Mine emits the stink from the exhaust only. Post exhaust is all good including the engine bay. It stinks anytime the engine is running and only from the exhaust end. I also don't have oil consumption issues. I'm wondering if this stink comes from residual oil when the vehicle had leaking valve stem seals and that oil is still gradually burning off . May be I should have thoroughly cleaned up the intake manifold when I did the VSS? But wouldn't burning oil result in smoke?

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'05 E53 X5 4.4i, '97 E39 528, '07 E92 335i, '16 F86 X6M.