2015 — 2018
3.0L V6 Turbo Diesel (OM642) - G350d
Diesel
Test drive task: Perform a cold start and listen for rattles. | Description: It is worth checking for timing chain tensioner rattle during the initial cold start, as the OM642 engine can show signs of wear in the chain guides as they age.
Test drive task: Shift into low-range and cycle through locking differentials. | Description: The W463 G-Class utilizes complex vacuum-actuated diff locks. It is wise to verify each light on the dashboard illuminates promptly to confirm the system is engaging correctly.
Test drive task: Inspect the 'V' of the engine block from above. | Description: Check for signs of oil leaking from the turbo inlet seal or the oil cooler seals, which are common areas where gaskets may degrade over time on these V6 diesels.
Test drive task: Operate all electrical windows and the sunroof. | Description: The G-Class body is prone to moisture ingress over many years; verifying that all window regulators and electrical modules are operating smoothly is a sensible precaution.
Usually the time to inspect suspension bushings and potential replacement of the turbo inlet seal to prevent oil dripping onto the electronic swirl flap motor.
Often the point where the glow plug control module might require attention, and the transmission fluid should have been refreshed for the second time.
A stage where one might consider a comprehensive cooling system refresh, including the water pump and thermostat, to ensure continued reliability.
Always use the approved Mercedes-Benz specification diesel engine oil to keep the DPF (Diesel Particulate Filter) happy.
Ensure the transmission fluid and filter service is documented every 60,000km to keep the 7G-TRONIC shifting smoothly.
Keep an eye on the battery health, as the complex electronics in the W463 are quite sensitive to voltage drops.
Regularly clear out the sunroof drains and door seals to prevent water accumulation within the cabin structure.
Prioritize a pre-purchase inspection from an independent specialist familiar with the OM642 engine and G-Wagon chassis architecture.
Estimated repair costs if issues arise
If you notice a small oil drip in the engine V-valley, it is often the oil cooler seals reaching the end of their service life. Accessing this is a significant job involving intake manifold removal, so it is best to budget for this if the history doesn't show it has been done.
Depending on how the vehicle has been driven, you might eventually need to budget for DPF cleaning or sensor replacement, particularly if the car has been used primarily for short city trips.
If the ride height seems uneven or the damping feels inconsistent, you might eventually need to budget for the replacement of suspension components as the rubber air bladders or dampers age.
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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