Mercedes-Benz C-Class W203 — Reliability

W203 2002–2005 1 engine

Reliability Summary

Engine OM612 — 92/100 BEST
Known Issues 2

Engine in this model

BEST 92

OM612

OM612 2.7 CDI I5

Smooth, torquey 2.7 five-cylinder common-rail diesel (1999-2006): E 270 CDI W210/W211, C 270 CDI W20...

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Known Issues Across All Engines

Issue Engine Severity Onset
Injector seal leak (Black Death) OM612 moderate —
Turbocharger wear at high mileage OM612 minor 209,000 km – 322,000 km