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Although i have a 135 (N54), I change my oil every 5,000kms (3,100 miles) and roughly measure the old oil using the measurments on the drop pan and its always approx between 6.25-6.5L that comes out. I dont believe the oil level sensor is completely accurate (as mine always shows full on the screen). That being said because the oil is quite fresh I doubt the engine will break it down and burn it in huge quantities. My 2 cents
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