2006 — 2012
3.5L V6 (M272) - SL350 High-Efficiency Direct Injection
Petrol
Check the ABC suspension performance by cycling the suspension height button while stationary. | Note: On cars of this age, it is common to consider the health of the hydraulic struts and pump, as they are complex and require specific servicing.
Observe the dashboard display during the initial start-up for any 'Consumer Electronics' or 'Battery' error messages. | Note: These models rely heavily on a complex dual-battery system; occasional warnings might suggest the convenience battery or the alternator regulator requires attention.
Operate the retractable hardtop through a full cycle in a quiet location while listening for abnormal straining. | Note: It is wise to inspect the hydraulic seals and roof hinges for any signs of fluid weeping, as smooth operation is key to longevity.
Listen carefully for a rattle or light ticking during a cold start, specifically focusing on the engine front. | Note: While many perform reliably, it is worth researching the history of the M272 engine regarding the balance shaft gear to ensure preventative maintenance has been considered.
Usually the time to inspect suspension bushes and ball joints for wear from NZ road conditions.
Consider a full transmission fluid and filter flush to maintain smooth shifting.
A common point to review the condition of the engine mounts and hydraulic fluid reservoir levels.
Check that the panoramic roof or soft-top seal condition is maintained with appropriate rubber conditioner.
Regularly clean the drainage channels around the windscreen and roof to prevent moisture ingress.
Verify the service history specifically looks for genuine Mercedes-Benz approved fluids.
Ensure the COMAND infotainment system software is updated for better Bluetooth connectivity.
Confirm the auxiliary battery located in the boot has been tested for its ability to hold a charge.
Estimated repair costs if issues arise
If this component needs attention in the future, the estimated cost in NZ is higher due to the specialised nature of the hydraulic struts and the potential need for a pump overhaul.
Depending on the car's history, you might eventually need to budget for timing component wear, which involves a significant amount of labour to access the front of the engine.
If a seal fails, it can cause a leak inside the cabin or boot area. Replacing or refurbishing these cylinders is a specialised job best handled by an independent Mercedes expert.
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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