2000 — 2005
3.2L V6 - C320
Petrol
Check this by turning the steering wheel from lock to lock while stationary; listen for any whining or groaning, as the power steering pumps on these V6 units can show signs of wear as they age.
While driving at a steady speed on the motorway, observe the gear changes closely; if the shifts feel sluggish or hesitant, it's worth noting that these 722.6 transmissions often benefit from fresh fluid and a conductor plate inspection.
During your walk-around, look closely at the lower edges of the doors and the wheel arches for any bubbling paint, as these models can be susceptible to surface rust if they have lived in coastal NZ environments.
Test this by turning the climate control to the hottest and coldest settings; ensure the air transitions smoothly, as the stepper motors in the heater box can occasionally become stuck or noisy over time.
Usually the time to verify the status of the suspension bushings and ball joints, which can start to feel a bit tired on local roads.
A common point where secondary ignition systems, such as coil packs and plugs, should be reviewed to maintain that smooth V6 performance.
Consider having the cooling system components, like the radiator hoses and expansion tank, inspected if they haven't been touched in recent history.
Keep up with regular engine oil changes using high-quality synthetic oil to keep the M112 engine internals happy.
Ensure the transmission fluid has been serviced at some point in its life, even though Mercedes originally called it a lifetime fill.
Regularly clear the plenum chamber (the area under the windscreen) of leaves and debris to prevent water ingress into the cabin electronics.
Periodically check the engine mounts; when they wear, you might notice slightly more vibration coming through the steering wheel at idle.
Use a reputable diagnostic tool to scan the vehicle every six months to catch any minor sensor codes before they become a persistent check engine light.
Estimated repair costs if issues arise
If you notice a slight burning smell after a drive, it is common to consider replacing these seals as they harden over time, letting a little oil drip onto the hot exhaust manifolds.
If the front end feels a bit 'loose' or clunky over bumps, depending on the car's history, you might eventually need to budget for a refresh of the front control arm bushings.
If the car ever drops into 'limp mode,' it is worth noting that the electronic conductor plate inside the transmission is a known item that may require attention in the future.
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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