Never heard that before Lightwater. Why does silicon cause rust? The material itself or sloppy application?

Did you see we have a new Sydney member on the forum? MY11 SD4 SE Auto

You need to use a non acidic silicone. Most of the silicone at the hardware store are not suitable. When you remove the M10 bolt there is unpainted metal which should be painted first. Procrastination, mankind's greatest labour saving device!

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