I had this problem a while back and fitting a new o ring and gasket to the oil retun pipe fixed the leak, mine too was leaking from where the pipe goes into the block, made a right mess too!
The pipe carries oil back into the sump from the turbo, so after the engine has been off for a while there should be no oil in there to spill, I did mine on a cold engine and didn't loose any oil at all.
It really is a dead straight forward job to to, about 45 mins from start to finish.
I got the o ring and gasket from Volvo for about £4.
1 ) Undo the 10mm nut and remove the clamp holding the oil return pipe to the adjacent pipe.
2) Remove to two allen headed bolts (5mm from memory) holding the pipe to the turbo.
4) Wiggle pipe up and out from the hole in the block
5) Fit new o ring around the bottom of the pipe and refit using new green gasket in between pipe and turbo
6) Make a brew and congratulate yourself on an easy job well done
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