Porsche 911 997 — Reliability

997 2005–2008 1 engine

Reliability Summary

Engine M97 — 70/100 ACCEPTABLE
Known Issues 3

Engine in this model

ACCEPTABLE 70

M97

M97 3.6/3.8 Flat-6

Porsche M97 flat-six of the 997.1 Carrera and Carrera S (3.6/3.8) and the 987.1 Boxster S and Cayman...

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Known Issues Across All Engines

Issue Engine Severity Onset
Intermediate shaft (IMS) bearing failure - rarer with the larger 2006+ bearing M97 critical 80,000 km
Bore scoring (cylinder wall scoring), mainly 3.6/3.8 and 3.4 S M97 critical 100,000 km
Rear main seal and IMS cover oil leaks M97 minor —