Where are all the members who proclaim "Lifetime" and "don't change it". The silence is deafening.
OP, hope everything turns out ok, but fluid changes normally don't fix problems; they prevent problems from happening.
Edit: The problems you are having might have occurred because of low fluid. Not your fault, there is no dipstick. Let's see if your problem goes away.
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If no codes are being thrown use Chevron Techron fuel injector cleaner (concentrate). It solves rpm fluctuating upon cold start-up. Also, for most BMW problems start off by scanning your car with the Peake Research Tool. It contains the actual BMW codes. If you want to register a newly installed battery for free (just buy a $10 cable) and google/download BMWLogger
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