The most frequently mentioned issue when buying a used Mercedes-Benz GLB 180d 8G-DCT 2025: carbon buildup in the EGR and intake manifold. Also, high oil consumption and leaks from the oil separator are commonly reported.
Be cautious
Most reported issue: Carbon buildup in EGR and intake manifold. Service history and a test drive matter.
Listed from most frequently reported, each with its source.
Modern diesel engines (including OM654) can accumulate significant carbon deposits in the EGR system and intake manifolds, reducing their effectiveness. This can cause rough running, worsening fuel consumption, and loss of engine response.
Engine Internal
Some technical reports for the OM654 indicate higher than expected oil consumption or oil traces in turbocharger pipes due to leaks in the oil vapor separator/crankcase ventilation. This can lead to oily residue in the intercooler and intake ducts, reducing performance.
Engine Internal
Some vehicles with SCR (AdBlue) report warnings related to NOx sensors, crystallization in the AdBlue injector, or pump/dosing unit failures; this can lead to error messages and power limitation.
Exhaust Emissions
The DPF can clog, especially during short city trips, preventing complete regenerations.
Exhaust Emissions
Owners report issues such as actuator problems, play in rotating parts, or oil leaks into the intake circuit; this can lead to loss of boost pressure, smoke from the intake, or reduced performance.
Turbo
Same trim, different year
We only publish claims we can verify. Cards come from European fault records and owner reports matched to this vehicle on brand, fuel, engine and generation.