[CharlesStevenson]

GTMaster, you make an interesting point, so let's ask - why do the rear wheel arches rust?

Since the same galvanised metal was used throughout, why is that most/the worst rust occurs around the wheel arches?

Even if there's a lot of wet mud thrown up into the wheelarches, that's what happens to my 740 and it's not rusting whatsoever.

Most rust I've seen had commenced from within the wheelarch, rather than untreated parking damage or scratches etc.

I know that some other cars have had problems with joins that haven't been properly treated or where corrosion has been caused by materials touching or even materials absorbing water (especially in a Japanese car such as the Toyota MR2, for example) but I don't know why it occurs on the 4xx range.

Any USEFUL comments anyone?