My W115 300D oil cooler line has sprung a leak. I can not for the life of me figure out how to get my hand and a wrench in there to loosen the hose that connects to the oil filter housing. If the battery tray was removable it would be doable but its welding in there, in so many places. That connection is hard to even see not to mention get to by hand with a wrench. From underneath its even less accessible.

Has anyone ever successfully done this?

If I have to remove the motor to get to this fitting, a turbo om617 is going back in instead!