I think this level of corrosion is totally unacceptable!
If the extended warranty doesn't cover corrosion...then it should!!........surely this is almost an admittion from BMW that corrosion is expected, and a high risk??
I don't really think this is solely a BMW problem.........I think most modern bikes will disintergrate quickly if used through British winters....especially with this snowy and salty one we've just had!
Unfortunately bikes aren't made to withstand them as modern cars are....and I'm guessing most GS owners are more likely to be riding all year on their bikes, than say, your average R1, Fireblade, or sports bike rider??......and so they will encounter more salt etc, and so be more prone to corrosion?
It is one of those situations where, if you accept it as it is, it will always remain the same.....but if the buyers and owners don't, then the factories will be forced to improve the build quality?
In th 70's Datsun entered the UK car market with affordable cars that were selling well.........unfortunately the Japanese factory had totally underestimated what rain, road salt, and the generaly foul climate of the average European winter would do to the bodywork and chassis of their cars....and as a result they rusted away!!
Since then there has been great advancement in corrosion protection on all cars, with impressive warranties being given on many makes and models..........surely even though a motorbike engine and parts are more open to the elements, we could expect at least a adequate level of protection?
I personally would be well p'd off if after 3 years I was attacking my 'new' 3 year old car with a wire brush, flap wheel and hammerite!.....why should we accept it on our BMW bikes??