No. I think what he was alluding to is the whistling automatics. It
seems to happen after the filter is replaced with an aftermarket one.
But the problem isn't actually the filter. It's the aftermarket o-ring
that comes with the filter. After folks replace the o-ring with an OE
BMW one, even the aftermarket filters are quiet.
Are you sure that the noise is coming from the transmission? What makes
you think so?
A very common E60 problem is an intake manifold vacuum leak. It will
whistle, but only when cold until the parts expand and reseal the
intake. Usually this is accompanied by check engine codes indicating
"lambda sensor out of range", only at idle and only when cold.
It's a sizeable job to remove the intake manifold and replace all the
rubber gaskets and most people replace the PCV Plate at the same time.
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