Porsche 911 996 — Reliability

996 1998–2001 1 engine

Reliability Summary

Engine M96 — 49/100 CAUTION
Known Issues 5

Engine in this model

CAUTION 49

M96

M96 2.5-3.6 Flat-6 (986 Boxster, 996 Carrera)

The first water-cooled Porsche flat-six, used in the 986 Boxster (2.5/2.7/3.2) and 996 Carrera (3.4/...

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Known Issues Across All Engines

Issue Engine Severity Onset
Cracked or slipped cylinder liners and D-chunk cracks (early 996, 3.4) M96 critical —
IMS bearing failure (single-row bearing 2000-2005 worst) M96 critical 80,000 km
Bore scoring (Lokasil cylinder walls) M96 high —
Rear main seal oil leak M96 moderate —
Air-oil separator failure - smoke and oil consumption M96 minor 160,000 km