2016 — 2019
5.5L Bi-Turbo V8 (M157) - Mercedes-AMG GLS 63
Petrol
During low-speed maneuvers, listen carefully for any knocking or clicking noises from the air suspension struts, as these systems can experience wear over time.
Monitor the COMAND infotainment screen for any flickering or random reboots, as complex electrical gremlins can sometimes appear as these systems age.
While driving at varying speeds, check that the transmission shifts smoothly without hesitation, particularly when transitioning between lower gears, to ensure the gearbox is performing at its best.
Before turning the engine over, check for any visible weeping or residue around the turbocharger oil lines, as these can occasionally show signs of age in higher-mileage examples.
Consider a full transmission fluid and filter flush to keep the AMG Speedshift shifting precisely.
It is often a good time to have the air suspension compressor and relay inspected for consistent operation.
Evaluate the condition of the engine and transmission mounts, as these rubber components may soften after a decade of managing that massive V8 torque.
Keep a consistent log of engine oil changes, ensuring the specific high-performance oil grade required for the M157 engine is always used.
Regularly clean the drain tubes for the panoramic sunroof to prevent moisture ingress, which is vital for protecting the delicate interior electronics.
Ensure the cooling system is flushed on schedule, as maintaining clean coolant is the best way to support the longevity of the bi-turbo setup.
Inspect the brake rotors and pads regularly, as the heavy weight of the GLS 63 means these components work quite hard during everyday stop-start traffic.
Prioritize checking the condition of the cabin air filters to ensure the climate control system remains efficient and the air quality inside stays fresh.
Estimated repair costs if issues arise
If this component needs attention in the future, it involves replacing the air struts or the air compressor. Depending on the car's history, you might eventually need to budget for a refresh of these parts to maintain that signature Mercedes ride quality.
The GLS 63 uses high-performance braking hardware. When it comes time to replace these, it is a significant job, so it is wise to budget for this as part of your standard ownership plan.
In cars of this age, the secondary air system can occasionally trigger a check engine light due to carbon buildup. You might eventually need to budget for professional cleaning or component replacement.
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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