prevent any potential rattles or sticking.
Inspect the brake rotors and pads; given the E400's weight and performance, these are consumables that should be checked for thickness regularly.
Confirm that all software updates for the COMAND infotainment system have been performed to ensure stable Bluetooth and navigation performance.
Estimated repair costs if issues arise
If the vehicle is equipped with Air Body Control, these struts can eventually require attention. Depending on the car's history, you might eventually need to budget for replacing the air bags or the compressor unit to maintain that signature smooth ride.
It is common for these mounts to compress over high mileage, leading to subtle vibrations at idle. If you notice a bit more 'thrum' in the cabin, you might need to plan for a refresh of the engine and transmission support mounts.
While the M276 is generally robust, it is a good practice to keep an eye on the tensioners as the vehicle reaches higher kilometres. If this component needs attention in the future, the estimated cost in NZ involves a significant amount of labour to access the front of the engine.
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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