I changed my oil return line today. Left the Turbo in. the 8mm bolts on the turbo end are easy with a 3/8" drive socket. The Block end however i had to use a 24mm Crowsfoot with 1/2" drive using a extension bar and flex joint. This was only used to crack it and tighten it up again. used Small shifter to do up until you need the Crowsfoot.

Rob