2016 — 2019
2.0L (M274) - SLC 300
Petrol
Listen for any rattle during a cold start. It is worth noting that the M274 engine's timing chain tensioner can occasionally show its age, so check that the engine idle settles smoothly within a minute.
Retract and extend the Vario-roof while parked on level ground. Watch the mechanism's fluidity; it is sensible to observe for any stuttering, which can sometimes indicate that the hydraulic pump fluid or seals might need attention later in the car's life.
Accelerate firmly onto a motorway to observe the 9G-TRONIC transmission. You are looking for seamless shifts; any hesitation or 'hunting' for gears might suggest that a transmission fluid and filter service is due, which is standard practice for maintaining these gearboxes.
Check the Comand infotainment system by cycling through all functions. It is good practice to ensure the rotary controller and display respond promptly, as electronic modules in luxury vehicles can occasionally become temperamental as they age.
Usually marks the interval for the first major transmission fluid service and potential spark plug replacement.
A common point to review the condition of suspension components like bushings and shock absorbers for optimal ride comfort.
Recommended timeframe to check the auxiliary drive belt and verify the cooling system health.
Ensure you have a complete service history, ideally performed by a specialist who understands the specific nuances of Mercedes-Benz engineering.
Check that the panoramic roof seals are clean and supple to prevent any cabin leaks during our famous NZ rainy days.
Verify that the battery is in good health, as these SLC models rely heavily on consistent voltage for the complex onboard electronics.
Keep a regular eye on the tyre tread across the inner edges, as the sporty alignment can lead to uneven wear if not monitored.
Stick to premium fuel (95 or 98 octane) to keep the direct-injection system running as cleanly and efficiently as the manufacturer intended.
Estimated repair costs if issues arise
If the roof mechanism starts to show signs of slow operation, you might eventually need to budget for a hydraulic system flush or a motor service to keep everything operating smoothly.
As these cars encounter New Zealand roads, it's common to consider that suspension bushings may show wear over time. Replacing these helps restore that signature 'Mercedes' ride quality.
While the transmission is robust, consistent maintenance is key. If this hasn't been done recently, it is a smart move to allocate funds for a professional fluid and filter change to ensure longevity.
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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