2015 — 2021
4.0L M177 V8 Twin-Turbo - Base performance version
Petrol
While driving at low speeds, gently apply the brakes to check for any 'pulsing' or vibration, as the large AMG compound brake rotors are a high-wear item that can be sensitive to heat cycling.
Check this by idling the car in neutral and listening for any ticking sounds from the engine bay, as the M177 can occasionally exhibit valve train noise that warrants a closer look at the service history.
While driving, pay attention to the transmission shifts in 'Comfort' mode; it should be smooth, as the MCT (Multi-Clutch Technology) gearbox is known for being slightly grabby at low speeds when cold, but should settle once warm.
Before moving off, check the infotainment screen and reverse camera clarity, as the electronics in these units are complex and it is worth ensuring all Mercedes COMAND functions operate without lag.
Consider a major service including transmission fluid and spark plug replacement to maintain engine performance.
A common point to inspect the cooling system components and water pump integrity.
Usually the time to evaluate the suspension bushings and potential engine mount wear.
Verify the full digital service history to ensure oil changes have been completed well within the recommended intervals.
Check the tire tread patterns, as the high torque of the M177 engine tends to wear the rear tires significantly faster than the front.
Inspect the coolant reservoir for any signs of staining or crust, which can be an early indicator of a cooling system pressure loss.
Ensure the panoramic sunroof mechanism operates quietly and smoothly without any binding, as the tracks require periodic cleaning.
Confirm the air-to-liquid intercooler levels are checked, as this is vital for maintaining the performance of those twin turbochargers.
Estimated repair costs if issues arise
Because these brakes offer incredible stopping power, they do wear down. It's wise to plan for this replacement eventually to maintain the car's peak performance.
Due to the immense torque of the 4.0L V8, the hydraulic engine mounts can eventually soften. You might notice more vibration at idle when this becomes necessary.
In cars of this age, it's common to consider the longevity of the auxiliary pumps that keep the turbos cool. It's a proactive measure to ensure your engine stays within optimal operating temperatures.
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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