Whats the mileage? How does the engine run? I've seen some on x5s for whatever reason now drop the pan and clean it out during a guide job. Maybe its a good time to pop the valve covers off and check if the guides look newish or at the very least try getting a good look inside the oil cap...

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02 Imola on Black Dinan S2 4.6iS
00 RoyalRot on Sand/Black 740i Short Sport