2017 — 2018
3.0L V6 Bi-Turbo (M276 DE30 AL) - E400 4MATIC
Petrol
Cold Start Assessment | Description: During your first start of the day, listen for a momentary rattle from the engine bay. It is helpful to be aware that the timing chain tensioners in the M276 engine can occasionally show signs of wear, which may require professional inspection.
Air Suspension Check | Description: While driving on uneven surfaces, listen for any unusual noises from the corners of the vehicle. If the car is equipped with Air Body Control, it is worth noting that the air struts can eventually experience leaks as they age.
Gearbox Smoothness Test | Description: During low-speed stop-start traffic, pay attention to the shift quality of the 9G-TRONIC transmission. It is common for these units to benefit from a software update or a fluid flush to maintain their intended buttery-smooth operation.
Infotainment Verification | Description: Check this by navigating through all COMAND system menus and ensuring the touchpad remains responsive. Electronic gremlins can occasionally arise in high-tech cockpits, so ensuring all features are functional is a wise move.
Recommended interval for transmission fluid flush to ensure the 9G-TRONIC remains in peak condition.
Consider having the spark plugs and air filters inspected, as these are critical for maintaining the efficiency of the Bi-Turbo V6.
A common time to have the cooling system hoses and auxiliary belt reviewed for signs of fatigue.
Verify the service history specifically looks for premium European-spec engine oil changes at 10,000km intervals.
Inspect the brake rotors and pads, as the performance nature of the E400 means these are wear items that should be monitored.
Ensure the panoramic sunroof mechanism has been lubricated during previous services to prevent binding.
Test all seat adjustments and lumbar support functions, as the complex motors can occasionally require a reset.
Check the tire tread wear patterns; uneven wear can sometimes indicate that a wheel alignment is overdue.
Estimated repair costs if issues arise
If the vehicle is equipped with air suspension, it is worth keeping in mind that these components may eventually lose their seal over time. Depending on your driving conditions, you might eventually need to budget for a replacement of one or more corners.
If you notice a rattle at start-up, it is common to consider a preventative replacement of the tensioners. If this component needs attention in the future, the estimated cost in NZ covers the specialized labour required for this specific V6 layout.
As the engine mounts are hydraulic, they can soften over the years, leading to increased cabin vibration. It is common for owners to refresh these as part of long-term ownership maintenance.
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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