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Originally Posted by JCL
While the transmission durability is likely similar between the GM and BMW versions, the above means that not everything can be extrapolated. That doesn't mean that you shouldn't change your fluid if you want to, but it means that the GM recommendation for 100,000 is simply one more data point, and not an absolute truth.
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I understand that, but given that GM made the transmission internals, and they use that same package in their cars, it does give what they say a lot of weight. I don't think that a reprogrammed shift pattern is going to take the fluid from lasting 100k miles to lasting forever. Whatever you think about that, the high TAN alone from my fluid says it was time to change, despite what BMW says about the fluid not needing to be changed.
Here is a link to my full report:
D67388.pdf - Windows Live