2012 — 2016
5.5L V8 Bi-Turbo Petrol (M157) - GL63 AMG High Performance
Petrol
Test Drive Task: Cycle through the Airmatic suspension settings while idling and at speed. | Note: It is worth noting that if the vehicle drops or takes time to level, the air struts or compressor may eventually require attention.
Check this by: Opening the bonnet and listening closely for any rattling upon cold start. | Note: On the M157 engine, it is prudent to be aware that timing chain tensioners can sometimes show signs of age, which may be worth discussing with a specialist mechanic.
While driving: Gently apply the brakes at varying speeds to check for any vibration or pulling. | Note: Given the performance capabilities of the GL63, the braking system works hard, so ensuring the discs and pads have healthy life left is a sensible precaution.
Inspect this by: Checking the transmission shifts in 'Comfort' vs 'Sport+' modes. | Note: The MCT multi-clutch transmission is complex; feeling for smooth, consistent engagement helps gauge the overall health of the drivetrain.
Usually the time to evaluate the state of suspension bushings and control arms.
A common point where cooling system components like the water pump might warrant a proactive inspection.
Often the stage where spark plugs and coil packs are replaced to maintain the M157’s performance.
Prioritize regular engine oil changes every 10,000km using the correct high-performance synthetic specification.
Keep a close eye on the coolant expansion tank for any signs of discolouration or leaks.
Ensure the panoramic sunroof drains are clear to prevent water ingress in the footwells.
Verify that the battery health is optimal, as these electrical systems are highly sensitive to voltage drops.
Regularly inspect the tyre tread depth, as the weight and power of this vehicle can wear rubber down faster than standard SUVs.
Estimated repair costs if issues arise
If a corner starts sinking after sitting, you might eventually need to budget for strut replacement to restore ride comfort.
The M157 engine runs hot; if you notice a slight coolant smell or small drips, it's wise to plan for auxiliary pump maintenance.
Because this is a performance AMG model, these components are specialized. It is good practice to keep a fund ready for when the service indicator triggers.
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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