Quote:
Originally Posted by biglare
Yes, please see the red arrows in picture below that shows the black plastic stoppers that needed to be adjusted. Just give them a half turn (counter clockwise) and check to see if tailgate is more secure. Only a half turn has solved our tailgate rattle issues! 
*Note: the picture is not of my X3, but the same parts are on the X3.
I hope this helps for your tailgate rattle issue as it helped me!
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The dealer adjusted these two knobs. It helped but not 100%. Use pliers to turn about max 1/4 turn max , trial & error. Clockwise to tighten. Counter clockwise to make rubber stopper to come out/raise. The adjustments will move the lid further or closer to trunk body. Ideally the lid should be flush with body, reference point was the bottom of lid on RHS & LHS.
He stressed salt makes it worse, always wipe the rubber seals with soap & water, can use a little silicon, not too much. Do not use alcohol. For winter some forum members use Gummi-Pflege. Established German company, I have used their products for aluminum and exhaust tips. I will order Gummi-Pflege.
http://www.autosol.com/ProductDetail...oductCode=6501