> does anyone know how to keep the trunk of a 528e from leaking???

1. Replace the tail light rubber gaskets. Cheap on a five series, mega buck$ on a six :-(
2. Check the radio aerial is tightly fitted. A bead of silicone sealant around the seat may not go amiss.
3. Check the rubber boot (trunk to you) gasket is in good condition and is sitting properly in place.
4. Take out all the removeable trim in the boot and scub in down with mild ammonia based spray on cleaner. Dry in your house for 24 hours.
5. Go to a DIY store and get some calcium carbonate crystals in a plastic moisture trap. This will dry out and residual moisture.
6. There should be two drain holes in the floor of the spare wheel well. Check they aren't blocked.
7. Fives and sixes do seem prone to water condensation in the bootlid. I've never found a cure.

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