The engine has been well cared for by me for the last 9 yrs , it must be approaching 450 k ,daily driven between three other w123s , always chasin oil leaks and like to be thorough but this seems to be a block leak , I cleaned that side when I had the turbo , will have to exit the turbo again to really get a look , it’s a super slow drip wherever it’s coming from , won’t be satisfied till I ring out , a little grimlin leak .