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Same issue here on my 2013 E93 335is. When the top is down it's tight as a drum but when up, it rattles over irregular bumps. I've already Gummi Phledge'd every bit of rubber, and Lithium greased every joint. As the OP said, it's more of a rattle and less of a squeak. I am thinking its the big bolt locks in the rear that hold the rear hatch down, but I can't see them when the top is up to inspect. Has anyone successfully cured the metallic rattle?
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