2012 — 2018
6.0L V12 Bi-Turbo (M279) - G65 AMG
Petrol
Gently accelerate at lower speeds and feel for any hesitation; the M279 V12 engine is complex, and smooth delivery is a sign that the ignition system—specifically the transformer coils—is operating as expected.
Operate every single interior electronic function, including the seat massagers and entertainment screens, as the intricate wiring harnesses in the W463 can occasionally show signs of age in older examples.
Engage the locking differentials while on a loose surface at slow speed to confirm the mechanical linkages respond immediately, as disuse can sometimes lead to stiff operation in these systems.
Listen for any unusual whistling or high-pitched chirps during heavy acceleration, which could suggest that the extensive turbocharger cooling plumbing is due for an inspection.
Usually the time to evaluate the condition of the rubber bushings in the heavy-duty suspension setup.
A common point to review the condition of the cooling system components and turbocharger vacuum lines.
The typical interval for a deep dive into the ignition system health, as the dual-spark plug setup is quite involved.
Check the condition of the brake discs and pads frequently, as the G65 is a substantial vehicle that relies heavily on its braking system.
Prioritise regular engine oil changes using high-quality synthetic lubricants to keep those twin turbochargers happy.
Ensure the complex electrical system is kept at optimal charge levels, as these models are sensitive to battery voltage drops.
Keep a close eye on the coolant expansion tank and surrounding hoses for any signs of weeping or brittle material.
Regularly treat the door seals and roof gutter trim with appropriate conditioners to preserve the exterior finishes against the NZ UV rays.
Estimated repair costs if issues arise
In cars of this age, it is common to consider that the M279 ignition system is quite intricate. If you eventually notice misfires, you might need to budget for professional diagnosis and the replacement of the large coil modules.
Depending on the vehicle's usage history, the sophisticated suspension components may eventually require refurbishment. Planning for this ensures the ride quality remains as the engineers intended.
Given the heat generated by the V12 bi-turbo setup, it is wise to set aside funds for the eventual replacement of coolant hoses and auxiliary pumps to prevent overheating issues down the road.
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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