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Is there a lot of transmission failure reported with "lifetime" fluid?
I don't think majority of ppl who own BMW care beyond what they are told by dealer or manual.
If the transmission holds up fine without fluid change, it may be ok following what manual says.
For sure, it will be better to change oil regardless but if it is really not necessary, I don't want to mess with it.
Speaking of ZF's requirement, even if it is basically same transmission, requirements can be vary for each applications.
All different companies that uses same transmission would have different maintenance process and requirements, depends on their usage profile and expected life/performance.
Highly likely ZF and BMW have something slightly different from ZF's 'generic' transmission maintenance requirement. They may use different oil.
It would be huge risk for BMW if transmissions fail frequently, even after the warranty period, because it will hurt their image/reputation.
It will never hurt changing oil frequently, but this one seems like not simple drain and fill. If it's done by someone who does no know very well, it may hurt transmission.
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