I'm trying to pinpoint an oil leak on my 1994 E320 wagon. I was underneath the car last night and noticed that the elbow hose that connects to the rear of the air pump is drenched with oil. I'm pretty sure it is this hose: https://www.pelicanparts.com/more_info/104-141-12-83-mbz.htm

Is there any reason this hose would be leaking oil? Or is it likely that the oil is dripping off of the front corner of the head directly above and covering it in oil?

I assume its the latter but was hoping someone could confirm.

thanks