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For the guys who think it's the sunscreen> My X5M rattled like crazy from the back (especially when going over a bump) and I put my friend in the back seat to see if he could tell where the thump noise (rattling noise) was coming from. He thought it was the trunk cover that was making the noise, but it wasn't. The latch on the trunk when it closes slides into the lock on the bottom of the trunk. The lock needed tape put around it to keep the trunk door fastened securely and no more noise. I don't know if this is what's causing noises in the M5 but it might be worth a try.
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