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Discussion Starter #1 (Edited)
I noticed some greasy residue on the front right wheel, pulled the rim off and found this on the hub and inside portion of the rim.

My first thought (it being amber colored) was brake fluid, but fluid level in the reservoir is unchanged, and no residue trail between the caliper/brake line and the hub.

Where else could I check for the source of this leak?

Thanks, as always.
 

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Has the vehicle been sitting for an extended period of time?

When were the wheel bearings re-packed last?

To me it appears that this is the oil that separates from grease that has broken down either due to time, or lack of use.
 

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According to Mercedes it's important to use the approved grease and in the proper quantity. The plastic cans have the proper amount, If they did it wrong it will leak.
 
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