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FWIW:
The service guy at my dealer said that if it was his car, he would not wait for 25,000 kilometers before changing the oil for the first time. He would do it at at 5,000 kilometers (3,000 miles). But not sooner.
He also said not to bother with the transmission or differential oil. He took a sample of his when he bought his bimmer. It was 10 years old at the time and the transmission and differential oils were like new.
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