Really hard to tell anything with that recording but hissing sound could be an exhaust leak in combination with a blocked cat or a vacuum leak, maybe even at the pan gasket since the crankcase is under vacuum and looks like you some oil leaks. Maybe try tracing sound with a piece of rubber hose held to your ear.
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1988 325is (purchased new) sold
2004 X5 3.0 2005 X3 2.5
2008 X5 3.0 (new to me)
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