2008 — 2011
3.5L (M272) - CLC 350 V6
Petrol
During your drive, gently accelerate and decelerate to check if the 7G-Tronic transmission shifts smoothly without jerking or hesitation, as solenoids can sometimes wear over time.
With the engine running, listen closely for a rattling noise from the front of the engine, as the balance shaft gear in early M272 engines may show signs of wear.
Operate the panoramic sunroof through its full cycle to ensure it tracks smoothly without clicking or stopping, as the mechanism can get stiff if not regularly lubricated.
Perform a 'lock-to-lock' steering check while idling to listen for any groaning sounds, which might indicate the power steering pump or fluid quality needs future attention.
Cooling system refresh, including the thermostat and expansion tank.
Spark plug replacement and inspection of engine mounts for signs of compression.
Transmission fluid and filter service to ensure the longevity of the 7G-Tronic unit.
Check the service logbook for evidence of regular oil changes using high-quality synthetic lubricants.
Verify that the battery is healthy, as these electronics-heavy models can behave erratically with low voltage.
Inspect the condition of the rubber door and window seals, which can dry out in the NZ sun.
Confirm that the COMAND infotainment system and steering wheel buttons are fully responsive.
Look underneath for any signs of oil sweating around the engine block or differential housing.
Estimated repair costs if issues arise
While not every CLC 350 is affected, it is wise to keep this on your radar. If this component needs attention in the future, the work involves a significant engine strip-down, so it is best to check the engine number history during your pre-purchase inspection.
Given our winding NZ roads, the control arm bushings may eventually need replacing to maintain that smooth Mercedes ride. You might eventually need to budget for a full suspension refresh if you notice any wandering or uneven tyre wear.
The 7G-Tronic is a sophisticated unit. If shifting becomes less refined, it is worth setting aside funds for a professional diagnosis and potential valve body service to prevent further wear.
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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