2019 — 2022
2.0L OM654 Diesel - GLC 300 d 4MATIC
Diesel
While on a flat road, take your hands lightly off the wheel (safely) to check for steering drift. | Note: Some X253 models with high-mileage suspension components may show signs of alignment wear or bushing fatigue.
During the test drive, shift from Park to Reverse and Drive while stationary. | Note: Listen closely for any hesitant engagement or 'clunking' from the 9G-TRONIC transmission; smooth transitions are key to the health of the gearbox.
Park on a clean patch of concrete for five minutes after your drive. | Note: Inspect for any fluid drips. While the OM654 is generally robust, checking for oil seepage around the cooling housing or sensors is wise.
Operate the infotainment screen and all steering wheel touch-capacitive buttons. | Note: Verify the responsiveness of the MBUX system, as complex electrical gremlins can sometimes arise in these units as the vehicle ages.
Check the water pump and auxiliary drive belts for signs of wear.
Consider replacing transmission fluid and filter to maintain smooth shifting.
Monitor DPF (Diesel Particulate Filter) health and ensure regular long-distance drives to facilitate regeneration.
Verify the service history specifically for AdBlue system health, as these sensors require clean fluid.
Check that the panoramic sunroof seals are clean and lubricated to prevent wind noise or drainage blockages.
Ensure all software recalls have been addressed by a Mercedes-Benz specialist or dealer.
Keep a close watch on your tyre pressure; the GLC 300d can be sensitive to uneven wear if pressures aren't perfectly balanced.
Prioritize using high-quality diesel fuel to keep the sophisticated OM654 fuel injection system operating at its peak.
Estimated repair costs if issues arise
If the vehicle is equipped with Air Body Control, eventually the bags or compressor may require servicing. It is wise to have a reserve for this to maintain that signature smooth ride.
Diesel engines rely on complex sensor arrays for emissions. Depending on the car's history of short-trip driving, you might eventually need to budget for a professional DPF clean or sensor replacement.
Periodic servicing of the 9G-TRONIC transmission is essential for longevity. It is common to consider this as a preventative cost to ensure the gearbox remains responsive.
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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