Mercedes-Benz GLC X254 — Reliability

X254 2023–present 1 engine

Reliability Summary

Engine OM656 — 82/100 BUY
Known Issues 3

Engine in this model

BUY 82

OM656

3.0L Diesel I6

Mercedes returned to the straight-six in 2017 (E, S, G, GLE, GLS 300d-450d). Smooth and strong; the ...

View details →

Known Issues Across All Engines

Issue Engine Severity Onset
Coolant pump leaks into vacuum circuit — recall (action 2090008) OM656 high —
DPF + EGR — diesel city driving concern OM656 moderate 60,000 km – 120,000 km
AdBlue / SCR system consumption and faults OM656 minor 30,000 km – ∞