Injection pump leaking oil?!

[BenzTurbo]

I have a 1982 300sd with about 180,000 miles on it. I have removed the ALDA, EGR vac mess, ect. It looks like the injection pump was rebuilt at one time because there are yellow marks on the screws and bolts. The car runs great, it has a good amount of blow by but there are no fuel delivery issues. My main concern is what looks like engine oil leaking from the pump itself! Is it engine oil? If not i dont want it to run out of its oil! It leaks enough to make a mess after 50 miles to mark its territory when you park it. It appears to leak from the ALDA area, top cover plate, and some of the side service ports (not sure of the proper names). Maybe if it was rebuilt they used bad O rings and gaskets? Any help is appreciated!