2007 — 2014
3.5L V6 - C350
Petrol
When idling in Park, listen closely for a rhythmic ticking sound from the engine bay. | Note: On the M272 V6 engines, it is worth checking the condition of the balance shaft sprocket, as early models had a known issue with material wear.
While at a standstill, shift between Reverse and Drive several times. | Note: Be observant for any jerky movements or hesitation, as the 7G-Tronic transmission benefits from regular fluid changes to maintain smooth gear transitions.
Check the interior climate controls by setting the temperature to its lowest and highest extremes. | Note: It is common in cars of this age for the climate control stepper motors to become slightly sluggish or noisy behind the dashboard.
After your drive, safely check the engine oil level and inspect for any signs of seepage. | Note: The V6 engine can occasionally develop minor oil leaks from the camshaft adjuster magnets, which is something a technician can easily spot during a pre-purchase inspection.
Usually the point where suspension bushings and engine mounts might show signs of their age.
A sensible time to ensure the transmission fluid and filter have been serviced for the second time.
Often when auxiliary components like the alternator or water pump might warrant a proactive inspection.
Verify the service book shows regular oil changes using high-quality synthetic lubricants.
Ask if the transmission service has been completed, as this is vital for the 7G-Tronic longevity.
Inspect the brake rotors and pads for even wear to ensure the stopping power remains precise.
Confirm the air suspension (if fitted) holds its height overnight after the car has been parked.
Check that all electrical features, like seat adjustments and infotainment, respond promptly to commands.
Estimated repair costs if issues arise
If the history doesn't confirm a fluid flush, you might eventually need to budget for this to keep the gear changes crisp and the valve body happy.
As these cars clock up the kilometers, you might consider setting aside funds for replacing front control arms or ball joints to maintain that signature Mercedes ride comfort.
For reliability on long road trips, it is common to consider replacing the thermostat and water pump if they haven't been touched, just as a matter of long-term peace of mind.
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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