Re: Is there one cause for all these FD failures?
I think I understand where you're coming from. Seems, though, that if the original bearings were replaced with another mfg., than back again, and still the failures, the bearings themselves are likely not the problem. I'm betting that BMW has the info. With all the data, including the VIN of each vehicle worked on by an authorized BMW dealer/service center, BMW knows where each was assembled. If we had that same info, we would have one more piece of the puzzle. For now I'm leaning toward the lube, and still playing with boundary lubrication properties of various gear oils. Now my tests are no more scientific than anyone's ability to build a better bearing, but it does get interesting. So far I've only tested Lucas, ******, and Schaeffer's, but I'll be buying more to continue the testing. At the very least, I think the better lube will get me a couple of extra miles.