Recently purchased a used (2013) IS300H. Really enjoying my first Lexus and the IS300H is a pleasure to drive.
The car is generally very quiet. However, I am a little concerned about a 'howling' sort of sound coming from the rear of the car. This is most noticeable when travelling above approx 40/50mph. The sound doesn't sound like a tyre noise, diff whine or failed wheel bearing noise.
As I haven't driven another IS300H, I'm not sure if this noise is 'standard'.
Any advice?