My 850 turbo has started major oil leak. I thought it might be the infamous rear main seal but the flywheel & ring gear look clean. Then I thought it must be a bad oil pan gasket or crack, so cleaned everything off with a gas soaked rag. Nothing until I rev the engine hard, then I get rapid drips from the larger (return?) oil pipe from the turbo where it enters the engine. It did not seem loose, but I was too cautious to shake it hard. What gives here? I don't see how the return pipe is attached to the motor, it just seems to poke in without a clamp or anything?.