I have a 2016 F800GT that just turned 25K and noticed that BMW recommends a belt replacement every 24K to the tune of $500 plus labor! This, to me, is outrageous! How can other manufacturers fit their machines with belts that last twice that long and even more and BMW cannot? I also discovered that their are NO aftermarket belt replacements on the internet. So, what gives? Has anyone used their original belt for 30K, 40K or more without failure? I would like to know because I, for one, do not intend to replace my belt every two years (12K per year) for that kind of money! Input and advice would be appreciated...