2012 — 2020
3.5L V6 (M276) - SL 350
Petrol
During your drive, gently apply the brakes at lower speeds to check for any shuddering, as these heavy convertibles can be prone to premature wear on front rotors and pads.
Before heading out, cycle the retractable roof mechanism multiple times while the engine is running to ensure the hydraulic pump and sensor array operate without stalling or hesitation.
Pay close attention to the Comand infotainment system; navigate through the menus while stationary to ensure there is no lag or screen flickering, as these units can occasionally develop electrical gremlins with age.
When checking the engine bay, look for any signs of oil weeping near the timing cover or camshaft adjusters, as the M276 engine can occasionally show seepage here as the vehicle ages.
Usually marks the first significant transmission fluid and filter service, which is vital for the 7G-Tronic gearbox longevity.
A common point to inspect the engine mounts and suspension bushings, which may begin to show signs of fatigue given New Zealand's varied road surfaces.
Consider having the spark plugs replaced and a comprehensive inspection of the vacuum lines and auxiliary cooling components.
Verify the service history specifically for the transmission fluid change; it makes a world of difference for shift quality.
Check the condition of the folding roof seals by looking for any signs of cracking or perished rubber to ensure your cabin stays dry.
Ensure the climate control functions correctly across both zones, as the blend door actuators are components that can occasionally require recalibration.
Have a look at the tyre wear patterns; since these cars have staggered setups, uneven wear can indicate a need for a professional wheel alignment.
Keep up with the annual brake fluid flush to maintain pedal feel and protect the ABS hydraulic unit from moisture buildup.
Estimated repair costs if issues arise
If the vehicle is equipped with the Airmatic system, it is worth remembering that air struts and the compressor are mechanical items that may eventually require replacement to maintain ride comfort.
Depending on the car's history, you might eventually need to budget for the maintenance of the roof hydraulic rams and pump, as seals can occasionally lose their elasticity over time.
In cars of this age, it is common to consider that engine and transmission mounts may eventually settle, which is a standard wear item that significantly improves cabin refinement when replaced.
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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