One problem related to engine grinding noise has been reported for the 2006 Infiniti G35. The most recently reported issues are listed below.
Engine consumes 2. 5 qrts oil every 800 miles & only 19-20 miles per gal gas and this decreases with oil consumption. Clutch assy faulty/ grinding noise increased with mileage ,windows have binding noise up/down, passenger air bag light does not illuminate when seat is occupied or unoccupied.