Does the N57 even have a dipstick in the F10? I've just been keeping an eye on the electric dipstick.
Officially no and there is no section in the manual on checking the oil using the engine bay. The way to check oil is through iDrive.
However if you look down the side of the engine you will find it DOES have a dipstick, but it's hidden out of view a bit and the pull ring is black not orange/red in the earlier models.