W115 1975 Mercedes 300d excessive oil consumption

[IM75300d]

Hello all, nice to meet you all. I’m pretty new to the group and recently picked up a 1975 Mercedes 300d.

It has been going through quite a bit of oil, about half a quart every 100 - 150 miles, and the oil seems pretty thin and smells like diesel. I had been reading in the threads and thought maybe the injector pump might need new oil, but it looks like the 300d injector pump shares oil with the engine. Again kinda lost at this point so any help would be much appreciated!!!