2006 — 2012
3.0L V6 Turbo Diesel (OM642) - GL320 CDI/GL350 CDI
Diesel
Observe the transmission shifting when cold. It is common to consider that these 7G-Tronic gearboxes may develop harsh shifting as they age, often linked to the conductor plate.
Inspect the underside for air suspension leaks. Before starting, check if the car sits level; if it drops overnight, it is worth investigating the air struts or compressor condition.
Listen for a 'rattle' at startup. It is worth noting that the OM642 engine timing chain components are robust, but a short rattle can occasionally indicate the need to check tensioner health.
Evaluate the engine under load for oil leaks. It is common to inspect the 'V' of the engine specifically for signs of oil leaking from the turbo intake seal, which can drip onto the swirl motor linkage below.
Usually the time to evaluate the health of the suspension air bags and compressor relay.
A common point where the transmission fluid and filter service is essential if not recently performed.
Typically when the DPF (Diesel Particulate Filter) may require professional cleaning or monitoring.
Prioritise an engine oil change every 10,000km using MB-approved low-ash oil to protect the DPF.
Keep an eye on the coolant reservoir for any signs of discolouration that might hint at oil cooler seal wear.
Ensure the transmission fluid is changed regularly to help maintain smooth gear changes.
Periodically clear the drainage channels near the windscreen to prevent moisture from reaching the cabin electronics.
Use a high-quality battery, as these vehicles rely heavily on stable voltage to keep the complex electronics happy.
Estimated repair costs if issues arise
Future Budget Planning: These components have a finite lifespan. If this system needs attention in the future, the estimated cost in NZ reflects the complexity of the self-levelling system.
Future Budget Planning: This is a labour-intensive job involving the 'V' of the engine. Depending on the car's history, you might eventually need to budget for this if you notice oil seepage.
Future Budget Planning: If the transmission begins behaving erratically, it is common to consider that the electronic conductor plate may require replacement.
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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