One problem related to engine oil leaking has been reported for the 2007 Infiniti G35. The most recently reported issues are listed below.
Car would die after being started. Lag time in accleration. Upon inspection we were told the rear timing cover has a seal inside of it that is broken. The mechanics showed us 4 vehicles in their shop with the same issue. The seal inside this cover is so hard to reach the entire engine must be dropped in order to fix this. It is a $3k+ job. The mechanics advised that until Nissan fixes the quality of this seal it will blow again in 80k. The seal is creating oil leaks into my engine and will eventually lock up the transmission. We were advise there may be a service bulletin on this issue, and a 100,000k extention on the powertrain is in the works. We cannot confirm this yet, as we are waiting for Infiniti to respond. We have always kept up with the suggested maintenance on this vehicle with regular oil changes. We are extremly displeased with the fact that this is an issue that Infiniti is aware of but hasn't fixed yet. We can also confirm that the passenger seat (front) shows that I am not sitting in the car and the airbags turnoff. This fluctuates given the temp outside. We believe this may be an electrical issue.