Well said, Jim Smith!
I had the good fortune of replacing the oil cooler hoses on my 240D a few months back.

Yes it was difficult but I eventually got them in. It's all by trial and error. One thing that I did do is cut the cold rubber hoses to let all the oil out of them before I even tackled the job because I knew it would be messy if I didn't cut them.
Herb
'82 240D
'87 300SDL
'92 300D 2.5 Turbo