I bought at a new P85D on June 25, 2015. I absolutely love this car. The car has been perfect accept for a very nasty noise on acceleration. The noise is intermittent but getting worse. It is definitely getting much louder. It sounds mechanical and coming from the front of the car. It is most noticeable after parking the car for a few minutes or more. The noise is present only under hard acceleration. After a few events the noise diminishes and nearly goes away. It is apparent at all acceleration speeds but more noticeable from low speed under hard acceleration. And more noticeable under load especially going up a hill. Tesla replaced both front axles twice but the noise is always the same. The work had no impact on the noise at all. No noise at steady speeds. No noise under deceleration/regen. Noise seems to be coming from the front of the car. The noise is independent of outside air temperature. It's bad in summer or winter. The noise is not affected by the level of battery charge. The frequency of the sound is some what related to the acceleration. In other words it groans faster with the increasing speed. I uploaded the noise from my phone recording at: http://www.obsessiontelescopes.com/tesla/video-1.mov If anyone knows what is causing this noise, myself and the Tesla mechanics at the Highland Park Chicago store would love to know!