2018 — 2020
3.0L OM642 DE30 LA V6 Turbo Diesel (X 350 d) - 190kW 4MATIC
Diesel
Check the steering wheel and pedals for vibration at 80-100km/h; some examples may experience wheel balancing sensitivity common in heavy-duty utility platforms.
Before turning the engine over, inspect the engine bay for any signs of oil seepage around the turbocharger intake pipes; the OM642 engine is known to occasionally develop minor seal leaks over time.
While accelerating steadily at lower speeds, check for any hesitant shifting or 'shuddering' from the 7G-TRONIC transmission; these units occasionally benefit from timely software updates.
While parked on an incline, test the parking brake engagement and ensure it holds the vehicle firmly; ensure the mechanism feels consistent and responsive.
Consider a full transmission fluid and filter service to ensure the longevity of the 4MATIC drivetrain.
It is wise to inspect the DPF (Diesel Particulate Filter) pressure sensors and cooling system hoses as a preventative measure.
Evaluate the condition of the suspension bushings and dampers, as these components work hard under New Zealand road conditions.
Prioritise oil changes every 10,000-15,000km using the specific Mercedes-Benz approved low-ash synthetic oil for the OM642.
Ensure the AdBlue tank is topped up regularly, as a dry system may prevent the vehicle from starting.
Check the cabin air filter every service, especially if you drive on gravel roads, to keep your air conditioning system breathing freely.
Keep a close eye on the front CV joint boots for any cracks or grease leaks during your routine warrant inspections.
Ensure the intercooler pipes are cleaned or inspected for any oil buildup that can accumulate over long durations.
Estimated repair costs if issues arise
If this component needs attention in the future, the estimated cost in NZ is reflective of the complex sensor arrays and potential filter cleaning or replacement required for the V6 diesel system.
Depending on the car's history, you might eventually need to budget for a comprehensive transmission service to keep those smooth shifts consistent as the vehicle ages.
Because the X-Class is a robust workhorse, you may eventually need to budget for replacing worn suspension bushings to maintain that premium ride comfort on Kiwi roads.
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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