Quote:
Originally Posted by ayao
I'm under the impression that the +FM is used if there is noise coming from the diff, and that once you put FM in there you can't go back to non-FM. My bias would be to just go with non-FM unless I hear bothersome noise. I'd be curious to hear what people think?
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I understand your reasoning, but doesn't it conflict with the service bulletin below?
As I understand it, BMW used to use the FM fluid only as needed, but now it is the standard fluid.
