2012 — 2020
5.5L V8 Twin-Turbo (M157) - SL 63 AMG
Petrol
Check this by accelerating firmly on a straight road. | Observation: Monitor for any signs of hesitation or erratic power delivery, as the M157 engine's twin-turbo setup relies heavily on precise boost management. Ensure the gear shifts are smooth, as the MCT transmission can occasionally feel firm when cold.
While parked with the engine running, carefully inspect the front engine valley. | Observation: Look for any signs of oil seepage or burning smells. The M157 engine has various gaskets and seals that, in cars of this age, may eventually require inspection to ensure everything remains tidy.
Operate the retractable hardtop through several full cycles while listening closely. | Observation: The complex roof mechanism is a masterpiece of engineering, but it involves many sensors and hydraulic lines. Smooth, consistent movement is a good sign of healthy system maintenance.
Test the ABC (Active Body Control) system by navigating a few corners. | Observation: Listen for any unusual hums from the pump or warning lights on the dash. The suspension should feel composed, and the ride height should remain consistent even after the car has been sitting for a period.
Usually marks the point where spark plug replacement and a major transmission service are recommended.
A common window to evaluate the health of the suspension accumulators and hydraulic fluid.
A stage where proactive attention to the engine's ancillaries and cooling system components is often considered standard practice for long-term ownership.
Prioritise regular engine oil changes using high-quality synthetic lubricants to keep those twin turbos happy.
Ensure the ABC suspension fluid is refreshed periodically to prevent contamination of the hydraulic system.
Keep an eye on the coolant expansion tank and surrounding hoses, as plastic components can become brittle over time.
Verify the service history for documented transmission fluid changes, as these are vital for the MCT gearbox longevity.
Regularly clean the drain scuppers near the windscreen and roof seals to ensure water clears away from the cabin and electrical modules.
Estimated repair costs if issues arise
If this component needs attention in the future, it involves replacing struts or hydraulic accumulators. Depending on the car's history, you might eventually need to budget for a comprehensive refresh of the system to maintain that signature smooth ride.
These engines run at high operating temperatures. If this component needs attention in the future, it may involve replacing cooling lines or turbo-related hardware. It is wise to have a fund set aside for preventative cooling system maintenance.
The MCT is a sophisticated unit. If this component needs attention in the future, the estimated cost in NZ includes professional servicing or potential solenoid replacement to ensure crisp shifting.
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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