I don't think there is one problem, I think there are a number of problems. Some of the ZF transmissions have a specific problem, the solution for which is documented very well by swissfrank on this board. There are also random issues related to various versions of the software (shifting issues, clunks, etc). Then there are the failures reported at relatively low miles, within the warranty period. Beyond that, the transmissions have a specific problem in that they don't last forever. I just don't think that last one is actionable, however.
There is so much discussion of transmission issues that new and prospective owners ask if they should buy a BMW because of the transmission issues. Others have a driveline failure, or engine issue, and immediately assume they need a new transmission. I think we talk about transmissions (and window regulators, and oil separator valves) because much of the rest of the vehicle is so solid that there isn't much to say.
Automatic transmissions have been failing from the day after they were invented. Companies like Aamco, Mr. Transmission, etc, have built an entire industry on the issue. Yet somehow BMW (who doesn't even make transmissions, but just installs transmissions from GM, ZF, etc) should be sued? Under an assumed lifetime warranty approach? Just think what that would do to the price of new cars.
No are wrestle on the transmission issues. I just struggle to see how lawyers and a sense of entitlement on the part of those who own a used car are going to help.
But then, you knew all this and just wanted a debate. Happy to oblige
