One problem related to power train has been reported for the 2010 Infiniti G37. The most recently reported issues are listed below.
As with innumerable owners of this 6 speed manual transmission (6mt), I am consistently experiencing a grinding and crunching sound/feeling when shifting into 5th gear at normal speeds. Unless I very slowly (granny shift) or double clutch, this grinding/crunching sound will be heard and felt. According to web searches, this transmission damaging issue has been reported by many other customers and acknowledged/repaired by Infiniti under warranty when customer is persistent.