Mercedes-Benz C 300 W205 — Reliability

W205 Sedan Mid 2014–2021 1 engine

Reliability Summary

Engine M274 — 72/100 ACCEPTABLE
Known Issues 3

Engine in this model

ACCEPTABLE 72

M274

2.0L Turbo I4

Improved over M271. Dual-row chain. Thermostat main issue. Reliable with care.

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Known Issues Across All Engines

Issue Engine Severity Onset
Oil consumption — piston ring design (early units) M274 high 60,000 km – 120,000 km
Thermostat failure M274 moderate 60,000 km – 130,000 km
Camshaft adjuster / actuator noise M274 moderate 80,000 km – 160,000 km