Thread: Diff noise?
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      09-19-2008, 02:27 PM   #33
GregW / Oregon

Drives: 2015 M4 Coupe, 2012 ML350
Join Date: Nov 2005
Location: Lake Oswego, OR

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Diff noise solution

Originally Posted by ericld View Post
Okay - So I have the same issue on my E92 Coupe. It's a "cornering at low speed" situation and I get a rubbing groan sound - sort of a humming. I hear it daily when I turn into a parking place.

I knew it was the diff when I first heard it, but for a few minutes I thought it might be a wheel rubbing in its wheel well. I also wondered if some lug nuts were loose causing a rear wheel to rock up against the interior well wall.

As a group, what have we decided? Let it be or get more diff fluid in the unit?

I have 2700 miles, but it doesn't sound like something that will go away, more likely something that will increase over time. Friction increases, it doesn't go away over time.
I had exactly the same as you describe. Per my post #25 above, the different fluid solved the noise immediately and completely, and I notice no difference in performance. I would recommend it.

Greg Lake Oswego, Oregon, USA
2015 M4 Coupe - Silverstone/Sakhir/CF
2012 ML350