I recently had an oil change carried out on my 2008 diesel BMW 3 Series by a non-franchised garage. I have a BMW warranty that I pay for on a monthly basis, but I have discovered AFTER the oil service that the warranty stipulates that all servicing must be carried out by a BMW dealer or one of their approved service agents using genuine BMW parts. An error on my part admittedly, however in my defence I was of the impression that you could no longer be forced to use franchised dealer facilities provided that parts used were to manufacturers specification. Am I now in a position where I must cancel my BMW warranty and go somewhere else?