2018 — 2026
4.0L (M177) Biturbo V8 - Offroad Performance
Petrol
Listen carefully for any ticking or metallic rattle during a cold start, as the M177 engine's variable valve timing actuators occasionally show signs of wear in higher-mileage examples.
Check this by shifting between Park, Reverse, and Drive while stationary; ensure there is no significant 'clunk' or hesitation, as the 9G-TRONIC transmission requires smooth, crisp engagement.
While driving on an uneven surface, pay attention to the adaptive suspension settings; ensure the damping character changes noticeably between Comfort and Sport modes to confirm the electronic dampers are fully operational.
Examine the heavy front doors and hinges; open and close them several times to check for any sagging or resistance, as the weight of the G63 doors can place significant stress on the hinge mechanisms over time.
Usually marks the point for a major service including spark plugs and transmission fluid flush.
Often when suspension components, such as control arm bushings, may begin to show natural wear.
A key interval to review the status of engine ancillaries like the water pump and cooling system hoses.
Ensure you keep to a strict 10,000km or 12-month oil change interval to protect those high-performance turbochargers.
Check the tire tread depth regularly, as the G63's weight and power output can lead to quicker wear than a standard SUV.
Verify that the brake rotors and pads are inspected at every major service, as the AMG performance braking system is a significant component of the car's safety.
Keep the vehicle's software up-to-date at an authorised specialist to ensure the MBUX system and engine management remain optimized.
Regularly inspect the underside of the vehicle, especially if it has seen light off-road use, to ensure no debris has impacted the under-body plastics or cooling lines.
Estimated repair costs if issues arise
Given the performance capabilities of the G63, these components are subject to high thermal loads. Depending on the car's history, you might eventually need to budget for a complete set of AMG performance brakes.
The air struts provide a fantastic ride, but in cars of this age, it's common to consider that the rubber bellows or compressor may eventually require attention to maintain ride height.
To keep the M177 engine running optimally, hoses and expansion tanks may eventually need replacing as preventative care; if this component needs attention in the future, the estimated cost in NZ is reflective of OEM parts sourcing.
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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