2017 — 2021
4.0L V8 (M178) - GT C
Petrol
Check this by accelerating firmly in Sport+ mode | Description: Listen for any hesitation in the 7-speed dual-clutch transmission; at this age, it is common to consider whether a transmission software update or fluid flush could improve shift smoothness.
While driving at low speeds over uneven surfaces | Description: Listen for any light clunking from the front suspension, as the complex AMG Ride Control bushings can show signs of wear, making them a sensible point to inspect during a pre-purchase check.
Check this by inspecting the front wheels after your drive | Description: Observe for excessive brake dust or signs of vibration under heavy braking, as the high-performance rotors on the GT C are significant components that may show surface heat checking as they age.
Check this by cycling through the infotainment and drive modes while stationary | Description: Verify that all electronic drive mode selectors function without delay; occasionally, the command module interface can become sluggish, which is a common quirk to keep an eye on.
Usually marks the point for a major service including spark plugs and transmission fluid exchange.
A common window to assess the condition of cooling system components like the water pump and auxiliary belts.
Typically when suspension dampers and cooling hoses should be reviewed for signs of age-related degradation.
Ensure the full logbook service history is present and verify the engine oil meets the specific AMG viscosity requirements.
Check for any signs of seepage around the turbocharger oil lines, as this is a known area for minor weeping in the M178 engine.
Review the history of the cooling system, as these engines run quite warm and benefit from regular coolant flushes.
Inspect the tyres for even wear patterns, as the aggressive factory alignment on the GT C is designed for handling but can be hard on inner edges.
Verify the presence and condition of the trickle charger, as the complex electronics in these vehicles prefer a healthy battery to avoid intermittent warnings.
Estimated repair costs if issues arise
If the vehicle is equipped with the performance braking package, you might eventually need to budget for rotors and pads as they wear down through spirited use.
Should the adaptive damping system require attention in the future, these units are highly sophisticated and are best replaced as a set to maintain the car's balanced handling dynamics.
In cars of this age, it is common to consider that the secondary plumbing around the turbos may eventually need fresh seals, which involves a fair amount of labour time.
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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