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Q: large oil leak, especially on hwy trips. where could it be on 2001 Volvo S80

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replaced oil trap, broken eng torque rod. checked drain plug, stick, filter. checked all pan screws. some oil on engine side, most on pan and where trans/eng come together. tried some rear main sealer. helped some. stopped on short trips but not longer ones. and ideas. have not removed oil pan.
(1) Answer
I WOULD LOOK INTO THE ENGINE REAR MAIN SEAL ,TRANSMISSION WOULD HAVE TO BE REMOVED FOR THIS REPAIR. AND IF ITS A TURBO .INSPECT THE TURBO OIL RETURN TUBE SEALS AND GASKETS.