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G30 530e here and I've been using the normal maintenance intervals and let the car decide. The first oil change was around 32 000 kms (or 20 000 miles). I had it done as soon as the car requested service, so would have been good for another 2000 kms according to the car.
I've driven 53 000 kms so far and the car estimates next service in 14 000 kms.
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