2013 ml350 Transfer Case leak

[Stoneseller]

I took my wifes car in for a check engine light diagnosis and minor B service. It has 32,500 miles. I told the SA there was a slow oil leak somewhere, as I'm seeing a few telltale drops in the garage.

I'm now told the oil is coming from the transfer case, and a new gasket had to be ordered.

I'm curious if this is a common issue. This ML has the enhanced ORP with low range & lockable differentials.

David in MD