One problem related to engine rattling and whining sounds has been reported for the 2006 Infiniti G35. The most recently reported issues are listed below.
When my leased 06' G35 coupe hit around 6,000 miles it started making a rattling sound from under the hood. When I brought the car to the dealership to be checked on they advised me that my engine was consuming too much oil & that the engine would have to be replaced. They replaced the engine but than at around 7,000 miles the same noise came back. I have been to the dealership 4 times in the last 3 months and everytime I go back the car is 2-3 qrts oil low. The problem is that the engine that they replaced my old engine with has the same issue & it will continue to happen unless I am given a new manufactured engine - which seems to be unavailable. This is a major safety concern for my family & I want them to take back the vehicle or provide me with a new engine. I have complained to Infiniti consumer affairs who are aware of the situation but I feel I am getting nowhere. Ininiti consumer affairs states that the case is being researched. This is unacceptable for a leased vehicle & it needs to be addressed.