2.2 Cavity preservation of aluminum parts
WARNING: This page is about a different car, the 2013 BMW X5 M, 2012 BMW X5 M, 2011 BMW X5 M, and 2010 BMW X5 M. However, it is still accessible from the selected car via links, so may be relevant.
New doors, lids and side panels made of aluminum are not sealed with cavity protection agent.
After all straightening work on aluminum components, the cavities affected must be sealed with cavity protection agent after being painted.
After all welding work (E52 only) on aluminum components, the cavities affected must be sealed with cavity protection agent after being painted.
Cavities, seams and folds formed from new sheet-metal parts must be sealed with cavity protection agent after being painted.