2017 — 2019
2.0L M274 Petrol - GLC 250 Coupe 4MATIC
Petrol
Listen closely while accelerating from a standstill | Description: Check for any rattling or metallic ticking sounds, as the M274 engine's timing chain tensioner and variable valve timing units can occasionally show signs of wear in higher mileage examples.
Perform a cold start and observe the exhaust | Description: Check for excessive blue smoke, as older M274 engines have been known to occasionally develop valve stem seal leaks or PCV system issues which can lead to oil consumption over time.
Check the transmission during low-speed shifts | Description: Ensure the 9G-TRONIC gearbox transitions smoothly; if you feel harsh engagement between first and second gear, it may indicate a need for a software update or a transmission fluid service.
Test all infotainment and electrical functions | Description: Verify that the screen and COMAND system are responsive, as the C253 interior electronics can occasionally suffer from minor glitches that are often corrected with official Mercedes-Benz software patches.
Recommended interval for transmission fluid and filter change to ensure the 9G-TRONIC stays responsive.
Consider having the spark plugs and engine air filters inspected, as this keeps the M274 turbocharger running at peak efficiency.
A common point to check the condition of engine and transmission mounts, which can start to show age-related vibration.
Prioritise a full service history specifically from a Mercedes-Benz specialist to ensure the correct specification engine oil has been used.
Ensure the panoramic sunroof tracks, if fitted, are kept clean and lubricated to prevent creaks or binding.
Regularly inspect the condition of the brake discs and pads, as the GLC's weight can lead to faster wear than a standard sedan.
Confirm the air conditioning system is blowing cold, as the refrigerant charge can dissipate slightly over several years.
Keep an eye on tyre wear patterns to ensure the 4MATIC system and suspension geometry are perfectly aligned.
Estimated repair costs if issues arise
In cars of this age, it is worth keeping an eye on the cooling system as the plastic components in the housing can become brittle over time. If this requires attention in the future, the job involves replacing the unit to maintain optimal engine temperature.
Depending on the car's history, you might eventually need to budget for the maintenance of the air struts. If the car begins to sag after sitting, it is a sign that the air bellows may need replacement.
While usually reliable, the wastegate actuator on the M274 engine can occasionally stick as the vehicle reaches higher kilometres. If you notice a loss of boost pressure, it is common to consider a professional diagnostic check.
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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