Mercedes-Benz SLK R171 — Reliability

R171 2005–2008 1 engine

Reliability Summary

Engine M272 — 50/100 CAUTION
Known Issues 3

Engine in this model

CAUTION 50

M272

V6 NA 2.5-3.5L

Smooth V6. Early models: balance shaft defect (class-action). Post-2008: better.

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Known Issues Across All Engines

Issue Engine Severity Onset
Balance shaft sprocket wear — class-action M272 critical 60,000 km – 150,000 km
Intake manifold swirl flaps failure M272 moderate 80,000 km – 150,000 km
Spark plugs + ignition coils M272 minor 80,000 km – 150,000 km