Mercedes-Benz S-Class W222 — Reliability

W222 2013–2017 1 engine

Reliability Summary

Engine M278 — 62/100 CAUTION
Known Issues 2

Engine in this model

CAUTION 62

M278

M278 4.7 V8 Biturbo

W222 S500, W166 GLE500, W212 E550. Hot-V twin-turbo. Timing chain guides. Turbo oil line leaks. Expe...

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Known Issues Across All Engines

Issue Engine Severity Onset
Timing chain guide failure M278 critical 80,000 km – 150,000 km
Turbo oil line leak M278 high 60,000 km – 120,000 km