Thanks guys. I'm the type of person that avoids the dealer at all costs, but I'm considering doing it for this operation. My Dad's e60 has all kinds of electrical problems, who knows how many, or if any, have been related to the battery, but still.
Also, an * to the comment that all BMW's are sensitive to batteries... I would counter by saying all newer BMW's that could be true. I've only ever run aftermarket batteries in my e39 with no problems and typically a solid 5+ years of use.
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