 I purchased the Q45 in March 2003 and have 16k miles on it now.  It has always been service by Infiniti wihtin the manufacturer specs. When I picked up the car, the front rotors were warped...they cut them. This problem has persisted over the past three years and they simply cut the rotors.  Secondly, the car burns over 1 quart of oil per 1000 miles.  As everyone else has experienced, Infiniti denies there is a problem, states that burning 1 quart per 1000 miles is normal.  If you persist, they will then go through the "consumption test" and will try everything they can EXCEPT FIX THE PROBLEM. It borders on criminal to sell someone a $60K car with these problems and not fix the car.