My '07 530xiT with just 15,500 miles on the ODO has had an annoying vibration thru the steering wheel, brake pedal and seat. It's a high frequency vibration similar similar to an electric massager though infinitely more annoying and it persists from idle through till about 10mph when other factors mask it. I dont think it arises from wheels, brakes or suspension since it occurs even when the car is stopped. Moreover, it seems too high a frequency to be from any of those sources. BMW technicians suggested that it's normal for cars with AWD but it's so annoying that it defies logic that BMW could release a car with a characteristic like this. Has anyone else experienced or heard of this?