Hi folks, what I have: 2013 Model S 85 Issue: My car produces a high pitch whine noise from the drive unit. it gets louder as speed increases. Tesla service center: As I showed up for my Tesla appt. this morning, I told them about the noise and service advisor sat in the back seat of my car. After driving for one block at max speed @ 45 MPH, he told me to go back to the service center. Shortest diagnostics ever! LOL. 8 years DU & battery Warranty: Immediately after the test drive, Tesla sales rep. informed me that Tesla will replace my DU at no cost. Question: Will Tesla replace my DU with newer more efficient DU as stated in this article? Tesla shows off Model S & X's high-efficiency drive units, adaptive suspension UI I will ask them when I pick up the car tomorrow but just want to hear your thought..