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Originally Posted by Terp335
Not enough miles on the n63tu to tell if it's got the same issues. The recent bulletin issued by BMW requiring a battery change at each oil change interval applied to both engines though (n63 and n63tu).
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And also the X5 with N55 35i and N57 35d require the same battery change interval as well. Something to do with BMW's efficient dynamic charging of the battery in all their recent engines may not fully charge the battery under certain driving conditions...