Getting ready to make some offers on 05/06 CDIs...

My Only MB diesel was 84 300sd-- Great car-- Let it go- w/275k-- leaking TOO much oil (wish I was more patient)

Will this OM648 leak as much (w/ 220k + miles)--as the 617? Or did MB get better/designs/gaskets/etc.

some- always throw out-- "All diesels leak oil" - don't know if I buy that

Just want to know what I am about to get into