felt tape is an excellent noise supressant where two parts are just touching - MB used a lot of it where two panels come together like the A pillar trim edges. I think pieces of varying thickness felt tape is mentioned in the service manual to be applied in case of noises.

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2012 BMW X5 (Beef + Granite suspension model)

1995 E300D - The original humming machine (consumed by Flood 2017)
2000 E320 - The evolution (consumed by flood 2017)