2006 — 2012
3.0L V6 Turbo Diesel (OM642) - GL 320/350 CDI
Diesel
Observe the transmission at low speeds; if you feel harsh shifting or hesitation, it is worth investigating the electronic conductor plate, as these can show wear on units of this age.
Cycle through all suspension height settings via the centre console buttons; ensure the vehicle lifts and lowers smoothly without warning lights, as the Airmatic air struts can occasionally show signs of aging.
While parked, turn the steering wheel lock-to-lock and listen for groans; the power steering pump and rack seals are components that often require inspection on high-mileage examples of this generation.
After a warm-up drive, check the 'V' of the engine valley for signs of oil or residue; the oil cooler seals on the OM642 engine are known to degrade over time and may eventually require attention.
Consider a full transmission fluid and filter flush to maintain longevity.
Usually the time to inspect the air suspension compressors and check for any minor leaks in the air lines.
Keep an eye on the turbocharger actuator and intake manifold swirl flaps, which may reach their functional limit around this mark.
Prioritise high-quality engine oil changes every 10,000km to keep the complex OM642 turbo-diesel system running cleanly.
Ensure the DPF (Diesel Particulate Filter) is functioning correctly by taking the vehicle for occasional long highway runs.
Regularly inspect the condition of the battery and alternator, as these electronics-heavy SUVs are sensitive to voltage drops.
Check all cooling system hoses for brittleness to prevent minor coolant seepage.
Keep the panoramic sunroof drains clear of debris to protect the interior electronics located under the floorboards.
Estimated repair costs if issues arise
As these vehicles feature air suspension, it's common to consider that the rubber bellows or the compressor pump may reach the end of their service life. If this component needs attention in the future, you might eventually need to budget for parts and labour.
This is a known labour-intensive task due to the location of the cooler in the engine valley. Depending on the car's history, you might eventually need to budget for this repair to address potential oil leaks.
The 7G-Tronic transmission is generally robust, but the electronic plate can fail over time. If this needs attention, it requires a diagnostic scan and professional 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