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Possible differential noise
Hi all,
I was wondering if anyone has experienced the particular sound I'm hearing from my 2006 325xi. Whenever I'm cruising on the highway around 55-60 mph I start to hear a low frequency drone or hum. The noise actually starts to get quieter at 65-70 mph and higher. The problem is that it's very subtle, pretty much only noticeable when I'm on smooth pavement, a/c off, windows up. I was told by the local dealership that the sound was tread noise, but I've just recently had the tires changed and wheels balanced. I had a rear wheel bearing changed as well, but not sure if that has anything to do with the noise. Has anyone heard a sound like this before? Could this be my differentials or transfer case?
The reason I ask is that upon comparison with a slightly newer xdrive 3-series, the loaner car did not exhibit this noise. I'd appreciate any ideas you have.
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