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This is the dilemma for every BMW owner out there actually....or every owner to cares about their car. I had the same issue with my X5, there are 3 capacity batteries that will fit, 90, 92, 105. In theory, you want the largest one, the 105.
When I took it to the dealer, they said they recommend sticking to the same battery that the car was equipped with. Mine was already the 105 from the factory, so they gave me a 105. I would advise you ask this question to the dealer.
And yes, you'll need to get the battery coded eventually. Your timing is actually good right now. During the winter, the dealership runs a mail-in-rebate program for battery installs and it's about the same price as buying an OEM battery and paying an indy code it for you. That's what I did, I wanted the piece of mind that the coding was going to get done right.
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