Wasn't sure if I should put this here or in the motorcycle section. This is in reference to what some consider a weak link in the BMW motorcycle line-up......the final drive. The % is probably small but the end results can be dramatic if you were unfortunate enough to have this problem. While I can't identify the source of the failures, they end up spilling their volume of gear oil, ususally with severe over heating. Seems the majority of the failures are bearing related. I have an 04 R1150RT and the specs call for a 90 wt GL5. The dealers I've been too in Texas sell the BMW branded 75/140 synthetic and I'm guessing because of the heat here and possibly to help with the failures. I have noticed (I've had 2 BMW's) the 1st dump of the factory fill showed the fluid to be quite black which makes me think moly was added at the factory. Thus my question, will ~4% of this moly additive help? Some members on boards I visit say yes.