Need help identifying part please, on my 76 280C.
 

On the driver's side underneath the intake manifold, there's a plastic pipe about an inch wide that goes along the side of the motor from the front to the back and then it turns up.
This pipe is leaking oil from the back junction, right unto the front of the trans housing. Is this an oil return line if so, where do I get/find, how do I fix or replace (part Number?) it?

Thanks in advance.

Been a long time since I looked at one of those but I'm thinking that's an oil return line.

I agree, it´s the oil return line, I don´t know if you can find it anywhere else but the dealer. you will need to heat it on each end to soften it enough to install. It´s hard plastic, so use a hair dryer.

76 280c oil return pipe
 

type in Mercedes-benz\ iauto.it this site has all kinds of diagrams and part numbers good luck