I still think its caused mainly by poor design. A friend who runs his own bodyshop said that Mercs were having a lot of corrosion problems on certain cars due to the original metal not being up to standard. I don't know if the bodywork on the Crossfire came from the same source but it seems likely. As I said above older much cheaper cars are not suffering in the same way and I think its P*ss Poor that this relatively expensive car is not better protected. All cars have there faults but this is a bad one - its like being back in the 70's. Rust will devalue your car quicker than anything.