Rudy I just took my car from Bmw service.They said that I have to change transfer oil and transfer nexus.If noise remains I have to change the transfer case.They want 6000euros for the case.That's a serious problem I think.I bought this car two months ago from a car shop in Germany with two years guarantee.I'm in Greece now.Anyone knows if I could do anything with the guarantee.I don't know what to do.Any help???