2009 — 2011
ML350 CDI 3.0L V6
Diesel
Check the suspension air bags: Park the vehicle on level ground and measure the height of each wheel arch. Leave it overnight if possible to see if the car sags significantly on one corner, which might indicate a leaking air strut.
Monitor the transmission shift quality: While driving at low speeds and during steady acceleration, feel for any harsh gear changes or 'flare' between shifts, as the 7G-Tronic gearbox can develop valve body or conductor plate sensitivities as these models age.
Inspect the V-bank area for leaks: Use a torch to look down into the valley of the engine (near the oil cooler) for any signs of oil pooling or residue, as the seals in this area can harden over time.
Test the electrical systems: Cycle through the COMAND infotainment system, heated seats, and sunroof operation, as water ingress through the tail light seals or sunroof drains can sometimes affect the rear SAM (Signal Acquisition Module).
Time to inspect suspension bushes and ball joints for perishing.
Often the stage where glow plug modules and relay systems may require a health check.
A common interval to ensure the turbocharger actuator and intake swirl flap linkages are operating smoothly.
Ensure the transmission fluid and filter have been changed at least once in the last 60,000km.
Regularly clear the sunroof and plenum chamber drainage tubes to prevent cabin water damage.
Use only high-quality Euro-spec engine oil to keep the complex DPF and EGR systems happy.
Keep an eye on the coolant condition to prevent potential corrosion of the engine heat exchangers.
Verify that the battery is healthy, as these electronics-heavy models are sensitive to low voltage.
Estimated repair costs if issues arise
If you notice the vehicle sinking, you might eventually need to budget for replacement air struts or the compressor pump, which keeps the ride height correct.
Because the oil cooler is tucked deep in the engine V, the labour to access and reseal it is significant; keep this in mind for long-term maintenance planning.
Depending on the car's history, you might eventually need to budget for a repair of the transmission control electronics if shifting becomes inconsistent.
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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