my 1991 940 turbo has an oil leak, as you can see in the picture below:




i tried to tighten up the nuts in the picture, but they seemed tight already. i was wondering if there is an o-ring in there, maybe that is bad. just want to know before i start pulling things apart and running around looking for parts

 

Looks kind of like the o-rings between the cooler and the engine might be leaking.

You would have to remove the cooler to replace. By removing the 2 lines then the Bolt setup holding it to the block.

Is there any oil above the filter assembly?