Our x5 5.0i also drank oil at regular 3000 mile intervals until about 10k miles. Currently have 25k miles and now I go about 6000-7500 miles before needing more oil. Dealer said its normal for the TTV8's to use quite bit of oil. I would only be concerned if you still need oil at less than 2500 miles intervals when you have around 10,000 miles.
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