Good afternoon all. I have a 2011 GL550 and I have been noticing small amounts of oil on the driveway. I degreased and hosed down the transfer case today and see there is a leak coming from the bottom. I will attach pics. Does anyone know how big of a job this is? Can the bolts be retightened? Another fix perhaps? Thanks in advance.

This drip came after being degreased after a few minutes of driving and then sitting.

 

When you ask if it is a big job, that is very subjective. the transfer case is fairly simple. Gears, chain, oil, seals, and case itself. if you have mechanical know-how, it is simple. You should know if you have mechanical know-how or not. The tranfer case is basically a remove and replace item. once you get it removed, just change the seals.

 

This looks like the leaking input seal of the transfer case. Check out this thread:

How-to Rebuild Mercedes ITC Transfer Case